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  • 1
    Publication Date: 2009-12-23
    Description: Reprogramming of somatic cell nuclei to yield induced pluripotent stem (iPS) cells makes possible derivation of patient-specific stem cells for regenerative medicine. However, iPS cell generation is asynchronous and slow (2-3 weeks), the frequency is low (〈0.1%), and DNA demethylation constitutes a bottleneck. To determine regulatory mechanisms involved in reprogramming, we generated interspecies heterokaryons (fused mouse embryonic stem (ES) cells and human fibroblasts) that induce reprogramming synchronously, frequently and fast. Here we show that reprogramming towards pluripotency in single heterokaryons is initiated without cell division or DNA replication, rapidly (1 day) and efficiently (70%). Short interfering RNA (siRNA)-mediated knockdown showed that activation-induced cytidine deaminase (AID, also known as AICDA) is required for promoter demethylation and induction of OCT4 (also known as POU5F1) and NANOG gene expression. AID protein bound silent methylated OCT4 and NANOG promoters in fibroblasts, but not active demethylated promoters in ES cells. These data provide new evidence that mammalian AID is required for active DNA demethylation and initiation of nuclear reprogramming towards pluripotency in human somatic cells.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2906123/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2906123/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bhutani, Nidhi -- Brady, Jennifer J -- Damian, Mara -- Sacco, Alessandra -- Corbel, Stephane Y -- Blau, Helen M -- AG009521/AG/NIA NIH HHS/ -- AG024987/AG/NIA NIH HHS/ -- AI007328/AI/NIAID NIH HHS/ -- R01 AG009521/AG/NIA NIH HHS/ -- R01 AG009521-25/AG/NIA NIH HHS/ -- R01 AG024987/AG/NIA NIH HHS/ -- R01 AG024987-05/AG/NIA NIH HHS/ -- T32 AI007328/AI/NIAID NIH HHS/ -- U01 HL100397/HL/NHLBI NIH HHS/ -- England -- Nature. 2010 Feb 25;463(7284):1042-7. doi: 10.1038/nature08752.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Baxter Laboratory for Stem Cell Biology, Institute for Stem Cell Biology and Regenerative Medicine, Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California 94305-5175, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20027182" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Division ; Cell Fusion ; Cell Line ; Cells, Cultured ; Cellular Reprogramming/genetics/*physiology ; Chromatin Immunoprecipitation ; Cytidine Deaminase/deficiency/genetics/*metabolism ; DNA/chemistry/genetics/metabolism ; *DNA Methylation ; DNA Replication ; Embryonic Stem Cells/cytology/metabolism ; Fibroblasts/cytology/metabolism ; Gene Expression Regulation ; Gene Knockdown Techniques ; Homeodomain Proteins/genetics ; Humans ; Induced Pluripotent Stem Cells/*cytology/enzymology/*metabolism ; Lung/cytology/embryology ; Mice ; Models, Biological ; Octamer Transcription Factor-3/genetics ; Promoter Regions, Genetic/genetics ; Time Factors
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  • 2
    Publication Date: 2009-12-18
    Description: All cancers carry somatic mutations. A subset of these somatic alterations, termed driver mutations, confer selective growth advantage and are implicated in cancer development, whereas the remainder are passengers. Here we have sequenced the genomes of a malignant melanoma and a lymphoblastoid cell line from the same person, providing the first comprehensive catalogue of somatic mutations from an individual cancer. The catalogue provides remarkable insights into the forces that have shaped this cancer genome. The dominant mutational signature reflects DNA damage due to ultraviolet light exposure, a known risk factor for malignant melanoma, whereas the uneven distribution of mutations across the genome, with a lower prevalence in gene footprints, indicates that DNA repair has been preferentially deployed towards transcribed regions. The results illustrate the power of a cancer genome sequence to reveal traces of the DNA damage, repair, mutation and selection processes that were operative years before the cancer became symptomatic.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3145108/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3145108/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pleasance, Erin D -- Cheetham, R Keira -- Stephens, Philip J -- McBride, David J -- Humphray, Sean J -- Greenman, Chris D -- Varela, Ignacio -- Lin, Meng-Lay -- Ordonez, Gonzalo R -- Bignell, Graham R -- Ye, Kai -- Alipaz, Julie -- Bauer, Markus J -- Beare, David -- Butler, Adam -- Carter, Richard J -- Chen, Lina -- Cox, Anthony J -- Edkins, Sarah -- Kokko-Gonzales, Paula I -- Gormley, Niall A -- Grocock, Russell J -- Haudenschild, Christian D -- Hims, Matthew M -- James, Terena -- Jia, Mingming -- Kingsbury, Zoya -- Leroy, Catherine -- Marshall, John -- Menzies, Andrew -- Mudie, Laura J -- Ning, Zemin -- Royce, Tom -- Schulz-Trieglaff, Ole B -- Spiridou, Anastassia -- Stebbings, Lucy A -- Szajkowski, Lukasz -- Teague, Jon -- Williamson, David -- Chin, Lynda -- Ross, Mark T -- Campbell, Peter J -- Bentley, David R -- Futreal, P Andrew -- Stratton, Michael R -- 077012/Z/05/Z/Wellcome Trust/United Kingdom -- 088340/Wellcome Trust/United Kingdom -- 093867/Wellcome Trust/United Kingdom -- England -- Nature. 2010 Jan 14;463(7278):191-6. doi: 10.1038/nature08658. Epub 2009 Dec 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Wellcome Trust Sanger Institute, Hinxton CB10 1SA, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20016485" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Cell Line, Tumor ; DNA Damage/genetics ; DNA Mutational Analysis ; DNA Repair/genetics ; Gene Dosage/genetics ; Genes, Neoplasm/*genetics ; Genome, Human/*genetics ; Humans ; Loss of Heterozygosity/genetics ; Male ; Melanoma/etiology/genetics ; MicroRNAs/genetics ; Mutagenesis, Insertional/genetics ; Mutation/*genetics ; Neoplasms/etiology/*genetics ; Polymorphism, Single Nucleotide/genetics ; Precision Medicine ; Sequence Deletion/genetics ; Ultraviolet Rays
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 3
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    Nature Publishing Group (NPG)
    Publication Date: 2009-01-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dalton, Rex -- England -- Nature. 2009 Jan 22;457(7228):369. doi: 10.1038/457369a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19158758" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Breeding/economics/*methods ; Cattle/*genetics ; Dairying/economics/*methods ; Female ; Internationality ; Male ; Milk/*secretion/*standards ; Oligonucleotide Array Sequence Analysis ; Polymorphism, Single Nucleotide/genetics ; United States ; United States Department of Agriculture
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  • 4
    Publication Date: 2009-08-12
    Description: Reprogramming somatic cells to induced pluripotent stem (iPS) cells has been accomplished by expressing pluripotency factors and oncogenes, but the low frequency and tendency to induce malignant transformation compromise the clinical utility of this powerful approach. We address both issues by investigating the mechanisms limiting reprogramming efficiency in somatic cells. Here we show that reprogramming factors can activate the p53 (also known as Trp53 in mice, TP53 in humans) pathway. Reducing signalling to p53 by expressing a mutated version of one of its negative regulators, by deleting or knocking down p53 or its target gene, p21 (also known as Cdkn1a), or by antagonizing reprogramming-induced apoptosis in mouse fibroblasts increases reprogramming efficiency. Notably, decreasing p53 protein levels enabled fibroblasts to give rise to iPS cells capable of generating germline-transmitting chimaeric mice using only Oct4 (also known as Pou5f1) and Sox2. Furthermore, silencing of p53 significantly increased the reprogramming efficiency of human somatic cells. These results provide insights into reprogramming mechanisms and suggest new routes to more efficient reprogramming while minimizing the use of oncogenes.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2735889/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2735889/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kawamura, Teruhisa -- Suzuki, Jotaro -- Wang, Yunyuan V -- Menendez, Sergio -- Morera, Laura Batlle -- Raya, Angel -- Wahl, Geoffrey M -- Izpisua Belmonte, Juan Carlos -- 5 R01 CA061449/CA/NCI NIH HHS/ -- 5 R01 CA100845/CA/NCI NIH HHS/ -- R01 CA061449/CA/NCI NIH HHS/ -- R01 CA061449-30/CA/NCI NIH HHS/ -- R01 CA100845/CA/NCI NIH HHS/ -- R01 CA100845-05/CA/NCI NIH HHS/ -- R33 HL088293/HL/NHLBI NIH HHS/ -- R33 HL088293-03/HL/NHLBI NIH HHS/ -- England -- Nature. 2009 Aug 27;460(7259):1140-4. doi: 10.1038/nature08311. Epub 2009 Aug 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Gene Expression Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, California 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19668186" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cells, Cultured ; Cellular Reprogramming/*physiology ; Cyclin-Dependent Kinase Inhibitor p21/deficiency/genetics/metabolism ; Down-Regulation ; Embryo, Mammalian/cytology ; Female ; Fibroblasts/cytology/metabolism ; Humans ; Keratinocytes ; Male ; Mice ; Mice, Inbred C57BL ; Pluripotent Stem Cells/*cytology/*metabolism ; Tumor Suppressor Protein p53/deficiency/genetics/*metabolism
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  • 5
    Publication Date: 2009-09-26
    Description: India has been underrepresented in genome-wide surveys of human variation. We analyse 25 diverse groups in India to provide strong evidence for two ancient populations, genetically divergent, that are ancestral to most Indians today. One, the 'Ancestral North Indians' (ANI), is genetically close to Middle Easterners, Central Asians, and Europeans, whereas the other, the 'Ancestral South Indians' (ASI), is as distinct from ANI and East Asians as they are from each other. By introducing methods that can estimate ancestry without accurate ancestral populations, we show that ANI ancestry ranges from 39-71% in most Indian groups, and is higher in traditionally upper caste and Indo-European speakers. Groups with only ASI ancestry may no longer exist in mainland India. However, the indigenous Andaman Islanders are unique in being ASI-related groups without ANI ancestry. Allele frequency differences between groups in India are larger than in Europe, reflecting strong founder effects whose signatures have been maintained for thousands of years owing to endogamy. We therefore predict that there will be an excess of recessive diseases in India, which should be possible to screen and map genetically.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2842210/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2842210/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reich, David -- Thangaraj, Kumarasamy -- Patterson, Nick -- Price, Alkes L -- Singh, Lalji -- HG004168/HG/NHGRI NIH HHS/ -- R01 HG006399/HG/NHGRI NIH HHS/ -- U01 HG004168/HG/NHGRI NIH HHS/ -- U01 HG004168-03/HG/NHGRI NIH HHS/ -- England -- Nature. 2009 Sep 24;461(7263):489-94. doi: 10.1038/nature08365.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA. reich@genetics.med.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19779445" target="_blank"〉PubMed〈/a〉
    Keywords: Asia/ethnology ; Chromosomes, Human, Y/genetics ; Continental Population Groups/genetics ; DNA, Mitochondrial/genetics ; Ethnic Groups/*genetics ; Europe/ethnology ; Female ; Founder Effect ; Gene Frequency ; Genes, Recessive/genetics ; Genetic Variation/*genetics ; Genetics, Medical ; Genetics, Population ; Genome, Human/genetics ; Genomics ; Genotype ; Geography ; Humans ; India ; Language ; Linkage Disequilibrium/genetics ; Male ; Middle East/ethnology ; *Phylogeny ; Polymorphism, Single Nucleotide/genetics ; Principal Component Analysis
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  • 6
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    Nature Publishing Group (NPG)
    Publication Date: 2009-06-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reiff, Sarah B -- Striepen, Boris -- England -- Nature. 2009 Jun 18;459(7249):918-9. doi: 10.1038/459918a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19536248" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Humans ; Malaria, Falciparum/drug therapy/*parasitology ; Models, Biological ; Plasmodium falciparum/*metabolism ; Protein Binding ; Protein Transport ; Protozoan Proteins/antagonists & inhibitors/*metabolism ; Vacuoles/metabolism/parasitology
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  • 7
    Publication Date: 2009-07-25
    Description: MicroRNAs (miRNAs) have emerged as key post-transcriptional regulators of gene expression, involved in diverse physiological and pathological processes. Although miRNAs can function as both tumour suppressors and oncogenes in tumour development, a widespread downregulation of miRNAs is commonly observed in human cancers and promotes cellular transformation and tumorigenesis. This indicates an inherent significance of small RNAs in tumour suppression. However, the connection between tumour suppressor networks and miRNA biogenesis machineries has not been investigated in depth. Here we show that a central tumour suppressor, p53, enhances the post-transcriptional maturation of several miRNAs with growth-suppressive function, including miR-16-1, miR-143 and miR-145, in response to DNA damage. In HCT116 cells and human diploid fibroblasts, p53 interacts with the Drosha processing complex through the association with DEAD-box RNA helicase p68 (also known as DDX5) and facilitates the processing of primary miRNAs to precursor miRNAs. We also found that transcriptionally inactive p53 mutants interfere with a functional assembly between Drosha complex and p68, leading to attenuation of miRNA processing activity. These findings suggest that transcription-independent modulation of miRNA biogenesis is intrinsically embedded in a tumour suppressive program governed by p53. Our study reveals a previously unrecognized function of p53 in miRNA processing, which may underlie key aspects of cancer biology.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Suzuki, Hiroshi I -- Yamagata, Kaoru -- Sugimoto, Koichi -- Iwamoto, Takashi -- Kato, Shigeaki -- Miyazono, Kohei -- England -- Nature. 2009 Jul 23;460(7254):529-33. doi: 10.1038/nature08199.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Pathology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19626115" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Line ; DNA Damage/physiology ; Gene Expression Regulation ; HCT116 Cells ; Humans ; MicroRNAs/*metabolism ; Mutation ; *RNA Processing, Post-Transcriptional ; Ribonuclease III/metabolism ; Tumor Suppressor Protein p53/genetics/*metabolism
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  • 8
    Publication Date: 2009-06-12
    Description: Cells undergoing developmental processes are characterized by persistent non-genetic alterations in chromatin, termed epigenetic changes, represented by distinct patterns of DNA methylation and histone post-translational modifications. Sirtuins, a group of conserved NAD(+)-dependent deacetylases or ADP-ribosyltransferases, promote longevity in diverse organisms; however, their molecular mechanisms in ageing regulation remain poorly understood. Yeast Sir2, the first member of the family to be found, establishes and maintains chromatin silencing by removing histone H4 lysine 16 acetylation and bringing in other silencing proteins. Here we report an age-associated decrease in Sir2 protein abundance accompanied by an increase in H4 lysine 16 acetylation and loss of histones at specific subtelomeric regions in replicatively old yeast cells, which results in compromised transcriptional silencing at these loci. Antagonizing activities of Sir2 and Sas2, a histone acetyltransferase, regulate the replicative lifespan through histone H4 lysine 16 at subtelomeric regions. This pathway, distinct from existing ageing models for yeast, may represent an evolutionarily conserved function of sirtuins in regulation of replicative ageing by maintenance of intact telomeric chromatin.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2702157/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2702157/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dang, Weiwei -- Steffen, Kristan K -- Perry, Rocco -- Dorsey, Jean A -- Johnson, F Brad -- Shilatifard, Ali -- Kaeberlein, Matt -- Kennedy, Brian K -- Berger, Shelley L -- R01 AG025549/AG/NIA NIH HHS/ -- R01 AG025549-01A2/AG/NIA NIH HHS/ -- R01 AG025549-03/AG/NIA NIH HHS/ -- R01 CA089455/CA/NCI NIH HHS/ -- England -- Nature. 2009 Jun 11;459(7248):802-7. doi: 10.1038/nature08085.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Gene Expression and Regulation Program, The Wistar Institute Philadelphia, Pennsylvania 19104, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19516333" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylation ; Acetyltransferases/metabolism ; Cell Division ; Chromatin/genetics/metabolism ; Epistasis, Genetic ; Gene Expression Regulation, Fungal ; Gene Silencing ; Histone Acetyltransferases ; Histone Deacetylase Inhibitors ; Histone Deacetylases/deficiency/metabolism ; Histones/*chemistry/genetics/*metabolism ; Lysine/*metabolism ; Mutant Proteins/genetics/metabolism ; Mutation ; Saccharomyces cerevisiae/*cytology/genetics/*metabolism ; Saccharomyces cerevisiae Proteins/metabolism ; Silent Information Regulator Proteins, Saccharomyces cerevisiae/antagonists & ; inhibitors/deficiency/metabolism ; Sirtuin 2 ; Sirtuins/antagonists & inhibitors/deficiency/metabolism ; Telomere/genetics/metabolism ; Transcription, Genetic
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  • 9
    Publication Date: 2009-10-30
    Description: The leading cause of infertility in men and women is quantitative and qualitative defects in human germ-cell (oocyte and sperm) development. Yet, it has not been possible to examine the unique developmental genetics of human germ-cell formation and differentiation owing to inaccessibility of germ cells during fetal development. Although several studies have shown that germ cells can be differentiated from mouse and human embryonic stem cells, human germ cells differentiated in these studies generally did not develop beyond the earliest stages. Here we used a germ-cell reporter to quantify and isolate primordial germ cells derived from both male and female human embryonic stem cells. By silencing and overexpressing genes that encode germ-cell-specific cytoplasmic RNA-binding proteins (not transcription factors), we modulated human germ-cell formation and developmental progression. We observed that human DAZL (deleted in azoospermia-like) functions in primordial germ-cell formation, whereas closely related genes DAZ and BOULE (also called BOLL) promote later stages of meiosis and development of haploid gametes. These results are significant to the generation of gametes for future basic science and potential clinical applications.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3133736/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3133736/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kee, Kehkooi -- Angeles, Vanessa T -- Flores, Martha -- Nguyen, Ha Nam -- Reijo Pera, Renee A -- R01 HD047721/HD/NICHD NIH HHS/ -- R01 HD047721-06/HD/NICHD NIH HHS/ -- R01HD047721/HD/NICHD NIH HHS/ -- U54 HD055764/HD/NICHD NIH HHS/ -- U54 HD055764-015755/HD/NICHD NIH HHS/ -- U54HD055764/HD/NICHD NIH HHS/ -- England -- Nature. 2009 Nov 12;462(7270):222-5. doi: 10.1038/nature08562. Epub 2009 Oct 28.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Human Embryonic Stem Cell Research and Education, Institute for Stem Cell Biology & Regenerative Medicine, Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford University, Palo Alto, California 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19865085" target="_blank"〉PubMed〈/a〉
    Keywords: Bone Morphogenetic Proteins/metabolism ; Cell Count ; *Cell Differentiation ; Cell Line ; Cellular Reprogramming ; Embryonic Stem Cells/cytology/metabolism ; Female ; Gene Expression ; Gene Silencing ; Genes, Reporter ; Germ Cells/*cytology/*metabolism ; *Haploidy ; Humans ; Male ; Meiosis ; Organ Specificity ; RNA-Binding Proteins/genetics/*metabolism
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  • 10
    Publication Date: 2009-07-25
    Description: African primates are naturally infected with over 40 different simian immunodeficiency viruses (SIVs), two of which have crossed the species barrier and generated human immunodeficiency virus types 1 and 2 (HIV-1 and HIV-2). Unlike the human viruses, however, SIVs do not generally cause acquired immunodeficiency syndrome (AIDS) in their natural hosts. Here we show that SIVcpz, the immediate precursor of HIV-1, is pathogenic in free-ranging chimpanzees. By following 94 members of two habituated chimpanzee communities in Gombe National Park, Tanzania, for over 9 years, we found a 10- to 16-fold higher age-corrected death hazard for SIVcpz-infected (n = 17) compared to uninfected (n = 77) chimpanzees. We also found that SIVcpz-infected females were less likely to give birth and had a higher infant mortality rate than uninfected females. Immunohistochemistry and in situ hybridization of post-mortem spleen and lymph node samples from three infected and two uninfected chimpanzees revealed significant CD4(+) T-cell depletion in all infected individuals, with evidence of high viral replication and extensive follicular dendritic cell virus trapping in one of them. One female, who died within 3 years of acquiring SIVcpz, had histopathological findings consistent with end-stage AIDS. These results indicate that SIVcpz, like HIV-1, is associated with progressive CD4(+) T-cell loss, lymphatic tissue destruction and premature death. These findings challenge the prevailing view that all natural SIV infections are non-pathogenic and suggest that SIVcpz has a substantial negative impact on the health, reproduction and lifespan of chimpanzees in the wild.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2872475/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2872475/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Keele, Brandon F -- Jones, James Holland -- Terio, Karen A -- Estes, Jacob D -- Rudicell, Rebecca S -- Wilson, Michael L -- Li, Yingying -- Learn, Gerald H -- Beasley, T Mark -- Schumacher-Stankey, Joann -- Wroblewski, Emily -- Mosser, Anna -- Raphael, Jane -- Kamenya, Shadrack -- Lonsdorf, Elizabeth V -- Travis, Dominic A -- Mlengeya, Titus -- Kinsel, Michael J -- Else, James G -- Silvestri, Guido -- Goodall, Jane -- Sharp, Paul M -- Shaw, George M -- Pusey, Anne E -- Hahn, Beatrice H -- HHSN266200400088C/PHS HHS/ -- P30 AI 27767/AI/NIAID NIH HHS/ -- P30 AI027767/AI/NIAID NIH HHS/ -- P30 AI027767-21A17134/AI/NIAID NIH HHS/ -- R01 AI058715/AI/NIAID NIH HHS/ -- R01 AI058715-06A1/AI/NIAID NIH HHS/ -- R01 AI50529/AI/NIAID NIH HHS/ -- R01 AI58715/AI/NIAID NIH HHS/ -- R37 AI050529/AI/NIAID NIH HHS/ -- R37 AI050529-06A1/AI/NIAID NIH HHS/ -- RR-00165/RR/NCRR NIH HHS/ -- T32 GM008111/GM/NIGMS NIH HHS/ -- U19 AI067854/AI/NIAID NIH HHS/ -- U19 AI067854-059010/AI/NIAID NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2009 Jul 23;460(7254):515-9. doi: 10.1038/nature08200.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19626114" target="_blank"〉PubMed〈/a〉
    Keywords: Acquired Immunodeficiency Syndrome/pathology ; Africa ; Animals ; Animals, Wild ; CD4-Positive T-Lymphocytes/immunology ; Female ; Humans ; Male ; Molecular Sequence Data ; Pan troglodytes/*virology ; Prevalence ; Simian Acquired Immunodeficiency ; Syndrome/epidemiology/immunology/*mortality/*pathology ; Simian Immunodeficiency Virus/*physiology
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  • 11
    Publication Date: 2009-08-21
    Description: A decision is a commitment to a proposition or plan of action based on evidence and the expected costs and benefits associated with the outcome. Progress in a variety of fields has led to a quantitative understanding of the mechanisms that evaluate evidence and reach a decision. Several formalisms propose that a representation of noisy evidence is evaluated against a criterion to produce a decision. Without additional evidence, however, these formalisms fail to explain why a decision-maker would change their mind. Here we extend a model, developed to account for both the timing and the accuracy of the initial decision, to explain subsequent changes of mind. Subjects made decisions about a noisy visual stimulus, which they indicated by moving a handle. Although they received no additional information after initiating their movement, their hand trajectories betrayed a change of mind in some trials. We propose that noisy evidence is accumulated over time until it reaches a criterion level, or bound, which determines the initial decision, and that the brain exploits information that is in the processing pipeline when the initial decision is made to subsequently either reverse or reaffirm the initial decision. The model explains both the frequency of changes of mind as well as their dependence on both task difficulty and whether the initial decision was accurate or erroneous. The theoretical and experimental findings advance the understanding of decision-making to the highly flexible and cognitive acts of vacillation and self-correction.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2875179/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2875179/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Resulaj, Arbora -- Kiani, Roozbeh -- Wolpert, Daniel M -- Shadlen, Michael N -- 077730/Wellcome Trust/United Kingdom -- EY11378/EY/NEI NIH HHS/ -- Howard Hughes Medical Institute/ -- Wellcome Trust/United Kingdom -- England -- Nature. 2009 Sep 10;461(7261):263-6. doi: 10.1038/nature08275. Epub 2009 Aug 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Computational and Biological Learning Laboratory, Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19693010" target="_blank"〉PubMed〈/a〉
    Keywords: Computers ; Cues ; Decision Making/*physiology ; Female ; Hand/physiology ; Humans ; Male ; Models, Neurological ; Models, Psychological ; Motion ; Movement ; Photic Stimulation ; Psychomotor Performance ; Reaction Time ; Time Factors
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  • 12
    Publication Date: 2009-08-28
    Description: Mitochondria are found in all eukaryotic cells and contain their own genome (mitochondrial DNA or mtDNA). Unlike the nuclear genome, which is derived from both the egg and sperm at fertilization, the mtDNA in the embryo is derived almost exclusively from the egg; that is, it is of maternal origin. Mutations in mtDNA contribute to a diverse range of currently incurable human diseases and disorders. To establish preclinical models for new therapeutic approaches, we demonstrate here that the mitochondrial genome can be efficiently replaced in mature non-human primate oocytes (Macaca mulatta) by spindle-chromosomal complex transfer from one egg to an enucleated, mitochondrial-replete egg. The reconstructed oocytes with the mitochondrial replacement were capable of supporting normal fertilization, embryo development and produced healthy offspring. Genetic analysis confirmed that nuclear DNA in the three infants born so far originated from the spindle donors whereas mtDNA came from the cytoplast donors. No contribution of spindle donor mtDNA was detected in offspring. Spindle replacement is shown here as an efficient protocol replacing the full complement of mitochondria in newly generated embryonic stem cell lines. This approach may offer a reproductive option to prevent mtDNA disease transmission in affected families.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2774772/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2774772/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tachibana, Masahito -- Sparman, Michelle -- Sritanaudomchai, Hathaitip -- Ma, Hong -- Clepper, Lisa -- Woodward, Joy -- Li, Ying -- Ramsey, Cathy -- Kolotushkina, Olena -- Mitalipov, Shoukhrat -- P01 HD047675/HD/NICHD NIH HHS/ -- P01 HD047675-01A17045/HD/NICHD NIH HHS/ -- P01 HD047675-04/HD/NICHD NIH HHS/ -- P51 RR000163/RR/NCRR NIH HHS/ -- P51 RR000163-486766/RR/NCRR NIH HHS/ -- P51 RR000163-486775/RR/NCRR NIH HHS/ -- P51 RR000163-486819/RR/NCRR NIH HHS/ -- P51 RR000163-496038/RR/NCRR NIH HHS/ -- P51 RR000163-496045/RR/NCRR NIH HHS/ -- P51 RR000163-496074/RR/NCRR NIH HHS/ -- P51 RR000163-496133/RR/NCRR NIH HHS/ -- P51 RR000163-496134/RR/NCRR NIH HHS/ -- P51 RR000163-496136/RR/NCRR NIH HHS/ -- P51 RR000163-496137/RR/NCRR NIH HHS/ -- R01 HD057121/HD/NICHD NIH HHS/ -- R01 HD057121-01A2/HD/NICHD NIH HHS/ -- R01 NS044330/NS/NINDS NIH HHS/ -- R01 NS044330-05/NS/NINDS NIH HHS/ -- R24 RR013632/RR/NCRR NIH HHS/ -- R24 RR013632-10/RR/NCRR NIH HHS/ -- England -- Nature. 2009 Sep 17;461(7262):367-72. doi: 10.1038/nature08368. Epub 2009 Aug 26.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Oregon National Primate Research Center, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19710649" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Nucleus/genetics ; DNA, Mitochondrial/analysis/*genetics ; Embryo Transfer ; Embryonic Stem Cells/*cytology/*metabolism/transplantation ; Female ; Fertilization in Vitro ; Genes, Mitochondrial/*genetics ; Genome, Mitochondrial/*genetics ; Macaca mulatta/embryology/*genetics ; Male ; Meiosis ; Mitochondrial Diseases/genetics/prevention & control ; Mutation ; Oocytes/cytology/metabolism ; Pregnancy ; *Reproductive Techniques, Assisted
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  • 13
    Publication Date: 2009-08-21
    Description: Activity is thought to guide the patterning of synaptic connections in the developing nervous system. Specifically, differences in the activity of converging inputs are thought to cause the elimination of synapses from less active inputs and increase connectivity with more active inputs. Here we present findings that challenge the generality of this notion and offer a new view of the role of activity in synapse development. To imbalance neurotransmission from different sets of inputs in vivo, we generated transgenic mice in which ON but not OFF types of bipolar cells in the retina express tetanus toxin (TeNT). During development, retinal ganglion cells (RGCs) select between ON and OFF bipolar cell inputs (ON or OFF RGCs) or establish a similar number of synapses with both on separate dendritic arborizations (ON-OFF RGCs). In TeNT retinas, ON RGCs correctly selected the silenced ON bipolar cell inputs over the transmitting OFF bipolar cells, but were connected with them through fewer synapses at maturity. Time-lapse imaging revealed that this was caused by a reduced rate of synapse formation rather than an increase in synapse elimination. Similarly, TeNT-expressing ON bipolar cell axons generated fewer presynaptic active zones. The remaining active zones often recruited multiple, instead of single, synaptic ribbons. ON-OFF RGCs in TeNT mice maintained convergence of ON and OFF bipolar cells inputs and had fewer synapses on their ON arbor without changes to OFF arbor synapses. Our results reveal an unexpected and remarkably selective role for activity in circuit development in vivo, regulating synapse formation but not elimination, affecting synapse number but not dendritic or axonal patterning, and mediating independently the refinement of connections from parallel (ON and OFF) processing streams even where they converge onto the same postsynaptic cell.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2746695/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2746695/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kerschensteiner, Daniel -- Morgan, Josh L -- Parker, Edward D -- Lewis, Renate M -- Wong, Rachel O L -- EY01730/EY/NEI NIH HHS/ -- EY10699/EY/NEI NIH HHS/ -- R01 EY010699/EY/NEI NIH HHS/ -- R01 EY010699-16/EY/NEI NIH HHS/ -- T32 EY07031/EY/NEI NIH HHS/ -- England -- Nature. 2009 Aug 20;460(7258):1016-20. doi: 10.1038/nature08236.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Anatomy and Neurobiology, Washington University School of Medicine, St Louis, Missouri 63110, USA. KerschensteinerD@vision.wustl.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19693082" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/metabolism ; Dendrites/metabolism ; Female ; Glutamic Acid/metabolism ; Male ; Mice ; Mice, Transgenic ; Receptors, Kainic Acid/genetics/metabolism ; Retinal Bipolar Cells/cytology/metabolism ; Retinal Ganglion Cells/cytology/metabolism ; Synapses/*metabolism ; Synaptic Transmission/*physiology ; Tetanus Toxin/genetics/metabolism
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  • 14
    Publication Date: 2009-12-18
    Description: An important challenge in systems biology is to quantitatively describe microbial growth using a few measurable parameters that capture the essence of this complex phenomenon. Two key events at the cell membrane-extracellular glucose sensing and uptake-initiate the budding yeast's growth on glucose. However, conventional growth models focus almost exclusively on glucose uptake. Here we present results from growth-rate experiments that cannot be explained by focusing on glucose uptake alone. By imposing a glucose uptake rate independent of the sensed extracellular glucose level, we show that despite increasing both the sensed glucose concentration and uptake rate, the cell's growth rate can decrease or even approach zero. We resolve this puzzle by showing that the interaction between glucose perception and import, not their individual actions, determines the central features of growth, and characterize this interaction using a quantitative model. Disrupting this interaction by knocking out two key glucose sensors significantly changes the cell's growth rate, yet uptake rates are unchanged. This is due to a decrease in burden that glucose perception places on the cells. Our work shows that glucose perception and import are separate and pivotal modules of yeast growth, the interaction of which can be precisely tuned and measured.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2796206/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2796206/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Youk, Hyun -- van Oudenaarden, Alexander -- DP1 OD003936/OD/NIH HHS/ -- DP1 OD003936-01/OD/NIH HHS/ -- DP1 OD003936-02/OD/NIH HHS/ -- R01 GM068957/GM/NIGMS NIH HHS/ -- R01 GM068957-06/GM/NIGMS NIH HHS/ -- R01 GM068957-07/GM/NIGMS NIH HHS/ -- England -- Nature. 2009 Dec 17;462(7275):875-9. doi: 10.1038/nature08653.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20016593" target="_blank"〉PubMed〈/a〉
    Keywords: Biological Transport/drug effects ; Cell Growth Processes/drug effects ; Cell Membrane/drug effects/metabolism ; Doxycycline/pharmacology ; Glucose/*metabolism/pharmacology ; Kinetics ; Models, Biological ; Saccharomyces cerevisiae/cytology/drug effects/*growth & development/*metabolism
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  • 15
    Publication Date: 2009-09-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Graves, Jennifer A Marshall -- England -- Nature. 2009 Sep 10;461(7261):177-8. doi: 10.1038/461177a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19741690" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Chick Embryo ; Chickens/*genetics/*physiology ; Disorders of Sex Development ; Evolution, Molecular ; Female ; Gene Dosage/genetics ; Humans ; Male ; Models, Genetic ; Ovary/embryology/metabolism ; RNA Interference ; SOX9 Transcription Factor/genetics/metabolism ; Sex Chromosomes/*genetics ; *Sex Determination Processes ; Testis/embryology/metabolism ; Transcription Factors/deficiency/*genetics/*metabolism
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  • 16
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    Nature Publishing Group (NPG)
    Publication Date: 2009-01-09
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Young, Larry J -- England -- Nature. 2009 Jan 8;457(7226):148. doi: 10.1038/457148a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Yerkes National Primate Research Center, Emory University, Atlanta, Georgia 30322, USA. lyoun03@emory.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19129828" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arvicolinae/genetics/physiology ; Dopamine/metabolism ; Female ; Humans ; *Love ; Male ; Maternal Behavior/physiology ; Oxytocin/*metabolism ; Pair Bond ; Paternal Behavior ; Receptors, Vasopressin/genetics/metabolism ; Sexual Behavior/drug effects/physiology ; Vasopressins/*metabolism
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  • 17
    Publication Date: 2009-09-11
    Description: It is widely accepted that tissue differentiation and morphogenesis in multicellular organisms are regulated by tightly controlled concentration gradients of morphogens. How exactly these gradients are formed, however, remains unclear. Here we show that Fgf8 morphogen gradients in living zebrafish embryos are established and maintained by two essential factors: fast, free diffusion of single molecules away from the source through extracellular space, and a sink function of the receiving cells, regulated by receptor-mediated endocytosis. Evidence is provided by directly examining single molecules of Fgf8 in living tissue by fluorescence correlation spectroscopy, quantifying their local mobility and concentration with high precision. By changing the degree of uptake of Fgf8 into its target cells, we are able to alter the shape of the Fgf8 gradient. Our results demonstrate that a freely diffusing morphogen can set up concentration gradients in a complex multicellular tissue by a simple source-sink mechanism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yu, Shuizi Rachel -- Burkhardt, Markus -- Nowak, Matthias -- Ries, Jonas -- Petrasek, Zdenek -- Scholpp, Steffen -- Schwille, Petra -- Brand, Michael -- England -- Nature. 2009 Sep 24;461(7263):533-6. doi: 10.1038/nature08391. Epub 2009 Sep 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Developmental Genetics, Biotechnology Center, TUD, Tatzberg 47-49, 01307 Dresden, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19741606" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Diffusion ; Embryo, Nonmammalian/*cytology/embryology/*metabolism ; *Endocytosis ; Extracellular Space/metabolism ; Fibroblast Growth Factors/genetics/*metabolism ; Gastrulation ; Green Fluorescent Proteins/genetics/metabolism ; Models, Biological ; Morphogenesis/*physiology ; Receptors, Fibroblast Growth Factor/metabolism ; Zebrafish/*embryology/*metabolism ; Zebrafish Proteins/genetics/*metabolism
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  • 18
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    Nature Publishing Group (NPG)
    Publication Date: 2009-12-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Buchen, Lizzie -- England -- Nature. 2009 Dec 3;462(7273):562-4. doi: 10.1038/462562a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19956235" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Behavior/physiology ; *Behavior, Animal ; Behavioral Research/*instrumentation/methods ; Drosophila melanogaster/*physiology ; Female ; Humans ; Male ; Software ; Video Recording/instrumentation/methods
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  • 19
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    Nature Publishing Group (NPG)
    Publication Date: 2009-11-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Buchen, Lizzie -- England -- Nature. 2009 Nov 26;462(7272):403. doi: 10.1038/462403a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19940891" target="_blank"〉PubMed〈/a〉
    Keywords: Brain/*anatomy & histology/pathology/*physiology/physiopathology ; Brain Mapping/methods/trends ; Humans ; Male ; Memory/physiology ; Models, Neurological ; Molecular Imaging/methods/trends ; Neuroanatomy/*methods/trends
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  • 20
    Publication Date: 2009-01-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rockenbach, Bettina -- Milinski, Manfred -- England -- Nature. 2009 Jan 1;457(7225):39-40. doi: 10.1038/457039a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19122632" target="_blank"〉PubMed〈/a〉
    Keywords: Altruism ; Biological Evolution ; *Cooperative Behavior ; Cost-Benefit Analysis ; Female ; *Game Theory ; Humans ; Male ; Models, Psychological ; *Punishment/psychology
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  • 21
    Publication Date: 2009-11-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Michalakis, Yannis -- Renaud, Francois -- England -- Nature. 2009 Nov 19;462(7271):298-300. doi: 10.1038/462298a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19924207" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Culicidae/microbiology/parasitology/*physiology ; Fungi/physiology ; Humans ; Insect Control ; Insect Vectors/microbiology/*physiology ; Insecticides ; *Malaria/parasitology/physiopathology/prevention & control/transmission ; Mutation ; Plasmodium/genetics/*physiology
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  • 22
    Publication Date: 2009-05-05
    Description: The proteasome is a protease that controls diverse processes in eukaryotic cells. Its regulatory particle (RP) initiates the degradation of ubiquitin-protein conjugates by unfolding the substrate and translocating it into the proteasome core particle (CP) to be degraded. The RP has 19 subunits, and their pathway of assembly is not understood. Here we show that in the yeast Saccharomyces cerevisiae three proteins are found associated with RP but not with the RP-CP holoenzyme: Nas6, Rpn14 and Hsm3. Mutations in the corresponding genes confer proteasome loss-of-function phenotypes, despite their virtual absence from the holoenzyme. These effects result from deficient RP assembly. Thus, Nas6, Rpn14 and Hsm3 are RP chaperones. The RP contains six ATPases-the Rpt proteins-and each RP chaperone binds to the carboxy-terminal domain of a specific Rpt. We show in an accompanying study that RP assembly is templated through the Rpt C termini, apparently by their insertion into binding pockets in the CP. Thus, RP chaperones may regulate proteasome assembly by directly restricting the accessibility of Rpt C termini to the CP. In addition, competition between the RP chaperones and the CP for Rpt engagement may explain the release of RP chaperones as proteasomes mature.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2727592/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2727592/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roelofs, Jeroen -- Park, Soyeon -- Haas, Wilhelm -- Tian, Geng -- McAllister, Fiona E -- Huo, Ying -- Lee, Byung-Hoon -- Zhang, Fan -- Shi, Yigong -- Gygi, Steven P -- Finley, Daniel -- 5F32GM75737-2/GM/NIGMS NIH HHS/ -- GM043601/GM/NIGMS NIH HHS/ -- GM67945/GM/NIGMS NIH HHS/ -- R37 GM043601/GM/NIGMS NIH HHS/ -- R37 GM043601-19/GM/NIGMS NIH HHS/ -- England -- Nature. 2009 Jun 11;459(7248):861-5. doi: 10.1038/nature08063.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19412159" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphatases/chemistry/metabolism ; Carrier Proteins/genetics/metabolism ; Conserved Sequence ; Evolution, Molecular ; Holoenzymes/chemistry/metabolism ; Humans ; Models, Molecular ; Molecular Chaperones/genetics/*metabolism ; Mutation ; Phenotype ; Proteasome Endopeptidase Complex/*chemistry/genetics/*metabolism ; Protein Binding ; Protein Structure, Tertiary ; Proto-Oncogene Proteins/genetics/metabolism ; Saccharomyces cerevisiae/*enzymology/genetics ; Saccharomyces cerevisiae Proteins/genetics/metabolism
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  • 23
    Publication Date: 2009-06-19
    Description: Several hundred malaria parasite proteins are exported beyond an encasing vacuole and into the cytosol of the host erythrocyte, a process that is central to the virulence and viability of the causative Plasmodium species. The trafficking machinery responsible for this export is unknown. Here we identify in Plasmodium falciparum a translocon of exported proteins (PTEX), which is located in the vacuole membrane. The PTEX complex is ATP-powered, and comprises heat shock protein 101 (HSP101; a ClpA/B-like ATPase from the AAA+ superfamily, of a type commonly associated with protein translocons), a novel protein termed PTEX150 and a known parasite protein, exported protein 2 (EXP2). EXP2 is the potential channel, as it is the membrane-associated component of the core PTEX complex. Two other proteins, a new protein PTEX88 and thioredoxin 2 (TRX2), were also identified as PTEX components. As a common portal for numerous crucial processes, this translocon offers a new avenue for therapeutic intervention.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2725363/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2725363/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉de Koning-Ward, Tania F -- Gilson, Paul R -- Boddey, Justin A -- Rug, Melanie -- Smith, Brian J -- Papenfuss, Anthony T -- Sanders, Paul R -- Lundie, Rachel J -- Maier, Alexander G -- Cowman, Alan F -- Crabb, Brendan S -- R01 AI044008-11/AI/NIAID NIH HHS/ -- R01 AI44008/AI/NIAID NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2009 Jun 18;459(7249):945-9. doi: 10.1038/nature08104.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Walter & Eliza Hall Institute of Medical Research, Melbourne 3052, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19536257" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Genetically Modified ; Malaria, Falciparum/*parasitology ; Models, Biological ; Multiprotein Complexes/*chemistry/*metabolism ; Plasmodium falciparum/*metabolism ; Protein Binding ; Protein Transport ; Protozoan Proteins/*metabolism
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  • 24
    Publication Date: 2009-07-17
    Description: In recent years, strikingly consistent patterns of biodiversity have been identified over space, time, organism type and geographical region. A neutral theory (assuming no environmental selection or organismal interactions) has been shown to predict many patterns of ecological biodiversity. This theory is based on a mechanism by which new species arise similarly to point mutations in a population without sexual reproduction. Here we report the simulation of populations with sexual reproduction, mutation and dispersal. We found simulated time dependence of speciation rates, species-area relationships and species abundance distributions consistent with the behaviours found in nature. From our results, we predict steady speciation rates, more species in one-dimensional environments than two-dimensional environments, three scaling regimes of species-area relationships and lognormal distributions of species abundance with an excess of rare species and a tail that may be approximated by Fisher's logarithmic series. These are consistent with dependences reported for, among others, global birds and flowering plants, marine invertebrate fossils, ray-finned fishes, British birds and moths, North American songbirds, mammal fossils from Kansas and Panamanian shrubs. Quantitative comparisons of specific cases are remarkably successful. Our biodiversity results provide additional evidence that species diversity arises without specific physical barriers. This is similar to heavy traffic flows, where traffic jams can form even without accidents or barriers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉de Aguiar, M A M -- Baranger, M -- Baptestini, E M -- Kaufman, L -- Bar-Yam, Y -- England -- Nature. 2009 Jul 16;460(7253):384-7. doi: 10.1038/nature08168.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉New England Complex Systems Institute, Cambridge, Massachusetts 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19606148" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biodiversity ; Disorders of Sex Development ; Extinction, Biological ; *Genetic Speciation ; Genotype ; Haploidy ; Models, Biological ; Mutation/genetics ; Population Dynamics ; Reproduction/genetics/*physiology ; Sexual Behavior, Animal ; Time Factors
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  • 25
    Publication Date: 2009-11-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rose, Steven -- England -- Nature. 2009 Nov 5;462(7269):35. doi: 10.1038/462035c.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19890309" target="_blank"〉PubMed〈/a〉
    Keywords: Continental Population Groups/*genetics ; *Ethics, Research ; Female ; Humans ; Intelligence/*genetics ; Male ; Reproducibility of Results ; *Sex Characteristics
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  • 26
    Publication Date: 2009-09-18
    Description: Hepatitis C virus (HCV) infection is the most common blood-borne infection in the United States, with estimates of 4 million HCV-infected individuals in the United States and 170 million worldwide. Most (70-80%) HCV infections persist and about 30% of individuals with persistent infection develop chronic liver disease, including cirrhosis and hepatocellular carcinoma. Epidemiological, viral and host factors have been associated with the differences in HCV clearance or persistence, and studies have demonstrated that a strong host immune response against HCV favours viral clearance. Thus, variation in genes involved in the immune response may contribute to the ability to clear the virus. In a recent genome-wide association study, a single nucleotide polymorphism (rs12979860) 3 kilobases upstream of the IL28B gene, which encodes the type III interferon IFN-3, was shown to associate strongly with more than a twofold difference in response to HCV drug treatment. To determine the potential effect of rs12979860 variation on outcome to HCV infection in a natural history setting, we genotyped this variant in HCV cohorts comprised of individuals who spontaneously cleared the virus (n = 388) or had persistent infection (n = 620). We show that the C/C genotype strongly enhances resolution of HCV infection among individuals of both European and African ancestry. To our knowledge, this is the strongest and most significant genetic effect associated with natural clearance of HCV, and these results implicate a primary role for IL28B in resolution of HCV infection.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3172006/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3172006/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Thomas, David L -- Thio, Chloe L -- Martin, Maureen P -- Qi, Ying -- Ge, Dongliang -- O'Huigin, Colm -- Kidd, Judith -- Kidd, Kenneth -- Khakoo, Salim I -- Alexander, Graeme -- Goedert, James J -- Kirk, Gregory D -- Donfield, Sharyne M -- Rosen, Hugo R -- Tobler, Leslie H -- Busch, Michael P -- McHutchison, John G -- Goldstein, David B -- Carrington, Mary -- HHSN261200800001E/CO/NCI NIH HHS/ -- HHSN261200800001E/PHS HHS/ -- R01 DA004334/DA/NIDA NIH HHS/ -- R01DA004334/DA/NIDA NIH HHS/ -- R01DA013324/DA/NIDA NIH HHS/ -- R01DK60590/DK/NIDDK NIH HHS/ -- R01HD41224/HD/NICHD NIH HHS/ -- R01HL076902/HL/NHLBI NIH HHS/ -- R56 DA004334/DA/NIDA NIH HHS/ -- Intramural NIH HHS/ -- England -- Nature. 2009 Oct 8;461(7265):798-801. doi: 10.1038/nature08463.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Johns Hopkins University, Division of Infectious Diseases, Baltimore, Maryland 21205, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19759533" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Africa/ethnology ; Europe/ethnology ; Female ; Gene Frequency ; Genetic Variation/*genetics ; Genome-Wide Association Study ; Genotype ; Hepacivirus/drug effects/*immunology/physiology ; Hepatitis C/drug therapy/*genetics/*immunology/virology ; Humans ; Interleukins/*genetics/*immunology ; Male ; Polymorphism, Single Nucleotide/genetics
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  • 27
    Publication Date: 2009-09-29
    Description: Sexual antagonism, or conflict between the sexes, has been proposed as a driving force in both sex-chromosome turnover and speciation. Although closely related species often have different sex-chromosome systems, it is unknown whether sex-chromosome turnover contributes to the evolution of reproductive isolation between species. Here we show that a newly evolved sex chromosome contains genes that contribute to speciation in threespine stickleback fish (Gasterosteus aculeatus). We first identified a neo-sex chromosome system found only in one member of a sympatric species pair in Japan. We then performed genetic linkage mapping of male-specific traits important for reproductive isolation between the Japanese species pair. The neo-X chromosome contains loci for male courtship display traits that contribute to behavioural isolation, whereas the ancestral X chromosome contains loci for both behavioural isolation and hybrid male sterility. Our work not only provides strong evidence for a large X-effect on reproductive isolation in a vertebrate system, but also provides direct evidence that a young neo-X chromosome contributes to reproductive isolation between closely related species. Our data indicate that sex-chromosome turnover might have a greater role in speciation than was previously appreciated.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2776091/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2776091/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kitano, Jun -- Ross, Joseph A -- Mori, Seiichi -- Kume, Manabu -- Jones, Felicity C -- Chan, Yingguang F -- Absher, Devin M -- Grimwood, Jane -- Schmutz, Jeremy -- Myers, Richard M -- Kingsley, David M -- Peichel, Catherine L -- P50 HG002568/HG/NHGRI NIH HHS/ -- P50 HG002568-08/HG/NHGRI NIH HHS/ -- P50 HG02568/HG/NHGRI NIH HHS/ -- R01 GM071854/GM/NIGMS NIH HHS/ -- R01 GM071854-05/GM/NIGMS NIH HHS/ -- T32 GM07270/GM/NIGMS NIH HHS/ -- England -- Nature. 2009 Oct 22;461(7267):1079-83. doi: 10.1038/nature08441. Epub 2009 Sep 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Human Biology, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, Seattle, Washington 98109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19783981" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Body Size ; Crosses, Genetic ; Female ; *Genetic Speciation ; Hybridization, Genetic ; Infertility, Male/genetics ; Japan ; Male ; Mating Preference, Animal ; Oceans and Seas ; Pacific Ocean ; Polymorphism, Single Nucleotide ; Quantitative Trait Loci ; Reproduction/genetics/physiology ; Sex Characteristics ; Sex Chromosomes/*genetics ; Smegmamorpha/anatomy & histology/classification/*genetics/*physiology ; Social Isolation ; Y Chromosome/genetics
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  • 28
    Publication Date: 2009-05-09
    Description: Chromatin modifications, especially histone-tail acetylation, have been implicated in memory formation. Increased histone-tail acetylation induced by inhibitors of histone deacetylases (HDACis) facilitates learning and memory in wild-type mice as well as in mouse models of neurodegeneration. Harnessing the therapeutic potential of HDACis requires knowledge of the specific HDAC family member(s) linked to cognitive enhancement. Here we show that neuron-specific overexpression of HDAC2, but not that of HDAC1, decreased dendritic spine density, synapse number, synaptic plasticity and memory formation. Conversely, Hdac2 deficiency resulted in increased synapse number and memory facilitation, similar to chronic treatment with HDACis in mice. Notably, reduced synapse number and learning impairment of HDAC2-overexpressing mice were ameliorated by chronic treatment with HDACis. Correspondingly, treatment with HDACis failed to further facilitate memory formation in Hdac2-deficient mice. Furthermore, analysis of promoter occupancy revealed an association of HDAC2 with the promoters of genes implicated in synaptic plasticity and memory formation. Taken together, our results suggest that HDAC2 functions in modulating synaptic plasticity and long-lasting changes of neural circuits, which in turn negatively regulates learning and memory. These observations encourage the development and testing of HDAC2-selective inhibitors for human diseases associated with memory impairment.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3498958/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3498958/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Guan, Ji-Song -- Haggarty, Stephen J -- Giacometti, Emanuela -- Dannenberg, Jan-Hermen -- Joseph, Nadine -- Gao, Jun -- Nieland, Thomas J F -- Zhou, Ying -- Wang, Xinyu -- Mazitschek, Ralph -- Bradner, James E -- DePinho, Ronald A -- Jaenisch, Rudolf -- Tsai, Li-Huei -- R01 DA028301/DA/NIDA NIH HHS/ -- R01 DA028301-02/DA/NIDA NIH HHS/ -- R01 NS051874/NS/NINDS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2009 May 7;459(7243):55-60. doi: 10.1038/nature07925.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19424149" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Butyrates/pharmacology ; Dendritic Spines/physiology ; Electrical Synapses/*physiology ; Female ; Gene Expression Regulation ; Hippocampus/metabolism ; Histone Deacetylase 1 ; Histone Deacetylase 2 ; Histone Deacetylase Inhibitors ; Histone Deacetylases/deficiency/genetics/*metabolism ; Hydroxamic Acids/pharmacology ; Learning/drug effects ; Male ; Memory/drug effects/*physiology ; Mice ; Mice, Inbred C57BL ; Mice, Knockout ; Neurons/metabolism ; Promoter Regions, Genetic/genetics ; Repressor Proteins/antagonists & inhibitors/genetics/*metabolism ; Sodium/pharmacology
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  • 29
    Publication Date: 2009-12-17
    Description: Mistranslation arising from confusion of serine for alanine by alanyl-tRNA synthetases (AlaRSs) has profound functional consequences. Throughout evolution, two editing checkpoints prevent disease-causing mistranslation from confusing glycine or serine for alanine at the active site of AlaRS. In both bacteria and mice, Ser poses a bigger challenge than Gly. One checkpoint is the AlaRS editing centre, and the other is from widely distributed AlaXps-free-standing, genome-encoded editing proteins that clear Ser-tRNA(Ala). The paradox of misincorporating both a smaller (glycine) and a larger (serine) amino acid suggests a deep conflict for nature-designed AlaRS. Here we show the chemical basis for this conflict. Nine crystal structures, together with kinetic and mutational analysis, provided snapshots of adenylate formation for each amino acid. An inherent dilemma is posed by constraints of a structural design that pins down the alpha-amino group of the bound amino acid by using an acidic residue. This design, dating back more than 3 billion years, creates a serendipitous interaction with the serine OH that is difficult to avoid. Apparently because no better architecture for the recognition of alanine could be found, the serine misactivation problem was solved through free-standing AlaXps, which appeared contemporaneously with early AlaRSs. The results reveal unconventional problems and solutions arising from the historical design of the protein synthesis machinery.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2799227/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2799227/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Guo, Min -- Chong, Yeeting E -- Shapiro, Ryan -- Beebe, Kirk -- Yang, Xiang-Lei -- Schimmel, Paul -- GM 15539/GM/NIGMS NIH HHS/ -- R01 GM015539/GM/NIGMS NIH HHS/ -- R01 GM015539-43/GM/NIGMS NIH HHS/ -- England -- Nature. 2009 Dec 10;462(7274):808-12. doi: 10.1038/nature08612.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Skaggs Institute for Chemical Biology and Department of Molecular Biology, The Scripps Research Institute, BCC-379, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20010690" target="_blank"〉PubMed〈/a〉
    Keywords: Alanine/*metabolism ; Alanine-tRNA Ligase/chemistry/genetics/*metabolism ; Aspartic Acid/genetics/metabolism ; Catalytic Domain ; Crystallization ; Escherichia coli/*enzymology ; Kinetics ; Models, Molecular ; Mutation ; *Protein Biosynthesis ; Protein Conformation ; RNA, Transfer, Ala/metabolism ; Serine/*metabolism ; Structure-Activity Relationship
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  • 30
    Publication Date: 2009-01-17
    Description: Autonomous and self-sustained oscillator circuits mediating the periodic induction of specific target genes are minimal genetic time-keeping devices found in the central and peripheral circadian clocks. They have attracted significant attention because of their intriguing dynamics and their importance in controlling critical repair, metabolic and signalling pathways. The precise molecular mechanism and expression dynamics of this mammalian circadian clock are still not fully understood. Here we describe a synthetic mammalian oscillator based on an auto-regulated sense-antisense transcription control circuit encoding a positive and a time-delayed negative feedback loop, enabling autonomous, self-sustained and tunable oscillatory gene expression. After detailed systems design with experimental analyses and mathematical modelling, we monitored oscillating concentrations of green fluorescent protein with tunable frequency and amplitude by time-lapse microscopy in real time in individual Chinese hamster ovary cells. The synthetic mammalian clock may provide an insight into the dynamics of natural periodic processes and foster advances in the design of prosthetic networks in future gene and cell therapies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tigges, Marcel -- Marquez-Lago, Tatiana T -- Stelling, Jorg -- Fussenegger, Martin -- England -- Nature. 2009 Jan 15;457(7227):309-12. doi: 10.1038/nature07616.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biosystems Science and Engineering, ETH Zurich, Mattenstrasse 26, CH-4058 Basel, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19148099" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Clocks/*physiology ; CHO Cells ; Circadian Rhythm/*physiology ; Cricetinae ; Cricetulus ; Feedback, Physiological ; Fluorescence ; Gene Expression Regulation/*genetics ; Genes, Synthetic/*genetics ; *Genetic Engineering ; Green Fluorescent Proteins/analysis/genetics/metabolism ; Models, Biological ; Reproducibility of Results ; Time Factors ; Transcription, Genetic
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  • 31
    Publication Date: 2009-08-13
    Description: Since the initial description of induced pluripotent stem (iPS) cells created by forced expression of four transcription factors in mouse fibroblasts, the technique has been used to generate embryonic stem (ES)-cell-like pluripotent cells from a variety of cell types in other species, including primates and rat. It has become a popular means to reprogram somatic genomes into an embryonic-like pluripotent state, and a preferred alternative to somatic-cell nuclear transfer and somatic-cell fusion with ES cells. However, iPS cell reprogramming remains slow and inefficient. Notably, no live animals have been produced by the most stringent tetraploid complementation assay, indicative of a failure to create fully pluripotent cells. Here we report the generation of several iPS cell lines that are capable of generating viable, fertile live-born progeny by tetraploid complementation. These iPS cells maintain a pluripotent potential that is very close to ES cells generated from in vivo or nuclear transfer embryos. We demonstrate the practicality of using iPS cells as useful tools for the characterization of cellular reprogramming and developmental potency, and confirm that iPS cells can attain true pluripotency that is similar to that of ES cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhao, Xiao-yang -- Li, Wei -- Lv, Zhuo -- Liu, Lei -- Tong, Man -- Hai, Tang -- Hao, Jie -- Guo, Chang-long -- Ma, Qing-wen -- Wang, Liu -- Zeng, Fanyi -- Zhou, Qi -- England -- Nature. 2009 Sep 3;461(7260):86-90. doi: 10.1038/nature08267.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19672241" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blastocyst/cytology/physiology ; Cell Dedifferentiation/physiology ; Cell Line ; Cell Lineage ; Cellular Reprogramming ; Embryo, Mammalian/cytology/embryology/metabolism ; Embryonic Stem Cells/cytology/physiology ; Female ; Fibroblasts/cytology ; Gene Expression Profiling ; Genetic Complementation Test ; Male ; Mice ; Mice, SCID ; Pluripotent Stem Cells/cytology/*physiology ; *Polyploidy ; Pregnancy ; *Reproductive Techniques ; Survival Rate ; Teratoma
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  • 32
    Publication Date: 2009-12-17
    Description: Male animals are typically more elaborately ornamented than females. Classic sexual selection theory notes that because sperm are cheaper to produce than eggs, and because males generally compete more intensely for reproductive opportunities and invest less in parental care than females, males can obtain greater fitness benefits from mating multiply. Therefore, sexual selection typically results in male-biased sex differences in secondary sexual characters. This generality has recently been questioned, because in cooperatively breeding vertebrates, the strength of selection on traits used in intrasexual competition for access to mates (sexual selection) or other resources linked to reproduction (social selection) is similar in males and females. Because selection is acting with comparable intensity in both sexes in cooperatively breeding species, the degree of sexual dimorphism in traits used in intrasexual competition should be reduced in cooperative breeders. Here we use the socially diverse African starlings (Sturnidae) to demonstrate that the degree of sexual dimorphism in plumage and body size is reduced in cooperatively breeding species as a result of increased selection on females for traits that increase access to reproductive opportunities, other resources, or higher social status. In cooperative breeders such as these, where there is unequal sharing of reproduction (reproductive skew) among females, and where female dominance rank influences access to mates and other resources, intrasexual competition among females may be intense and ultimately select for female trait elaboration. Selection is thereby acting with different intensities on males and females in cooperatively versus non-cooperatively breeding species, and female-female interactions in group-living vertebrates will have important consequences for the evolution of female morphological, physiological and behavioural traits.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rubenstein, Dustin R -- Lovette, Irby J -- England -- Nature. 2009 Dec 10;462(7274):786-9. doi: 10.1038/nature08614.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Columbia University, Department of Ecology, Evolution and Environmental Biology, 10th Floor Schermerhorn Extension, 1200 Amsterdam Avenue, New York, New York 10027, USA. dr2497@columbia.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20010686" target="_blank"〉PubMed〈/a〉
    Keywords: Africa ; Animals ; Bayes Theorem ; Body Size/physiology ; Competitive Behavior ; Cooperative Behavior ; Feathers/anatomy & histology/physiology ; Female ; Male ; Markov Chains ; Mating Preference, Animal/*physiology ; Monte Carlo Method ; Phylogeny ; Reproduction/*physiology ; Selection, Genetic ; *Sex Characteristics ; *Social Behavior ; Social Dominance ; Starlings/*anatomy & histology/*physiology ; Wings, Animal/anatomy & histology
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  • 33
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    Nature Publishing Group (NPG)
    Publication Date: 2009-01-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2009 Jan 15;457(7227):236. doi: 10.1038/457236a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19148049" target="_blank"〉PubMed〈/a〉
    Keywords: *Acquired Immunodeficiency Syndrome/drug ; therapy/economics/epidemiology/prevention & control ; *Federal Government ; Female ; Humans ; International Cooperation ; *Leadership ; Male ; Sexual Abstinence ; United States/epidemiology
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  • 34
    Publication Date: 2009-06-06
    Description: Most protein mutations, and mutations that alter protein functions in particular, undermine stability and are therefore deleterious. Chaperones, or heat-shock proteins, are often implicated in buffering mutations, and could thus facilitate the acquisition of neutral genetic diversity and the rate of adaptation. We examined the ability of the Escherichia coli GroEL/GroES chaperonins to buffer destabilizing and adaptive mutations. Here we show that mutational drifts performed in vitro with four different enzymes indicated that GroEL/GroES overexpression doubled the number of accumulating mutations, and promoted the folding of enzyme variants carrying mutations in the protein core and/or mutations with higher destabilizing effects (destabilization energies of 〉3.5 kcal mol(-)(1), on average, versus approximately 1 kcal mol(-)(1) in the absence of GroEL/GroES). The divergence of modified enzymatic specificity occurred much faster under GroEL/GroES overexpression, in terms of the number of adapted variants (〉or=2-fold) and their improved specificity and activity (〉or=10-fold). These results indicate that protein stability is a major constraint in protein evolution, and buffering mechanisms such as chaperonins are key in alleviating this constraint.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tokuriki, Nobuhiko -- Tawfik, Dan S -- W81XWH-07-2-0020/PHS HHS/ -- England -- Nature. 2009 Jun 4;459(7247):668-73. doi: 10.1038/nature08009.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19494908" target="_blank"〉PubMed〈/a〉
    Keywords: Chaperonin 10/genetics/metabolism ; Chaperonin 60/genetics/metabolism ; Chaperonins/*metabolism ; Escherichia coli/*genetics/*metabolism ; Esterases/metabolism ; *Evolution, Molecular ; *Gene Expression ; *Genetic Variation ; Glyceraldehyde-3-Phosphate Dehydrogenases/metabolism ; Humans ; Mutation ; Protein Stability ; Pseudomonas/enzymology ; Substrate Specificity
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  • 35
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    Nature Publishing Group (NPG)
    Publication Date: 2009-11-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Todes, Daniel -- England -- Nature. 2009 Nov 5;462(7269):36-7. doi: 10.1038/462036a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of the History of Medicine at Johns Hopkins University, 1900 East Monument Street, Baltimore, Maryland 21205, USA. dtodes@jhmi.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19890312" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Biological Science Disciplines/*history ; *Competitive Behavior ; Cooperative Behavior ; *Cultural Diversity ; Food Supply ; Great Britain ; History, 19th Century ; History, 20th Century ; Humans ; Literature, Modern/history ; Metaphor ; Models, Biological ; Population Density ; Russia ; Selection, Genetic
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  • 36
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    Nature Publishing Group (NPG)
    Publication Date: 2009-07-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Toledo, Franck -- Bardot, Boris -- England -- Nature. 2009 Jul 23;460(7254):466-7. doi: 10.1038/460466a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19626103" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Gene Expression Regulation, Neoplastic ; Genes, p53/genetics/*physiology ; Humans ; Mice ; MicroRNAs/*metabolism ; Mutation ; Neoplasms/*metabolism
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  • 37
    Publication Date: 2009-12-18
    Description: Effects of susceptibility variants may depend on from which parent they are inherited. Although many associations between sequence variants and human traits have been discovered through genome-wide associations, the impact of parental origin has largely been ignored. Here we show that for 38,167 Icelanders genotyped using single nucleotide polymorphism (SNP) chips, the parental origin of most alleles can be determined. For this we used a combination of genealogy and long-range phasing. We then focused on SNPs that associate with diseases and are within 500 kilobases of known imprinted genes. Seven independent SNP associations were examined. Five-one with breast cancer, one with basal-cell carcinoma and three with type 2 diabetes-have parental-origin-specific associations. These variants are located in two genomic regions, 11p15 and 7q32, each harbouring a cluster of imprinted genes. Furthermore, we observed a novel association between the SNP rs2334499 at 11p15 and type 2 diabetes. Here the allele that confers risk when paternally inherited is protective when maternally transmitted. We identified a differentially methylated CTCF-binding site at 11p15 and demonstrated correlation of rs2334499 with decreased methylation of that site.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3746295/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3746295/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kong, Augustine -- Steinthorsdottir, Valgerdur -- Masson, Gisli -- Thorleifsson, Gudmar -- Sulem, Patrick -- Besenbacher, Soren -- Jonasdottir, Aslaug -- Sigurdsson, Asgeir -- Kristinsson, Kari Th -- Jonasdottir, Adalbjorg -- Frigge, Michael L -- Gylfason, Arnaldur -- Olason, Pall I -- Gudjonsson, Sigurjon A -- Sverrisson, Sverrir -- Stacey, Simon N -- Sigurgeirsson, Bardur -- Benediktsdottir, Kristrun R -- Sigurdsson, Helgi -- Jonsson, Thorvaldur -- Benediktsson, Rafn -- Olafsson, Jon H -- Johannsson, Oskar Th -- Hreidarsson, Astradur B -- Sigurdsson, Gunnar -- DIAGRAM Consortium -- Ferguson-Smith, Anne C -- Gudbjartsson, Daniel F -- Thorsteinsdottir, Unnur -- Stefansson, Kari -- 077016/Wellcome Trust/United Kingdom -- 090532/Wellcome Trust/United Kingdom -- G9723500/Medical Research Council/United Kingdom -- K08 AR055688/AR/NIAMS NIH HHS/ -- MC_U106179471/Medical Research Council/United Kingdom -- MC_U106179474/Medical Research Council/United Kingdom -- MC_U127592696/Medical Research Council/United Kingdom -- R01 DK029867/DK/NIDDK NIH HHS/ -- England -- Nature. 2009 Dec 17;462(7275):868-74. doi: 10.1038/nature08625.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉deCODE genetics, Sturlugata 8, 101 Reykjavik, Iceland. kong@decode.is〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20016592" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Binding Sites ; Breast Neoplasms/genetics ; Carcinoma, Basal Cell/genetics ; Chromosomes, Human, Pair 11/genetics ; Chromosomes, Human, Pair 7/genetics ; DNA Methylation/genetics ; Diabetes Mellitus, Type 2/genetics ; *Fathers ; Female ; Genetic Predisposition to Disease/*genetics ; Genome, Human/genetics ; Genomic Imprinting/genetics ; Haplotypes ; Humans ; Iceland ; Male ; *Mothers ; Pedigree ; Polymorphism, Single Nucleotide/*genetics ; Repressor Proteins/metabolism
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  • 38
    Publication Date: 2009-05-09
    Description: Translation elongation factors facilitate protein synthesis by the ribosome. Previous studies identified two universally conserved translation elongation factors, EF-Tu in bacteria (known as eEF1A in eukaryotes) and EF-G (eEF2), which deliver aminoacyl-tRNAs to the ribosome and promote ribosomal translocation, respectively. The factor eIF5A (encoded by HYP2 and ANB1 in Saccharomyces cerevisiae), the sole protein in eukaryotes and archaea to contain the unusual amino acid hypusine (N(epsilon)-(4-amino-2-hydroxybutyl)lysine), was originally identified based on its ability to stimulate the yield (endpoint) of methionyl-puromycin synthesis-a model assay for first peptide bond synthesis thought to report on certain aspects of translation initiation. Hypusine is required for eIF5A to associate with ribosomes and to stimulate methionyl-puromycin synthesis. Because eIF5A did not stimulate earlier steps of translation initiation, and depletion of eIF5A in yeast only modestly impaired protein synthesis, it was proposed that eIF5A function was limited to stimulating synthesis of the first peptide bond or that eIF5A functioned on only a subset of cellular messenger RNAs. However, the precise cellular role of eIF5A is unknown, and the protein has also been linked to mRNA decay, including the nonsense-mediated mRNA decay pathway, and to nucleocytoplasmic transport. Here we use molecular genetic and biochemical studies to show that eIF5A promotes translation elongation. Depletion or inactivation of eIF5A in the yeast S. cerevisiae resulted in the accumulation of polysomes and an increase in ribosomal transit times. Addition of recombinant eIF5A from yeast, but not a derivative lacking hypusine, enhanced the rate of tripeptide synthesis in vitro. Moreover, inactivation of eIF5A mimicked the effects of the eEF2 inhibitor sordarin, indicating that eIF5A might function together with eEF2 to promote ribosomal translocation. Because eIF5A is a structural homologue of the bacterial protein EF-P, we propose that eIF5A/EF-P is a universally conserved translation elongation factor.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3140696/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3140696/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Saini, Preeti -- Eyler, Daniel E -- Green, Rachel -- Dever, Thomas E -- Z01 HD001010-14/Intramural NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2009 May 7;459(7243):118-21. doi: 10.1038/nature08034.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Gene Regulation and Development, NICHD, National Institutes of Health, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19424157" target="_blank"〉PubMed〈/a〉
    Keywords: Indenes/pharmacology ; Lysine/*analogs & derivatives ; Mutation ; Peptide Chain Elongation, Translational/*physiology ; Peptide Elongation Factors/*metabolism ; Peptide Initiation Factors/chemistry/*metabolism ; Polyribosomes/metabolism ; Protein Synthesis Inhibitors/pharmacology ; RNA-Binding Proteins/chemistry/*metabolism ; Recombinant Proteins/metabolism ; Saccharomyces cerevisiae/*genetics/growth & development/*metabolism
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  • 39
    Publication Date: 2009-10-09
    Description: PIWI-interacting RNAs (piRNAs) silence retrotransposons in Drosophila germ lines by associating with the PIWI proteins Argonaute 3 (AGO3), Aubergine (Aub) and Piwi. piRNAs in Drosophila are produced from intergenic repetitive genes and piRNA clusters by two systems: the primary processing pathway and the amplification loop. The amplification loop occurs in a Dicer-independent, PIWI-Slicer-dependent manner. However, primary piRNA processing remains elusive. Here we analysed piRNA processing in a Drosophila ovarian somatic cell line where Piwi, but not Aub or AGO3, is expressed; thus, only the primary piRNAs exist. In addition to flamenco, a Piwi-specific piRNA cluster, traffic jam (tj), a large Maf gene, was determined as a new piRNA cluster. piRNAs arising from tj correspond to the untranslated regions of tj messenger RNA and are sense-oriented. piRNA loading on to Piwi may occur in the cytoplasm. zucchini, a gene encoding a putative cytoplasmic nuclease, is required for tj-derived piRNA production. In tj and piwi mutant ovaries, somatic cells fail to intermingle with germ cells and Fasciclin III is overexpressed. Loss of tj abolishes Piwi expression in gonadal somatic cells. Thus, in gonadal somatic cells, tj gives rise simultaneously to two different molecules: the TJ protein, which activates Piwi expression, and piRNAs, which define the Piwi targets for silencing.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Saito, Kuniaki -- Inagaki, Sachi -- Mituyama, Toutai -- Kawamura, Yoshinori -- Ono, Yukiteru -- Sakota, Eri -- Kotani, Hazuki -- Asai, Kiyoshi -- Siomi, Haruhiko -- Siomi, Mikiko C -- England -- Nature. 2009 Oct 29;461(7268):1296-9. doi: 10.1038/nature08501. Epub 2009 Oct 7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Keio University School of Medicine, Tokyo 160-8582, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19812547" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Argonaute Proteins ; Cell Adhesion Molecules, Neuronal/metabolism ; Cell Line ; Drosophila Proteins/genetics/*metabolism ; Drosophila melanogaster/genetics/*metabolism ; Endoribonucleases/metabolism ; Female ; Genes, Insect/genetics ; Genetic Loci/genetics ; Maf Transcription Factors, Large/genetics/*metabolism ; Male ; Ovary/cytology/metabolism ; Phenotype ; Proto-Oncogene Proteins/genetics/*metabolism ; RNA/biosynthesis/genetics/*metabolism ; RNA Interference ; RNA Processing, Post-Transcriptional ; RNA-Induced Silencing Complex/genetics/*metabolism ; Testis/cytology/metabolism
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  • 40
    Publication Date: 2009-10-23
    Description: The tendency of organisms to reproduce by cross-fertilization despite numerous disadvantages relative to self-fertilization is one of the oldest puzzles in evolutionary biology. For many species, the primary obstacle to the evolution of outcrossing is the cost of production of males, individuals that do not directly contribute offspring and thus diminish the long-term reproductive output of a lineage. Self-fertilizing ('selfing') organisms do not incur the cost of males and therefore should possess at least a twofold numerical advantage over most outcrossing organisms. Two competing explanations for the widespread prevalence of outcrossing in nature despite this inherent disadvantage are the avoidance of inbreeding depression generated by selfing and the ability of outcrossing populations to adapt more rapidly to environmental change. Here we show that outcrossing is favoured in populations of Caenorhabditis elegans subject to experimental evolution both under conditions of increased mutation rate and during adaptation to a novel environment. In general, fitness increased with increasing rates of outcrossing. Thus, each of the standard explanations for the maintenance of outcrossing are correct, and it is likely that outcrossing is the predominant mode of reproduction in most species because it is favoured under ecological conditions that are ubiquitous in natural environments.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4183137/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4183137/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Morran, Levi T -- Parmenter, Michelle D -- Phillips, Patrick C -- T32 GM007413/GM/NIGMS NIH HHS/ -- England -- Nature. 2009 Nov 19;462(7271):350-2. doi: 10.1038/nature08496. Epub 2009 Oct 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Ecology & Evolutionary Biology, 5289 University of Oregon, Eugene, Oregon 97403-5289, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19847164" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptation, Biological ; Animals ; Biological Evolution ; Caenorhabditis elegans/genetics/*physiology ; *Crosses, Genetic ; *Inbreeding ; Male ; Mutation/*genetics
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  • 41
    Publication Date: 2009-04-17
    Description: During cell division microtubules capture chromosomes by binding to the kinetochore assembled in the centromeric region of chromosomes. In mitosis sister chromatids are captured by microtubules emanating from both spindle poles, a process called bipolar attachment, whereas in meiosis I sisters are attached to microtubules originating from one spindle pole, called monopolar attachment. For determining chromosome orientation, kinetochore geometry or structure might be an important target of regulation. However, the molecular basis of this regulation has remained elusive. Here we show the link between kinetochore orientation and cohesion within the centromere in fission yeast Schizosaccharomyces pombe by strategies developed to visualize the concealed cohesion within the centromere, and to introduce artificial tethers that can influence kinetochore geometry. Our data imply that cohesion at the core centromere induces the mono-orientation of kinetochores whereas cohesion at the peri-centromeric region promotes bi-orientation. Our study may reveal a general mechanism for the geometric regulation of kinetochores, which collaborates with previously defined tension-dependent reorientation machinery.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sakuno, Takeshi -- Tada, Kenji -- Watanabe, Yoshinori -- England -- Nature. 2009 Apr 16;458(7240):852-8. doi: 10.1038/nature07876.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Chromosome Dynamics, Institute of Molecular and Cellular Biosciences, University of Tokyo, Yayoi, Tokyo 113-0032, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19370027" target="_blank"〉PubMed〈/a〉
    Keywords: Centromere/genetics/*metabolism ; Chromosome Segregation ; Kinetochores/*metabolism ; Meiosis ; Microtubules/metabolism ; Mitosis ; Models, Biological ; Schizosaccharomyces/*cytology
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  • 42
    Publication Date: 2009-02-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Abate-Shen, Cory -- Shen, Michael M -- England -- Nature. 2009 Feb 12;457(7231):799-800. doi: 10.1038/457799a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19212391" target="_blank"〉PubMed〈/a〉
    Keywords: Biomarkers/metabolism ; Humans ; Male ; *Metabolome ; Prostatic Neoplasms/*diagnosis ; Sarcosine/metabolism
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  • 43
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    Nature Publishing Group (NPG)
    Publication Date: 2009-12-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dolgin, Elie -- England -- Nature. 2009 Dec 17;462(7275):843-5. doi: 10.1038/462843a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20016572" target="_blank"〉PubMed〈/a〉
    Keywords: Female ; Genome, Human/*genetics ; History, 20th Century ; History, 21st Century ; *Human Genome Project/history ; Humans ; Male ; Reproducibility of Results ; Research Design ; *Research Personnel ; Research Subjects
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  • 44
    Publication Date: 2009-01-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Abbondanzieri, Elio A -- Zhuang, Xiaowei -- England -- Nature. 2009 Jan 22;457(7228):392-3. doi: 10.1038/457392a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19158782" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphatases/*chemistry/*metabolism ; Bacillus Phages/*enzymology ; DNA, Viral/chemistry/metabolism ; Hydrolysis ; Models, Biological ; Protein Structure, Quaternary ; Protein Subunits/chemistry/metabolism ; Virus Assembly
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  • 45
    Publication Date: 2009-07-22
    Description: Acquired uniparental disomy (aUPD) is a common feature of cancer genomes, leading to loss of heterozygosity. aUPD is associated not only with loss-of-function mutations of tumour suppressor genes, but also with gain-of-function mutations of proto-oncogenes. Here we show unique gain-of-function mutations of the C-CBL (also known as CBL) tumour suppressor that are tightly associated with aUPD of the 11q arm in myeloid neoplasms showing myeloproliferative features. The C-CBL proto-oncogene, a cellular homologue of v-Cbl, encodes an E3 ubiquitin ligase and negatively regulates signal transduction of tyrosine kinases. Homozygous C-CBL mutations were found in most 11q-aUPD-positive myeloid malignancies. Although the C-CBL mutations were oncogenic in NIH3T3 cells, c-Cbl was shown to functionally and genetically act as a tumour suppressor. C-CBL mutants did not have E3 ubiquitin ligase activity, but inhibited that of wild-type C-CBL and CBL-B (also known as CBLB), leading to prolonged activation of tyrosine kinases after cytokine stimulation. c-Cbl(-/-) haematopoietic stem/progenitor cells (HSPCs) showed enhanced sensitivity to a variety of cytokines compared to c-Cbl(+/+) HSPCs, and transduction of C-CBL mutants into c-Cbl(-/-) HSPCs further augmented their sensitivities to a broader spectrum of cytokines, including stem-cell factor (SCF, also known as KITLG), thrombopoietin (TPO, also known as THPO), IL3 and FLT3 ligand (FLT3LG), indicating the presence of a gain-of-function that could not be attributed to a simple loss-of-function. The gain-of-function effects of C-CBL mutants on cytokine sensitivity of HSPCs largely disappeared in a c-Cbl(+/+) background or by co-transduction of wild-type C-CBL, which suggests the pathogenic importance of loss of wild-type C-CBL alleles found in most cases of C-CBL-mutated myeloid neoplasms. Our findings provide a new insight into a role of gain-of-function mutations of a tumour suppressor associated with aUPD in the pathogenesis of some myeloid cancer subsets.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sanada, Masashi -- Suzuki, Takahiro -- Shih, Lee-Yung -- Otsu, Makoto -- Kato, Motohiro -- Yamazaki, Satoshi -- Tamura, Azusa -- Honda, Hiroaki -- Sakata-Yanagimoto, Mamiko -- Kumano, Keiki -- Oda, Hideaki -- Yamagata, Tetsuya -- Takita, Junko -- Gotoh, Noriko -- Nakazaki, Kumi -- Kawamata, Norihiko -- Onodera, Masafumi -- Nobuyoshi, Masaharu -- Hayashi, Yasuhide -- Harada, Hiroshi -- Kurokawa, Mineo -- Chiba, Shigeru -- Mori, Hiraku -- Ozawa, Keiya -- Omine, Mitsuhiro -- Hirai, Hisamaru -- Nakauchi, Hiromitsu -- Koeffler, H Phillip -- Ogawa, Seishi -- 2R01CA026038-30/CA/NCI NIH HHS/ -- England -- Nature. 2009 Aug 13;460(7257):904-8. doi: 10.1038/nature08240. Epub 2009 Jul 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cancer Genomics Project, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19620960" target="_blank"〉PubMed〈/a〉
    Keywords: Allelic Imbalance ; Amino Acid Sequence ; Animals ; Base Sequence ; Chromosomes, Human, Pair 11/genetics ; Female ; *Genes, Tumor Suppressor ; Humans ; Leukemia, Myeloid/*genetics/metabolism/pathology ; Male ; Mice ; Mice, Knockout ; Mice, Nude ; Models, Molecular ; Molecular Sequence Data ; Mutant Proteins/chemistry/genetics/*metabolism ; Mutation ; NIH 3T3 Cells ; Neoplasm Transplantation ; Oncogenes/genetics ; Phosphorylation ; Protein Conformation ; Proto-Oncogene Proteins c-cbl/antagonists & ; inhibitors/chemistry/deficiency/*genetics/*metabolism ; Ubiquitination ; Uniparental Disomy/genetics ; ras Proteins/genetics/metabolism
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  • 46
    Publication Date: 2009-06-10
    Description: The plant signalling molecule auxin provides positional information in a variety of developmental processes by means of its differential distribution (gradients) within plant tissues. Thus, cellular auxin levels often determine the developmental output of auxin signalling. Conceptually, transmembrane transport and metabolic processes regulate the steady-state levels of auxin in any given cell. In particular, PIN auxin-efflux-carrier-mediated, directional transport between cells is crucial for generating auxin gradients. Here we show that Arabidopsis thaliana PIN5, an atypical member of the PIN gene family, encodes a functional auxin transporter that is required for auxin-mediated development. PIN5 does not have a direct role in cell-to-cell transport but regulates intracellular auxin homeostasis and metabolism. PIN5 localizes, unlike other characterized plasma membrane PIN proteins, to endoplasmic reticulum (ER), presumably mediating auxin flow from the cytosol to the lumen of the ER. The ER localization of other PIN5-like transporters (including the moss PIN) indicates that the diversification of PIN protein functions in mediating auxin homeostasis at the ER, and cell-to-cell auxin transport at the plasma membrane, represent an ancient event during the evolution of land plants.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mravec, Jozef -- Skupa, Petr -- Bailly, Aurelien -- Hoyerova, Klara -- Krecek, Pavel -- Bielach, Agnieszka -- Petrasek, Jan -- Zhang, Jing -- Gaykova, Vassilena -- Stierhof, York-Dieter -- Dobrev, Petre I -- Schwarzerova, Katerina -- Rolcik, Jakub -- Seifertova, Daniela -- Luschnig, Christian -- Benkova, Eva -- Zazimalova, Eva -- Geisler, Markus -- Friml, Jiri -- P 19585/Austrian Science Fund FWF/Austria -- England -- Nature. 2009 Jun 25;459(7250):1136-40. doi: 10.1038/nature08066. Epub 2009 Jun 7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Plant Systems Biology, VIB and Department of Plant Biotechnology and Genetics, Ghent University, 9052 Gent, Belgium.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19506555" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/classification/genetics/metabolism/*physiology ; Arabidopsis Proteins/genetics/*metabolism ; Cells, Cultured ; Endoplasmic Reticulum/*metabolism ; Gene Knockout Techniques ; Homeostasis/*physiology ; Indoleacetic Acids/*metabolism ; Membrane Transport Proteins/genetics/*metabolism ; Mutation ; Phenotype ; Phylogeny ; Plant Growth Regulators/metabolism
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  • 47
    Publication Date: 2009-06-16
    Description: Because nucleosomes are widely replaced by protamine in mature human sperm, the epigenetic contributions of sperm chromatin to embryo development have been considered highly limited. Here we show that the retained nucleosomes are significantly enriched at loci of developmental importance, including imprinted gene clusters, microRNA clusters, HOX gene clusters, and the promoters of stand-alone developmental transcription and signalling factors. Notably, histone modifications localize to particular developmental loci. Dimethylated lysine 4 on histone H3 (H3K4me2) is enriched at certain developmental promoters, whereas large blocks of H3K4me3 localize to a subset of developmental promoters, regions in HOX clusters, certain noncoding RNAs, and generally to paternally expressed imprinted loci, but not paternally repressed loci. Notably, trimethylated H3K27 (H3K27me3) is significantly enriched at developmental promoters that are repressed in early embryos, including many bivalent (H3K4me3/H3K27me3) promoters in embryonic stem cells. Furthermore, developmental promoters are generally DNA hypomethylated in sperm, but acquire methylation during differentiation. Taken together, epigenetic marking in sperm is extensive, and correlated with developmental regulators.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2858064/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2858064/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hammoud, Saher Sue -- Nix, David A -- Zhang, Haiying -- Purwar, Jahnvi -- Carrell, Douglas T -- Cairns, Bradley R -- CA16056/CA/NCI NIH HHS/ -- CA24014/CA/NCI NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2009 Jul 23;460(7254):473-8. doi: 10.1038/nature08162. Epub 2009 Jun 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Oncological Sciences, University of Utah School of Medicine, Salt Lake City, Utah 84112, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19525931" target="_blank"〉PubMed〈/a〉
    Keywords: Chromatin/*metabolism ; DNA Methylation ; Embryo, Mammalian/embryology ; Gene Expression Regulation, Developmental ; Genes/*genetics ; Genes, Homeobox/genetics ; Genomic Imprinting ; Genomics ; Humans ; Male ; MicroRNAs/genetics ; Multigene Family/genetics ; Nucleosomes/*metabolism ; Promoter Regions, Genetic ; Protamines/metabolism ; Spermatozoa/*metabolism
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  • 48
    Publication Date: 2009-11-27
    Description: Receptor-activator of NF-kappaB ligand (TNFSF11, also known as RANKL, OPGL, TRANCE and ODF) and its tumour necrosis factor (TNF)-family receptor RANK are essential regulators of bone remodelling, lymph node organogenesis and formation of a lactating mammary gland. RANKL and RANK are also expressed in the central nervous system. However, the functional relevance of RANKL/RANK in the brain was entirely unknown. Here we report that RANKL and RANK have an essential role in the brain. In both mice and rats, central RANKL injections trigger severe fever. Using tissue-specific Nestin-Cre and GFAP-Cre rank(floxed) deleter mice, the function of RANK in the fever response was genetically mapped to astrocytes. Importantly, Nestin-Cre and GFAP-Cre rank(floxed) deleter mice are resistant to lipopolysaccharide-induced fever as well as fever in response to the key inflammatory cytokines IL-1beta and TNFalpha. Mechanistically, RANKL activates brain regions involved in thermoregulation and induces fever via the COX2-PGE(2)/EP3R pathway. Moreover, female Nestin-Cre and GFAP-Cre rank(floxed) mice exhibit increased basal body temperatures, suggesting that RANKL and RANK control thermoregulation during normal female physiology. We also show that two children with RANK mutations exhibit impaired fever during pneumonia. These data identify an entirely novel and unexpected function for the key osteoclast differentiation factors RANKL/RANK in female thermoregulation and the central fever response in inflammation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hanada, Reiko -- Leibbrandt, Andreas -- Hanada, Toshikatsu -- Kitaoka, Shiho -- Furuyashiki, Tomoyuki -- Fujihara, Hiroaki -- Trichereau, Jean -- Paolino, Magdalena -- Qadri, Fatimunnisa -- Plehm, Ralph -- Klaere, Steffen -- Komnenovic, Vukoslav -- Mimata, Hiromitsu -- Yoshimatsu, Hironobu -- Takahashi, Naoyuki -- von Haeseler, Arndt -- Bader, Michael -- Kilic, Sara Sebnem -- Ueta, Yoichi -- Pifl, Christian -- Narumiya, Shuh -- Penninger, Josef M -- England -- Nature. 2009 Nov 26;462(7272):505-9. doi: 10.1038/nature08596.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉IMBA, Institute of Molecular Biotechnology of the Austrian Academy of Sciences, 1030 Vienna, Austria.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19940926" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Astrocytes/drug effects/metabolism ; Body Temperature Regulation/*drug effects/*physiology ; Child ; Dinoprostone/metabolism ; Female ; Fever/*chemically induced/complications/*metabolism ; Gene Expression Profiling ; Humans ; Injections, Intraventricular ; Male ; Mice ; Mice, Inbred C57BL ; Pneumonia/complications/metabolism ; RANK Ligand/administration & dosage/antagonists & ; inhibitors/metabolism/*pharmacology ; Rats ; Rats, Wistar ; Receptor Activator of Nuclear Factor-kappa B/genetics/*metabolism ; Receptors, Prostaglandin E/metabolism ; Receptors, Prostaglandin E, EP3 Subtype ; *Sex Characteristics
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  • 49
    Publication Date: 2009-06-19
    Description: Pluripotency of embryonic stem (ES) cells is controlled by defined transcription factors. During differentiation, mouse ES cells undergo global epigenetic reprogramming, as exemplified by X-chromosome inactivation (XCI) in which one female X chromosome is silenced to achieve gene dosage parity between the sexes. Somatic XCI is regulated by homologous X-chromosome pairing and counting, and by the random choice of future active and inactive X chromosomes. XCI and cell differentiation are tightly coupled, as blocking one process compromises the other and dedifferentiation of somatic cells to induced pluripotent stem cells is accompanied by X chromosome reactivation. Recent evidence suggests coupling of Xist expression to pluripotency factors occurs, but how the two are interconnected remains unknown. Here we show that Oct4 (also known as Pou5f1) lies at the top of the XCI hierarchy, and regulates XCI by triggering X-chromosome pairing and counting. Oct4 directly binds Tsix and Xite, two regulatory noncoding RNA genes of the X-inactivation centre, and also complexes with XCI trans-factors, Ctcf and Yy1 (ref. 17), through protein-protein interactions. Depletion of Oct4 blocks homologous X-chromosome pairing and results in the inactivation of both X chromosomes in female cells. Thus, we have identified the first trans-factor that regulates counting, and ascribed new functions to Oct4 during X-chromosome reprogramming.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3057664/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3057664/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Donohoe, Mary E -- Silva, Susana S -- Pinter, Stefan F -- Xu, Na -- Lee, Jeannie T -- GM58839/GM/NIGMS NIH HHS/ -- R01 GM058839/GM/NIGMS NIH HHS/ -- R01 GM058839-10/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2009 Jul 2;460(7251):128-32. doi: 10.1038/nature08098. Epub 2009 Jun 17.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19536159" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; *Chromosome Pairing ; Female ; Humans ; Male ; Mice ; Octamer Transcription Factor-3/deficiency/genetics/*metabolism ; Protein Binding ; RNA, Long Noncoding ; RNA, Untranslated/genetics ; Repressor Proteins/*metabolism ; SOXB1 Transcription Factors ; Transcriptional Activation ; X Chromosome/*genetics/*metabolism ; X Chromosome Inactivation/*genetics ; YY1 Transcription Factor/metabolism
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  • 50
    Publication Date: 2009-02-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Muller-Landau, Helene C -- England -- Nature. 2009 Feb 19;457(7232):969-70. doi: 10.1038/457969a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19225510" target="_blank"〉PubMed〈/a〉
    Keywords: Africa ; Atmosphere/chemistry ; Biomass ; Carbon/analysis/*metabolism ; Carbon Dioxide/analysis/metabolism ; Models, Biological ; Trees/chemistry/growth & development/*metabolism ; *Tropical Climate ; Wilderness
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  • 51
    Publication Date: 2009-11-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dulvy, Nicholas K -- Reynolds, John D -- England -- Nature. 2009 Nov 26;462(7272):417. doi: 10.1038/462417a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19940904" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Classification ; Ecosystem ; *Endangered Species/trends ; Male ; Skates (Fish)/anatomy & histology/*classification
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  • 52
    Publication Date: 2009-08-08
    Description: During the twentieth century, the global population has gone through unprecedented increases in economic and social development that coincided with substantial declines in human fertility and population growth rates. The negative association of fertility with economic and social development has therefore become one of the most solidly established and generally accepted empirical regularities in the social sciences. As a result of this close connection between development and fertility decline, more than half of the global population now lives in regions with below-replacement fertility (less than 2.1 children per woman). In many highly developed countries, the trend towards low fertility has also been deemed irreversible. Rapid population ageing, and in some cases the prospect of significant population decline, have therefore become a central socioeconomic concern and policy challenge. Here we show, using new cross-sectional and longitudinal analyses of the total fertility rate and the human development index (HDI), a fundamental change in the well-established negative relationship between fertility and development as the global population entered the twenty-first century. Although development continues to promote fertility decline at low and medium HDI levels, our analyses show that at advanced HDI levels, further development can reverse the declining trend in fertility. The previously negative development-fertility relationship has become J-shaped, with the HDI being positively associated with fertility among highly developed countries. This reversal of fertility decline as a result of continued economic and social development has the potential to slow the rates of population ageing, thereby ameliorating the social and economic problems that have been associated with the emergence and persistence of very low fertility.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Myrskyla, Mikko -- Kohler, Hans-Peter -- Billari, Francesco C -- England -- Nature. 2009 Aug 6;460(7256):741-3. doi: 10.1038/nature08230.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Population Studies Center, University of Pennsylvania, 3718 Locust Walk, Philadelphia, Pennsylvania 19104, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19661915" target="_blank"〉PubMed〈/a〉
    Keywords: Age Distribution ; *Birth Rate/trends ; Cross-Sectional Studies ; Developed Countries/economics/*statistics & numerical data ; Education ; Female ; Fertility/physiology ; History, 20th Century ; History, 21st Century ; Humans ; Income ; Life Expectancy ; Longitudinal Studies ; Male ; Maternal Age ; *Population Growth ; Reproductive Behavior/history/*statistics & numerical data ; Technology/history/statistics & numerical data/trends
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  • 53
    Publication Date: 2009-03-06
    Description: AMP-activated protein kinase (AMPK) is a metabolic fuel gauge conserved along the evolutionary scale in eukaryotes that senses changes in the intracellular AMP/ATP ratio. Recent evidence indicated an important role for AMPK in the therapeutic benefits of metformin, thiazolidinediones and exercise, which form the cornerstones of the clinical management of type 2 diabetes and associated metabolic disorders. In general, activation of AMPK acts to maintain cellular energy stores, switching on catabolic pathways that produce ATP, mostly by enhancing oxidative metabolism and mitochondrial biogenesis, while switching off anabolic pathways that consume ATP. This regulation can take place acutely, through the regulation of fast post-translational events, but also by transcriptionally reprogramming the cell to meet energetic needs. Here we demonstrate that AMPK controls the expression of genes involved in energy metabolism in mouse skeletal muscle by acting in coordination with another metabolic sensor, the NAD+-dependent type III deacetylase SIRT1. AMPK enhances SIRT1 activity by increasing cellular NAD+ levels, resulting in the deacetylation and modulation of the activity of downstream SIRT1 targets that include the peroxisome proliferator-activated receptor-gamma coactivator 1alpha and the forkhead box O1 (FOXO1) and O3 (FOXO3a) transcription factors. The AMPK-induced SIRT1-mediated deacetylation of these targets explains many of the convergent biological effects of AMPK and SIRT1 on energy metabolism.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3616311/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3616311/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Canto, Carles -- Gerhart-Hines, Zachary -- Feige, Jerome N -- Lagouge, Marie -- Noriega, Lilia -- Milne, Jill C -- Elliott, Peter J -- Puigserver, Pere -- Auwerx, Johan -- 231138/European Research Council/International -- DK069966/DK/NIDDK NIH HHS/ -- DK59820/DK/NIDDK NIH HHS/ -- England -- Nature. 2009 Apr 23;458(7241):1056-60. doi: 10.1038/nature07813.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut de Genetique et de Biologie Moleculaire et Cellulaire, CNRS/INSERM/ULP, 67404 Illkirch, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19262508" target="_blank"〉PubMed〈/a〉
    Keywords: AMP-Activated Protein Kinases/*metabolism ; Acetylation ; Aminoimidazole Carboxamide/analogs & derivatives ; Animals ; Cell Line ; *Energy Metabolism/genetics ; Enzyme Activation ; Forkhead Transcription Factors/genetics ; Gene Expression Regulation ; Genes, Mitochondrial/genetics ; Male ; Mice ; Muscle, Skeletal/cytology/enzymology/metabolism ; Mutation ; NAD/*metabolism ; Oxygen Consumption ; Phosphorylation ; Ribonucleotides ; Sirtuin 1 ; Sirtuins/*metabolism ; Trans-Activators/genetics/metabolism ; Transcription Factors ; Transcription, Genetic
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  • 54
    Publication Date: 2009-11-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kuroiwa, Asato -- England -- Nature. 2009 Nov 5;462(7269):34. doi: 10.1038/462034b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19890307" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Avian Proteins/genetics ; Chick Embryo ; Chickens/*genetics ; Female ; Humans ; Male ; *Models, Biological ; Sex Chromosomes/genetics ; *Sex Determination Processes ; Testis/embryology/metabolism ; Transcription Factors/*genetics
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  • 55
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    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2009-02-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tonzani, Stefano -- England -- Nature. 2009 Feb 19;457(7232):974. doi: 10.1038/457974a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19225516" target="_blank"〉PubMed〈/a〉
    Keywords: Colloids/*chemistry ; *Magnetics ; Models, Biological ; Nanostructures/chemistry/ultrastructure ; Particle Size ; Water/chemistry
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  • 56
    Publication Date: 2009-04-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kutschera, U -- England -- Nature. 2009 Apr 23;458(7241):967. doi: 10.1038/458967c.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19396120" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; *Competitive Behavior ; Cooperative Behavior ; History, 19th Century ; Models, Biological ; *Selection, Genetic ; *Translating ; *Translations
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  • 57
    Publication Date: 2009-02-06
    Description: For a retrovirus such as HIV to be infectious, a properly formed capsid is needed; however, unusually among viruses, retrovirus capsids are highly variable in structure. According to the fullerene conjecture, they are composed of hexamers and pentamers of capsid protein (CA), with the shape of a capsid varying according to how the twelve pentamers are distributed and its size depending on the number of hexamers. Hexamers have been studied in planar and tubular arrays, but the predicted pentamers have not been observed. Here we report cryo-electron microscopic analyses of two in-vitro-assembled capsids of Rous sarcoma virus. Both are icosahedrally symmetric: one is composed of 12 pentamers, and the other of 12 pentamers and 20 hexamers. Fitting of atomic models of the two CA domains into the reconstructions shows three distinct inter-subunit interactions. These observations substantiate the fullerene conjecture, show how pentamers are accommodated at vertices, support the inference that nucleation is a crucial morphologic determinant, and imply that electrostatic interactions govern the differential assembly of pentamers and hexamers.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2721793/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2721793/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cardone, Giovanni -- Purdy, John G -- Cheng, Naiqian -- Craven, Rebecca C -- Steven, Alasdair C -- CA100322/CA/NCI NIH HHS/ -- R01 CA100322/CA/NCI NIH HHS/ -- R01 CA100322-05/CA/NCI NIH HHS/ -- Z01 AR027002-29/Intramural NIH HHS/ -- Z99 AR999999/Intramural NIH HHS/ -- England -- Nature. 2009 Feb 5;457(7230):694-8. doi: 10.1038/nature07724.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Structural Biology, National Institute for Arthritis, Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19194444" target="_blank"〉PubMed〈/a〉
    Keywords: Capsid/chemistry/*metabolism/*ultrastructure ; Capsid Proteins/chemistry/genetics/metabolism/ultrastructure ; Cryoelectron Microscopy ; HIV/chemistry/genetics/ultrastructure ; Models, Molecular ; Mutant Proteins/chemistry/genetics/metabolism/ultrastructure ; Mutation ; Polymorphism, Genetic ; Protein Multimerization ; Protein Structure, Quaternary ; Protein Subunits/chemistry/metabolism ; Rous sarcoma virus/*chemistry/genetics/*ultrastructure ; Static Electricity ; *Virus Assembly
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  • 58
    Publication Date: 2009-10-16
    Description: Language is a uniquely human ability that evolved at some point in the roughly 6,000,000 years since human and chimpanzee lines diverged. Even in the most linguistically impoverished environments, children naturally develop sophisticated language systems. In contrast, reading is a learnt skill that does not develop without intensive tuition and practice. Learning to read is likely to involve ontogenic structural brain changes, but these are nearly impossible to isolate in children owing to concurrent biological, environmental and social maturational changes. In Colombia, guerrillas are re-integrating into mainstream society and learning to read for the first time as adults. This presents a unique opportunity to investigate how literacy changes the brain, without the maturational complications present in children. Here we compare structural brain scans from those who learnt to read as adults (late-literates) with those from a carefully matched set of illiterates. Late-literates had more white matter in the splenium of the corpus callosum and more grey matter in bilateral angular, dorsal occipital, middle temporal, left supramarginal and superior temporal gyri. The importance of these brain regions for skilled reading was investigated in early literates, who learnt to read as children. We found anatomical connections linking the left and right angular and dorsal occipital gyri through the area of the corpus callosum where white matter was higher in late-literates than in illiterates; that reading, relative to object naming, increased the interhemispheric functional connectivity between the left and right angular gyri; and that activation in the left angular gyrus exerts top-down modulation on information flow from the left dorsal occipital gyrus to the left supramarginal gyrus. These findings demonstrate how the regions identified in late-literates interact during reading, relative to object naming, in early literates.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carreiras, Manuel -- Seghier, Mohamed L -- Baquero, Silvia -- Estevez, Adelina -- Lozano, Alfonso -- Devlin, Joseph T -- Price, Cathy J -- 082420/Wellcome Trust/United Kingdom -- Wellcome Trust/United Kingdom -- England -- Nature. 2009 Oct 15;461(7266):983-6. doi: 10.1038/nature08461.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Basque Center on Cognition Brain and Language, Donostia-San Sebastian 20009, Spain [2] IKERBASQUE, Basque Foundation for Science, Bilbao 48011, Spain. m.carreiras@bcbl.eu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19829380" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Aged ; Brain/*anatomy & histology/*physiology ; Child ; Colombia ; Corpus Callosum/anatomy & histology/physiology ; Educational Status ; Female ; Humans ; Language ; Magnetic Resonance Imaging ; Male ; Middle Aged ; Models, Neurological ; Neural Pathways/physiology ; *Reading ; Speech/physiology ; Young Adult
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  • 59
    Publication Date: 2009-10-02
    Description: Fas ligand (FasL), an apoptosis-inducing member of the TNF cytokine family, and its receptor Fas are critical for the shutdown of chronic immune responses and prevention of autoimmunity. Accordingly, mutations in their genes cause severe lymphadenopathy and autoimmune disease in mice and humans. FasL function is regulated by deposition in the plasma membrane and metalloprotease-mediated shedding. Here we generated gene-targeted mice that selectively lack either secreted FasL (sFasL) or membrane-bound FasL (mFasL) to resolve which of these forms is required for cell killing and to explore their hypothesized non-apoptotic activities. Mice lacking sFasL (FasL(Deltas/Deltas)) appeared normal and their T cells readily killed target cells, whereas T cells lacking mFasL (FasL(Deltam/Deltam)) could not kill cells through Fas activation. FasL(Deltam/Deltam) mice developed lymphadenopathy and hyper-gammaglobulinaemia, similar to FasL(gld/gld) mice, which express a mutant form of FasL that cannot bind Fas, but surprisingly, FasL(Deltam/Deltam) mice (on a C57BL/6 background) succumbed to systemic lupus erythematosus (SLE)-like autoimmune kidney destruction and histiocytic sarcoma, diseases that occur only rarely and much later in FasL(gld/gld) mice. These results demonstrate that mFasL is essential for cytotoxic activity and constitutes the guardian against lymphadenopathy, autoimmunity and cancer, whereas excess sFasL appears to promote autoimmunity and tumorigenesis through non-apoptotic activities.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2785124/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2785124/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉O' Reilly, Lorraine A -- Tai, Lin -- Lee, Lily -- Kruse, Elizabeth A -- Grabow, Stephanie -- Fairlie, W Douglas -- Haynes, Nicole M -- Tarlinton, David M -- Zhang, Jian-Guo -- Belz, Gabrielle T -- Smyth, Mark J -- Bouillet, Philippe -- Robb, Lorraine -- Strasser, Andreas -- CA043540-18/CA/NCI NIH HHS/ -- CA80188-6/CA/NCI NIH HHS/ -- R01 CA043540/CA/NCI NIH HHS/ -- R01 CA043540-18/CA/NCI NIH HHS/ -- R01 CA080188-06/CA/NCI NIH HHS/ -- England -- Nature. 2009 Oct 1;461(7264):659-63. doi: 10.1038/nature08402.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19794494" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Antinuclear/immunology ; Antigens, CD95/*metabolism ; *Apoptosis ; Cell Membrane/*metabolism ; Cytidine Deaminase/metabolism ; Cytotoxicity, Immunologic ; Fas Ligand Protein/deficiency/genetics/*metabolism/secretion ; Glomerulonephritis/metabolism ; Histiocytic Sarcoma/metabolism ; Hypergammaglobulinemia/metabolism ; Lupus Erythematosus, Systemic/metabolism ; Lymphatic Diseases/metabolism ; Mice ; Mice, Inbred C57BL ; Mutation ; Splenomegaly/metabolism ; T-Lymphocytes/immunology/metabolism
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  • 60
    Publication Date: 2009-12-17
    Description: The majority of excitatory synapses in the mammalian CNS (central nervous system) are formed on dendritic spines, and spine morphology and distribution are critical for synaptic transmission, synaptic integration and plasticity. Here, we show that a secreted semaphorin, Sema3F, is a negative regulator of spine development and synaptic structure. Mice with null mutations in genes encoding Sema3F, and its holoreceptor components neuropilin-2 (Npn-2, also known as Nrp2) and plexin A3 (PlexA3, also known as Plxna3), exhibit increased dentate gyrus (DG) granule cell (GC) and cortical layer V pyramidal neuron spine number and size, and also aberrant spine distribution. Moreover, Sema3F promotes loss of spines and excitatory synapses in dissociated neurons in vitro, and in Npn-2(-/-) brain slices cortical layer V and DG GCs exhibit increased mEPSC (miniature excitatory postsynaptic current) frequency. In contrast, a distinct Sema3A-Npn-1/PlexA4 signalling cascade controls basal dendritic arborization in layer V cortical neurons, but does not influence spine morphogenesis or distribution. These disparate effects of secreted semaphorins are reflected in the restricted dendritic localization of Npn-2 to apical dendrites and of Npn-1 (also known as Nrp1) to all dendrites of cortical pyramidal neurons. Therefore, Sema3F signalling controls spine distribution along select dendritic processes, and distinct secreted semaphorin signalling events orchestrate CNS connectivity through the differential control of spine morphogenesis, synapse formation, and the elaboration of dendritic morphology.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2842559/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2842559/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tran, Tracy S -- Rubio, Maria E -- Clem, Roger L -- Johnson, Dontais -- Case, Lauren -- Tessier-Lavigne, Marc -- Huganir, Richard L -- Ginty, David D -- Kolodkin, Alex L -- F32 NS051003/NS/NINDS NIH HHS/ -- P50 MH06883/MH/NIMH NIH HHS/ -- R01 DC-006881/DC/NIDCD NIH HHS/ -- R01 MH059199/MH/NIMH NIH HHS/ -- R01 MH059199-07/MH/NIMH NIH HHS/ -- R01 MH059199-08/MH/NIMH NIH HHS/ -- R01 MH059199-09/MH/NIMH NIH HHS/ -- R01 MH059199-10/MH/NIMH NIH HHS/ -- R01 MH59199/MH/NIMH NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2009 Dec 24;462(7276):1065-9. doi: 10.1038/nature08628. Epub 2009 Dec 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Solomon H. Snyder Department of Neuroscience, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20010807" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Central Nervous System/cytology/drug effects/*growth & ; development/*metabolism/ultrastructure ; Female ; Gene Expression Regulation, Developmental ; Male ; Mice ; Mice, Knockout ; Neuropilin-1/metabolism ; Neuropilin-2/metabolism ; Pyramidal Cells/*cytology/drug effects/*growth & development/ultrastructure ; Recombinant Proteins/pharmacology ; Semaphorins/genetics/*metabolism/pharmacology ; Signal Transduction ; Synapses/drug effects/*physiology/ultrastructure
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  • 61
    Publication Date: 2009-02-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ehrenfeld, Joan G -- England -- Nature. 2009 Feb 26;457(7233):1079. doi: 10.1038/4571079d.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19242450" target="_blank"〉PubMed〈/a〉
    Keywords: Aphrodisiacs/*history ; *Drama ; England ; Female ; History, 16th Century ; Humans ; *Literature, Modern ; *Love ; Male ; Wit and Humor as Topic
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  • 62
    Publication Date: 2009-02-13
    Description: The first recurrent translocation event in prostate cancer has been recently described; it results in the translocation of an ETS (E26 transformation specific) transcription factor (ERG or ETV1) to the TMPRSS2 promoter region, which contains androgen responsive elements. The TMPRSS2:ERG genetic rearrangement has been reported to occur in approximately 40% of primary prostate tumours (ETV1 genetic rearrangements occur at a much lower frequency), and it results in the aberrant androgen-regulated expression of ERG. Tomlins et al. concluded that ETS genetic rearrangements are sufficient to initiate prostate neoplasia. However, here we show that ETS genetic rearrangements may in fact represent progression events rather than initiation events in prostate tumorigenesis. To this end, we demonstrate that the prostate-specific overexpression of ERG does not initiate prostate tumorigenesis.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2967456/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2967456/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carver, Brett S -- Tran, Jennifer -- Chen, Zhenbang -- Carracedo-Perez, Arkaitz -- Alimonti, Andrea -- Nardella, Caterina -- Gopalan, Anuradha -- Scardino, Peter T -- Cordon-Cardo, Carlos -- Gerald, William -- Pandolfi, Pier Paolo -- P50 CA092629/CA/NCI NIH HHS/ -- P50 CA092629-10/CA/NCI NIH HHS/ -- R01 CA082328/CA/NCI NIH HHS/ -- R01 CA082328-12/CA/NCI NIH HHS/ -- R01 MD004038/MD/NIMHD NIH HHS/ -- U01 CA084292/CA/NCI NIH HHS/ -- U01 CA084292-10/CA/NCI NIH HHS/ -- England -- Nature. 2009 Feb 12;457(7231):E1; discussion E2-3. doi: 10.1038/nature07738.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cancer Biology and Genetics Program, Sloan-Kettering Institute, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19212347" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Transformation, Neoplastic/*genetics/metabolism/pathology ; DNA-Binding Proteins/genetics ; Disease Progression ; Gene Expression ; Male ; Mice ; Mice, Transgenic ; Oncogene Proteins/genetics/metabolism ; Prostatic Neoplasms/*genetics/metabolism ; Transcription Factors/genetics ; *Translocation, Genetic
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  • 63
    Publication Date: 2009-11-10
    Description: Direct reprogramming of somatic cells into induced pluripotent stem (iPS) cells can be achieved by overexpression of Oct4, Sox2, Klf4 and c-Myc transcription factors, but only a minority of donor somatic cells can be reprogrammed to pluripotency. Here we demonstrate that reprogramming by these transcription factors is a continuous stochastic process where almost all mouse donor cells eventually give rise to iPS cells on continued growth and transcription factor expression. Additional inhibition of the p53/p21 pathway or overexpression of Lin28 increased the cell division rate and resulted in an accelerated kinetics of iPS cell formation that was directly proportional to the increase in cell proliferation. In contrast, Nanog overexpression accelerated reprogramming in a predominantly cell-division-rate-independent manner. Quantitative analyses define distinct cell-division-rate-dependent and -independent modes for accelerating the stochastic course of reprogramming, and suggest that the number of cell divisions is a key parameter driving epigenetic reprogramming to pluripotency.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2789972/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2789972/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hanna, Jacob -- Saha, Krishanu -- Pando, Bernardo -- van Zon, Jeroen -- Lengner, Christopher J -- Creyghton, Menno P -- van Oudenaarden, Alexander -- Jaenisch, Rudolf -- R01 CA087869/CA/NCI NIH HHS/ -- R01 CA087869-09/CA/NCI NIH HHS/ -- R01 HD045022/HD/NICHD NIH HHS/ -- R01 HD045022-06/HD/NICHD NIH HHS/ -- R01-CA087869/CA/NCI NIH HHS/ -- R01-HDO45022/PHS HHS/ -- R37 CA084198/CA/NCI NIH HHS/ -- R37 CA084198-09/CA/NCI NIH HHS/ -- R37-CA084198/CA/NCI NIH HHS/ -- U54CA143874/CA/NCI NIH HHS/ -- England -- Nature. 2009 Dec 3;462(7273):595-601. doi: 10.1038/nature08592. Epub 2009 Nov 8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142, USA. Hanna@wi.mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19898493" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell Differentiation ; Cell Division ; Cell Line ; *Cellular Reprogramming ; Gene Expression Regulation, Developmental ; Mice ; Mice, SCID ; Models, Biological ; Pluripotent Stem Cells/*cytology/*metabolism ; Time Factors ; Transcription Factors/genetics/metabolism
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  • 64
    Publication Date: 2009-04-03
    Description: Explaining the ecological causes of evolutionary diversification is a major focus of biology, but surprisingly little has been said about the effects of evolutionary diversification on ecosystems. The number of species in an ecosystem and their traits are key predictors of many ecosystem-level processes, such as rates of productivity, biomass sequestration and decomposition. Here we demonstrate short-term ecosystem-level effects of adaptive radiation in the threespine stickleback (Gasterosteus aculeatus) over the past 10,000 years. These fish have undergone recent parallel diversification in several lakes in coastal British Columbia, resulting in the formation of two specialized species (benthic and limnetic) from a generalist ancestor. Using a mesocosm experiment, we demonstrate that this diversification has strong effects on ecosystems, affecting prey community structure, total primary production, and the nature of dissolved organic materials that regulate the spectral properties of light transmission in the system. However, these ecosystem effects do not simply increase in their relative strength with increasing specialization and species richness; instead, they reflect the complex and indirect consequences of ecosystem engineering by sticklebacks. It is well known that ecological factors influence adaptive radiation. We demonstrate that adaptive radiation, even over short timescales, can have profound effects on ecosystems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Harmon, Luke J -- Matthews, Blake -- Des Roches, Simone -- Chase, Jonathan M -- Shurin, Jonathan B -- Schluter, Dolph -- England -- Nature. 2009 Apr 30;458(7242):1167-70. doi: 10.1038/nature07974. Epub 2009 Apr 1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, University of Idaho, Moscow, Idaho 83844-3051, USA. lukeh@uidaho.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19339968" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biodiversity ; *Biological Evolution ; Biomass ; British Columbia ; *Ecosystem ; Fishes/*classification/*physiology ; Food Chain ; Fresh Water ; Genetic Speciation ; Models, Biological ; Population Density ; Predatory Behavior
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  • 65
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    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2009-08-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tuljapurkar, Shripad -- England -- Nature. 2009 Aug 6;460(7256):693-4. doi: 10.1038/460693a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19661903" target="_blank"〉PubMed〈/a〉
    Keywords: Age Distribution ; *Birth Rate/trends ; Developed Countries/economics/*statistics & numerical data ; Education ; Female ; Fertility/physiology ; Humans ; Income ; Life Expectancy ; Male ; Maternal Age ; *Population Growth ; Reproductive Behavior/*statistics & numerical data
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  • 66
    Publication Date: 2009-07-10
    Description: Inhibition of the TOR signalling pathway by genetic or pharmacological intervention extends lifespan in invertebrates, including yeast, nematodes and fruitflies; however, whether inhibition of mTOR signalling can extend lifespan in a mammalian species was unknown. Here we report that rapamycin, an inhibitor of the mTOR pathway, extends median and maximal lifespan of both male and female mice when fed beginning at 600 days of age. On the basis of age at 90% mortality, rapamycin led to an increase of 14% for females and 9% for males. The effect was seen at three independent test sites in genetically heterogeneous mice, chosen to avoid genotype-specific effects on disease susceptibility. Disease patterns of rapamycin-treated mice did not differ from those of control mice. In a separate study, rapamycin fed to mice beginning at 270 days of age also increased survival in both males and females, based on an interim analysis conducted near the median survival point. Rapamycin may extend lifespan by postponing death from cancer, by retarding mechanisms of ageing, or both. To our knowledge, these are the first results to demonstrate a role for mTOR signalling in the regulation of mammalian lifespan, as well as pharmacological extension of lifespan in both genders. These findings have implications for further development of interventions targeting mTOR for the treatment and prevention of age-related diseases.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2786175/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2786175/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Harrison, David E -- Strong, Randy -- Sharp, Zelton Dave -- Nelson, James F -- Astle, Clinton M -- Flurkey, Kevin -- Nadon, Nancy L -- Wilkinson, J Erby -- Frenkel, Krystyna -- Carter, Christy S -- Pahor, Marco -- Javors, Martin A -- Fernandez, Elizabeth -- Miller, Richard A -- AG022303/AG/NIA NIH HHS/ -- AG022307/AG/NIA NIH HHS/ -- AG022308/AG/NIA NIH HHS/ -- AG025707/AG/NIA NIH HHS/ -- AG13319/AG/NIA NIH HHS/ -- P30 AG013319/AG/NIA NIH HHS/ -- P30 AG013319-119002/AG/NIA NIH HHS/ -- P30 AG013319-129002/AG/NIA NIH HHS/ -- P30 AG013319-139002/AG/NIA NIH HHS/ -- P30 AG013319-149002/AG/NIA NIH HHS/ -- P30 AG025707/AG/NIA NIH HHS/ -- U01 AG022303/AG/NIA NIH HHS/ -- U01 AG022307/AG/NIA NIH HHS/ -- U01 AG022307-01/AG/NIA NIH HHS/ -- U01 AG022307-02/AG/NIA NIH HHS/ -- U01 AG022307-03/AG/NIA NIH HHS/ -- U01 AG022307-04/AG/NIA NIH HHS/ -- U01 AG022307-05/AG/NIA NIH HHS/ -- U01 AG022307-05S1/AG/NIA NIH HHS/ -- U01 AG022308/AG/NIA NIH HHS/ -- England -- Nature. 2009 Jul 16;460(7253):392-5. doi: 10.1038/nature08221. Epub 2009 Jul 8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Jackson Laboratory, Bar Harbor, Maine 04609, USA. david.harrison@jax.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19587680" target="_blank"〉PubMed〈/a〉
    Keywords: Administration, Oral ; Aging/*drug effects/genetics/*physiology ; Animals ; Carrier Proteins/antagonists & inhibitors/metabolism ; Diet ; Disease Susceptibility ; Female ; Longevity/*drug effects/*genetics/physiology ; Male ; Mice ; Phosphotransferases (Alcohol Group Acceptor)/antagonists & inhibitors/metabolism ; Sirolimus/*administration & dosage/*pharmacology ; Specific Pathogen-Free Organisms ; Survival Analysis ; TOR Serine-Threonine Kinases ; Time Factors
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  • 67
    Publication Date: 2009-09-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chakravarti, Aravinda -- England -- Nature. 2009 Sep 24;461(7263):487-8. doi: 10.1038/461487a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19779444" target="_blank"〉PubMed〈/a〉
    Keywords: Asia/ethnology ; Continental Population Groups/genetics/history ; Ethnic Groups/*genetics/history ; Europe/ethnology ; Female ; Founder Effect ; Genetics, Population ; Genome, Human/genetics ; Genomics ; Genotype ; History, 16th Century ; History, 20th Century ; History, Ancient ; Humans ; India ; Language ; Male ; *Phylogeny ; Polymorphism, Single Nucleotide/genetics
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 68
    Publication Date: 2009-10-09
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ng, Pauline C -- Murray, Sarah S -- Levy, Samuel -- Venter, J Craig -- England -- Nature. 2009 Oct 8;461(7265):724-6. doi: 10.1038/461724a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉J. Craig Venter Institute, Science Center Drive, San Diego, California 92121, USA. png@jcvi.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19812653" target="_blank"〉PubMed〈/a〉
    Keywords: Ethnic Groups/genetics ; False Negative Reactions ; Female ; Gene Frequency/genetics ; Genetic Counseling/methods/*standards ; Genetic Markers/genetics ; Genetic Predisposition to Disease/*genetics ; Genetic Testing/methods/*standards ; Genetics, Medical/methods/*standards ; Genome, Human/*genetics ; Genome-Wide Association Study ; Genotype ; Health Behavior ; Humans ; Male ; Odds Ratio ; Pharmacogenetics ; *Practice Guidelines as Topic ; Prospective Studies ; Reproducibility of Results ; Sequence Analysis, DNA/standards
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  • 69
    Publication Date: 2009-06-26
    Description: The integrity of polarized epithelia is critical for development and human health. Many questions remain concerning the full complement and the function of the proteins that regulate cell polarity. Here we report that the Drosophila FERM proteins Yurt (Yrt) and Coracle (Cora) and the membrane proteins Neurexin IV (Nrx-IV) and Na(+),K(+)-ATPase are a new group of functionally cooperating epithelial polarity proteins. This 'Yrt/Cora group' promotes basolateral membrane stability and shows negative regulatory interactions with the apical determinant Crumbs (Crb). Genetic analyses indicate that Nrx-IV and Na(+),K(+)-ATPase act together with Cora in one pathway, whereas Yrt acts in a second redundant pathway. Moreover, we show that the Yrt/Cora group is essential for epithelial polarity during organogenesis but not when epithelial polarity is first established or during terminal differentiation. This property of Yrt/Cora group proteins explains the recovery of polarity in embryos lacking the function of the Lethal giant larvae (Lgl) group of basolateral polarity proteins. We also find that the mammalian Yrt orthologue EPB41L5 (also known as YMO1 and Limulus) is required for lateral membrane formation, indicating a conserved function of Yrt proteins in epithelial polarity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Laprise, Patrick -- Lau, Kimberly M -- Harris, Kathryn P -- Silva-Gagliardi, Nancy F -- Paul, Sarah M -- Beronja, Slobodan -- Beitel, Greg J -- McGlade, C Jane -- Tepass, Ulrich -- England -- Nature. 2009 Jun 25;459(7250):1141-5. doi: 10.1038/nature08067.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario M5S 3G5, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19553998" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Adhesion Molecules, Neuronal/genetics/*metabolism ; Cell Line ; Cell Polarity ; Drosophila Proteins/genetics/*metabolism ; Drosophila melanogaster/*embryology/enzymology/genetics/metabolism ; Epithelium/embryology/*physiology ; Gene Knockdown Techniques ; Membrane Proteins/genetics/*metabolism ; Mutation ; Phenotype ; Sodium-Potassium-Exchanging ATPase/genetics/*metabolism
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  • 70
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    Nature Publishing Group (NPG)
    Publication Date: 2009-06-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Aguzzi, Adriano -- England -- Nature. 2009 Jun 18;459(7249):924-5. doi: 10.1038/459924a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19536253" target="_blank"〉PubMed〈/a〉
    Keywords: Amyloid/metabolism ; Animals ; Humans ; Models, Biological ; Peptides/metabolism ; Prion Diseases/*metabolism/pathology/transmission ; Prions/*chemistry/*metabolism ; Protein Denaturation ; tau Proteins/genetics/metabolism
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  • 71
    Publication Date: 2009-10-16
    Description: Hippocampal place cells encode spatial information in rate and temporal codes. To examine the mechanisms underlying hippocampal coding, here we measured the intracellular dynamics of place cells by combining in vivo whole-cell recordings with a virtual-reality system. Head-restrained mice, running on a spherical treadmill, interacted with a computer-generated visual environment to perform spatial behaviours. Robust place-cell activity was present during movement along a virtual linear track. From whole-cell recordings, we identified three subthreshold signatures of place fields: an asymmetric ramp-like depolarization of the baseline membrane potential, an increase in the amplitude of intracellular theta oscillations, and a phase precession of the intracellular theta oscillation relative to the extracellularly recorded theta rhythm. These intracellular dynamics underlie the primary features of place-cell rate and temporal codes. The virtual-reality system developed here will enable new experimental approaches to study the neural circuits underlying navigation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2771429/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2771429/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Harvey, Christopher D -- Collman, Forrest -- Dombeck, Daniel A -- Tank, David W -- 1R01MH083686-01/MH/NIMH NIH HHS/ -- 5R01MH060651-09/MH/NIMH NIH HHS/ -- R01 MH060651/MH/NIMH NIH HHS/ -- R01 MH060651-09/MH/NIMH NIH HHS/ -- R01 MH083686/MH/NIMH NIH HHS/ -- R01 MH083686-02/MH/NIMH NIH HHS/ -- R01 MH083686-02S1/MH/NIMH NIH HHS/ -- England -- Nature. 2009 Oct 15;461(7266):941-6. doi: 10.1038/nature08499.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Princeton Neuroscience Institute, New Jersey 08544, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19829374" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Behavior, Animal/physiology ; Hippocampus/*cytology/physiology ; Intracellular Space/*metabolism ; Locomotion/physiology ; Male ; Membrane Potentials/physiology ; Mice ; Mice, Inbred C57BL ; Neurons/*metabolism ; Pyramidal Cells/metabolism ; Space Perception/*physiology ; Theta Rhythm ; *User-Computer Interface
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  • 72
    Publication Date: 2009-11-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Agrawal, Aneil F -- England -- Nature. 2009 Nov 19;462(7271):294-5. doi: 10.1038/462294a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19924202" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Outbred Strains ; *Biological Evolution ; Caenorhabditis elegans/genetics/physiology ; Inbreeding ; Mutation ; Reproduction/*physiology
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  • 73
    Publication Date: 2009-07-15
    Description: Recent finds demonstrate that internal fertilization and viviparity (live birth) were more widespread in the Placodermi, an extinct group of armoured fishes, than was previously realized. Placoderms represent the sister group of the crown group jawed vertebrates (Gnathostomata), making their mode(s) of reproduction potentially informative about primitive gnathostome conditions. An ossified pelvic fin basipterygium discovered in the arthrodire Incisoscutum ritchiei was hypothesized to be identical in males and females, with males presumed to have an additional cartilaginous element or series forming a clasper. Here we report the discovery of a completely ossified pelvic clasper in Incisoscutum ritchiei (WAM 03.3.28) which shows that this interpretation was incorrect: the basipterygium described previously is in fact unique to females. The male clasper is a slender rod attached to a square basal plate that articulates directly with the pelvis. It carries a small cap of dermal bone covered in denticles and small hooks that may be homologous with the much larger dermal component of the ptyctodont clasper.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ahlberg, Per -- Trinajstic, Kate -- Johanson, Zerina -- Long, John -- England -- Nature. 2009 Aug 13;460(7257):888-9. doi: 10.1038/nature08176. Epub 2009 Jul 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Subdepartment of Evolutionary Organismal Biology, Department of Physiology and Developmental Biology, Uppsala University, Norbyvagen 18A, 752 36 Uppsala, Sweden.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19597477" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Structures/anatomy & histology/*physiology ; Animals ; Female ; Fertilization/*physiology ; Fishes/*anatomy & histology/*physiology ; Fossils ; History, Ancient ; Male ; Pelvis/anatomy & histology ; Viviparity, Nonmammalian/physiology
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  • 74
    Publication Date: 2009-10-02
    Description: Down Syndrome cell adhesion molecule (Dscam) genes encode neuronal cell recognition proteins of the immunoglobulin superfamily. In Drosophila, Dscam1 generates 19,008 different ectodomains by alternative splicing of three exon clusters, each encoding half or a complete variable immunoglobulin domain. Identical isoforms bind to each other, but rarely to isoforms differing at any one of the variable immunoglobulin domains. Binding between isoforms on opposing membranes promotes repulsion. Isoform diversity provides the molecular basis for neurite self-avoidance. Self-avoidance refers to the tendency of branches from the same neuron (self-branches) to selectively avoid one another. To ensure that repulsion is restricted to self-branches, different neurons express different sets of isoforms in a biased stochastic fashion. Genetic studies demonstrated that Dscam1 diversity has a profound role in wiring the fly brain. Here we show how many isoforms are required to provide an identification system that prevents non-self branches from inappropriately recognizing each other. Using homologous recombination, we generated mutant animals encoding 12, 24, 576 and 1,152 potential isoforms. Mutant animals with deletions encoding 4,752 and 14,256 isoforms were also analysed. Branching phenotypes were assessed in three classes of neurons. Branching patterns improved as the potential number of isoforms increased, and this was independent of the identity of the isoforms. Although branching defects in animals with 1,152 potential isoforms remained substantial, animals with 4,752 isoforms were indistinguishable from wild-type controls. Mathematical modelling studies were consistent with the experimental results that thousands of isoforms are necessary to ensure acquisition of unique Dscam1 identities in many neurons. We conclude that thousands of isoforms are essential to provide neurons with a robust discrimination mechanism to distinguish between self and non-self during self-avoidance.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2836808/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2836808/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hattori, Daisuke -- Chen, Yi -- Matthews, Benjamin J -- Salwinski, Lukasz -- Sabatti, Chiara -- Grueber, Wesley B -- Zipursky, S Lawrence -- F31 NS060341/NS/NINDS NIH HHS/ -- R01 DC006485/DC/NIDCD NIH HHS/ -- R01 DC006485-07/DC/NIDCD NIH HHS/ -- R01 HD040279/HD/NICHD NIH HHS/ -- R01 HD040279-05/HD/NICHD NIH HHS/ -- T32 HD007430/HD/NICHD NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2009 Oct 1;461(7264):644-8. doi: 10.1038/nature08431.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Chemistry, Howard Hughes Medical Institute, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California 90095, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19794492" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Alternative Splicing ; Animals ; Brain/cytology/metabolism ; Cell Adhesion Molecules/*chemistry/genetics/*metabolism ; Drosophila Proteins/*chemistry/genetics/*metabolism ; Drosophila melanogaster/*cytology/genetics/*metabolism ; Female ; Male ; Models, Biological ; Mushroom Bodies/cytology/metabolism ; Neurites/*metabolism ; Protein Isoforms/chemistry/genetics/metabolism ; Sequence Deletion ; Stochastic Processes
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  • 75
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    Nature Publishing Group (NPG)
    Publication Date: 2009-09-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nicholls, Henry -- England -- Nature. 2009 Sep 10;461(7261):164-6. doi: 10.1038/461164a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19741680" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Developmental Biology ; Fossils ; Hagfishes/*anatomy & histology/*classification/embryology/genetics ; Head/anatomy & histology ; Humans ; Lampreys/*anatomy & histology/*classification/embryology/genetics ; MicroRNAs/genetics/metabolism ; Models, Biological ; Phylogeny ; Sharks/anatomy & histology/classification/embryology
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  • 76
    Publication Date: 2009-02-20
    Description: The assembly of complex structures out of simple colloidal building blocks is of practical interest for building materials with unique optical properties (for example photonic crystals and DNA biosensors) and is of fundamental importance in improving our understanding of self-assembly processes occurring on molecular to macroscopic length scales. Here we demonstrate a self-assembly principle that is capable of organizing a diverse set of colloidal particles into highly reproducible, rotationally symmetric arrangements. The structures are assembled using the magnetostatic interaction between effectively diamagnetic and paramagnetic particles within a magnetized ferrofluid. The resulting multipolar geometries resemble electrostatic charge configurations such as axial quadrupoles ('Saturn rings'), axial octupoles ('flowers'), linear quadrupoles (poles) and mixed multipole arrangements ('two tone'), which represent just a few examples of the type of structure that can be built using this technique.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Erb, Randall M -- Son, Hui S -- Samanta, Bappaditya -- Rotello, Vincent M -- Yellen, Benjamin B -- England -- Nature. 2009 Feb 19;457(7232):999-1002. doi: 10.1038/nature07766.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Duke University, Department of Mechanical Engineering and Materials Science, Center for Biologically Inspired Materials and Material Systems, Box 90300, Hudson Hall, Durham, North Carolina 27708, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19225522" target="_blank"〉PubMed〈/a〉
    Keywords: Colloids/*chemistry ; *Magnetics ; Microscopy, Electron, Scanning ; Microspheres ; Models, Biological ; Nanostructures/chemistry/ultrastructure ; Particle Size ; Water/chemistry
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  • 77
    Publication Date: 2009-02-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Allen, Nicola J -- Barres, Ben A -- England -- Nature. 2009 Feb 5;457(7230):675-7. doi: 10.1038/457675a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19194443" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Astrocytes/physiology ; Biological Evolution ; Brain/*cytology/embryology/pathology/*physiology ; Cell Communication ; Cell Lineage ; Homeostasis ; Humans ; Models, Biological ; Nerve Net/physiology ; Nervous System Diseases/pathology/physiopathology ; Neural Pathways/physiology ; Neuroglia/classification/cytology/pathology/*physiology ; Neurons/cytology/physiology ; Oligodendroglia/pathology/physiology ; Schwann Cells/pathology/physiology
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  • 78
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    Nature Publishing Group (NPG)
    Publication Date: 2009-02-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Check Hayden, Erika -- England -- Nature. 2009 Feb 12;457(7231):776-9. doi: 10.1038/457776a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19212378" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; *Culture ; Genes/genetics ; Genome, Human ; Humans ; Mutation ; *Selection, Genetic
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  • 79
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    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2009-04-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Farmer, Stephen R -- England -- Nature. 2009 Apr 16;458(7240):839-40. doi: 10.1038/458839a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19370020" target="_blank"〉PubMed〈/a〉
    Keywords: Adipose Tissue, Brown/anatomy & histology/cytology/*metabolism ; *Cold Temperature ; Female ; Humans ; Male ; Obesity/drug therapy/*metabolism ; Sex Characteristics ; Weight Loss/*physiology
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  • 80
    Publication Date: 2009-05-29
    Description: The AMP-activated protein kinase (AMPK) is characterized by its ability to bind to AMP, which enables it to adjust enzymatic activity by sensing the cellular energy status and maintain the balance between ATP production and consumption in eukaryotic cells. It also has important roles in the regulation of cell growth and proliferation, and in the establishment and maintenance of cell polarity. These important functions have rendered AMPK an important drug target for obesity, type 2 diabetes and cancer treatments. However, the regulatory mechanism of AMPK activity by AMP binding remains unsolved. Here we report the crystal structures of an unphosphorylated fragment of the AMPK alpha-subunit (KD-AID) from Schizosaccharomyces pombe that contains both the catalytic kinase domain and an autoinhibitory domain (AID), and of a phosphorylated kinase domain from Saccharomyces cerevisiae (Snf1-pKD). The AID binds, from the 'backside', to the hinge region of its kinase domain, forming contacts with both amino-terminal and carboxy-terminal lobes. Structural analyses indicate that AID binding might constrain the mobility of helix alphaC, hence resulting in an autoinhibited KD-AID with much lower kinase activity than that of the kinase domain alone. AMP activates AMPK both allosterically and by inhibiting dephosphorylation. Further in vitro kinetic studies demonstrate that disruption of the KD-AID interface reverses the autoinhibition and these AMPK heterotrimeric mutants no longer respond to the change in AMP concentration. The structural and biochemical data have shown the primary mechanism of AMPK autoinhibition and suggest a conformational switch model for AMPK activation by AMP.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Lei -- Jiao, Zhi-Hao -- Zheng, Li-Sha -- Zhang, Yuan-Yuan -- Xie, Shu-Tao -- Wang, Zhi-Xin -- Wu, Jia-Wei -- England -- Nature. 2009 Jun 25;459(7250):1146-9. doi: 10.1038/nature08075. Epub 2009 May 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉MOE Key Laboratory of Bioinformatics, Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19474788" target="_blank"〉PubMed〈/a〉
    Keywords: AMP-Activated Protein Kinases/*chemistry/*metabolism ; Adenosine Monophosphate/metabolism ; Amino Acid Sequence ; Animals ; *Models, Molecular ; Molecular Sequence Data ; Mutation ; Phosphorylation ; Protein Structure, Tertiary ; Rats ; Saccharomyces cerevisiae/*enzymology ; Schizosaccharomyces/*enzymology ; Sequence Alignment
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  • 81
    Publication Date: 2009-08-21
    Description: The isolation of human induced pluripotent stem cells (iPSCs) offers a new strategy for modelling human disease. Recent studies have reported the derivation and differentiation of disease-specific human iPSCs. However, a key challenge in the field is the demonstration of disease-related phenotypes and the ability to model pathogenesis and treatment of disease in iPSCs. Familial dysautonomia (FD) is a rare but fatal peripheral neuropathy, caused by a point mutation in the IKBKAP gene involved in transcriptional elongation. The disease is characterized by the depletion of autonomic and sensory neurons. The specificity to the peripheral nervous system and the mechanism of neuron loss in FD are poorly understood owing to the lack of an appropriate model system. Here we report the derivation of patient-specific FD-iPSCs and the directed differentiation into cells of all three germ layers including peripheral neurons. Gene expression analysis in purified FD-iPSC-derived lineages demonstrates tissue-specific mis-splicing of IKBKAP in vitro. Patient-specific neural crest precursors express particularly low levels of normal IKBKAP transcript, suggesting a mechanism for disease specificity. FD pathogenesis is further characterized by transcriptome analysis and cell-based assays revealing marked defects in neurogenic differentiation and migration behaviour. Furthermore, we use FD-iPSCs for validating the potency of candidate drugs in reversing aberrant splicing and ameliorating neuronal differentiation and migration. Our study illustrates the promise of iPSC technology for gaining new insights into human disease pathogenesis and treatment.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2784695/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2784695/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, Gabsang -- Papapetrou, Eirini P -- Kim, Hyesoo -- Chambers, Stuart M -- Tomishima, Mark J -- Fasano, Christopher A -- Ganat, Yosif M -- Menon, Jayanthi -- Shimizu, Fumiko -- Viale, Agnes -- Tabar, Viviane -- Sadelain, Michel -- Studer, Lorenz -- R01 NS052671/NS/NINDS NIH HHS/ -- R01 NS052671-03/NS/NINDS NIH HHS/ -- England -- Nature. 2009 Sep 17;461(7262):402-6. doi: 10.1038/nature08320. Epub 2009 Aug 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Developmental Biology Program, Sloan-Kettering Institute, 1275 York Ave, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19693009" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Alternative Splicing/drug effects/genetics ; Animals ; Carrier Proteins/genetics ; Cell Dedifferentiation ; Cell Differentiation ; Cell Lineage ; Cell Movement ; Cells, Cultured ; Child ; Dysautonomia, Familial/drug therapy/genetics/*pathology/*therapy ; Female ; Fibroblasts/cytology/metabolism ; Gene Expression Profiling ; Humans ; Kinetin/pharmacology/therapeutic use ; Male ; Mice ; *Models, Biological ; Neural Crest/cytology/drug effects ; Organ Specificity ; Phenotype ; Pluripotent Stem Cells/cytology/drug effects/*metabolism/*transplantation
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  • 82
    Publication Date: 2009-01-09
    Description: Haematopoietic stem cells (HSCs) are the founder cells of the adult haematopoietic system, and thus knowledge of the molecular program directing their generation during development is important for regenerative haematopoietic strategies. Runx1 is a pivotal transcription factor required for HSC generation in the vascular regions of the mouse conceptus-the aorta, vitelline and umbilical arteries, yolk sac and placenta. It is thought that HSCs emerge from vascular endothelial cells through the formation of intra-arterial clusters and that Runx1 functions during the transition from 'haemogenic endothelium' to HSCs. Here we show by conditional deletion that Runx1 activity in vascular-endothelial-cadherin-positive endothelial cells is indeed essential for intra-arterial cluster, haematopoietic progenitor and HSC formation in mice. In contrast, Runx1 is not required in cells expressing Vav1, one of the first pan-haematopoietic genes expressed in HSCs. Collectively these data show that Runx1 function is essential in endothelial cells for haematopoietic progenitor and HSC formation from the vasculature, but its requirement ends once or before Vav is expressed.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2744041/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2744041/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Michael J -- Yokomizo, Tomomasa -- Zeigler, Brandon M -- Dzierzak, Elaine -- Speck, Nancy A -- CA23108/CA/NCI NIH HHS/ -- R01 CA058343/CA/NCI NIH HHS/ -- R01DK54077/DK/NIDDK NIH HHS/ -- R01HL091724/HL/NHLBI NIH HHS/ -- R37 DK054077/DK/NIDDK NIH HHS/ -- R37 DK054077-09/DK/NIDDK NIH HHS/ -- T32 AI-07519/AI/NIAID NIH HHS/ -- England -- Nature. 2009 Feb 12;457(7231):887-91. doi: 10.1038/nature07619. Epub 2009 Jan 7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Dartmouth Medical School, Hanover, New Hampshire 03755, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19129762" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD/metabolism ; Cadherins/metabolism ; *Cell Differentiation ; Core Binding Factor Alpha 2 Subunit/genetics/*metabolism ; Endothelial Cells/*cytology ; Female ; *Gene Expression Regulation, Developmental ; Hematopoietic Stem Cells/*cytology ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Transgenic ; Proto-Oncogene Proteins c-vav/metabolism
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  • 83
    Publication Date: 2009-05-02
    Description: Gene silencing by double-stranded RNA, denoted RNA interference, represents a new paradigm for rational drug design. However, the transformative therapeutic potential of short interfering RNA (siRNA) has been stymied by a key obstacle-safe delivery to specified target cells in vivo. Macrophages are particularly attractive targets for RNA interference therapy because they promote pathogenic inflammatory responses in diseases such as rheumatoid arthritis, atherosclerosis, inflammatory bowel disease and diabetes. Here we report the engineering of beta1,3-D-glucan-encapsulated siRNA particles (GeRPs) as efficient oral delivery vehicles that potently silence genes in mouse macrophages in vitro and in vivo. Oral gavage of mice with GeRPs containing as little as 20 microg kg(-1) siRNA directed against tumour necrosis factor alpha (Tnf-alpha) depleted its messenger RNA in macrophages recovered from the peritoneum, spleen, liver and lung, and lowered serum Tnf-alpha levels. Screening with GeRPs for inflammation genes revealed that the mitogen-activated protein kinase kinase kinase kinase 4 (Map4k4) is a previously unknown mediator of cytokine expression. Importantly, silencing Map4k4 in macrophages in vivo protected mice from lipopolysaccharide-induced lethality by inhibiting Tnf-alpha and interleukin-1beta production. This technology defines a new strategy for oral delivery of siRNA to attenuate inflammatory responses in human disease.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2879154/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2879154/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Aouadi, Myriam -- Tesz, Gregory J -- Nicoloro, Sarah M -- Wang, Mengxi -- Chouinard, My -- Soto, Ernesto -- Ostroff, Gary R -- Czech, Michael P -- DK 30898/DK/NIDDK NIH HHS/ -- DK 32520/DK/NIDDK NIH HHS/ -- DK 60837/DK/NIDDK NIH HHS/ -- P30 DK032520/DK/NIDDK NIH HHS/ -- P30 DK032520-25/DK/NIDDK NIH HHS/ -- R01 DK030898/DK/NIDDK NIH HHS/ -- R01 DK030898-26/DK/NIDDK NIH HHS/ -- R01 DK060837/DK/NIDDK NIH HHS/ -- R01 DK060837-01A1/DK/NIDDK NIH HHS/ -- R37 DK030898/DK/NIDDK NIH HHS/ -- England -- Nature. 2009 Apr 30;458(7242):1180-4. doi: 10.1038/nature07774.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, Massachusetts 01605, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19407801" target="_blank"〉PubMed〈/a〉
    Keywords: Administration, Oral ; Animals ; *Drug Delivery Systems ; Enzyme Activation/drug effects ; *Gene Silencing ; Glucans/metabolism ; Inflammation/genetics/*prevention & control ; Interleukin-1beta/biosynthesis ; JNK Mitogen-Activated Protein Kinases/metabolism ; Lipopolysaccharides/pharmacology ; MAP Kinase Signaling System/drug effects ; Macrophages/drug effects/*metabolism ; Male ; Mice ; Mice, Inbred C57BL ; NF-kappa B/metabolism ; Organ Specificity ; Protein-Serine-Threonine Kinases/*deficiency/*genetics/metabolism ; RNA, Small Interfering/*administration & dosage/genetics/metabolism ; Substrate Specificity ; Tumor Necrosis Factor-alpha/biosynthesis/metabolism ; p38 Mitogen-Activated Protein Kinases/metabolism
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  • 84
    Publication Date: 2009-05-05
    Description: Culture is typically viewed as consisting of traits inherited epigenetically, through social learning. However, cultural diversity has species-typical constraints, presumably of genetic origin. A celebrated, if contentious, example is whether a universal grammar constrains syntactic diversity in human languages. Oscine songbirds exhibit song learning and provide biologically tractable models of culture: members of a species show individual variation in song and geographically separated groups have local song dialects. Different species exhibit distinct song cultures, suggestive of genetic constraints. Without such constraints, innovations and copying errors should cause unbounded variation over multiple generations or geographical distance, contrary to observations. Here we report an experiment designed to determine whether wild-type song culture might emerge over multiple generations in an isolated colony founded by isolates, and, if so, how this might happen and what type of social environment is required. Zebra finch isolates, unexposed to singing males during development, produce song with characteristics that differ from the wild-type song found in laboratory or natural colonies. In tutoring lineages starting from isolate founders, we quantified alterations in song across tutoring generations in two social environments: tutor-pupil pairs in sound-isolated chambers and an isolated semi-natural colony. In both settings, juveniles imitated the isolate tutors but changed certain characteristics of the songs. These alterations accumulated over learning generations. Consequently, songs evolved towards the wild-type in three to four generations. Thus, species-typical song culture can appear de novo. Our study has parallels with language change and evolution. In analogy to models in quantitative genetics, we model song culture as a multigenerational phenotype partly encoded genetically in an isolate founding population, influenced by environmental variables and taking multiple generations to emerge.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2693086/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2693086/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Feher, Olga -- Wang, Haibin -- Saar, Sigal -- Mitra, Partha P -- Tchernichovski, Ofer -- R01 DC004722/DC/NIDCD NIH HHS/ -- R01 DC004722-09/DC/NIDCD NIH HHS/ -- England -- Nature. 2009 May 28;459(7246):564-8. doi: 10.1038/nature07994. Epub 2009 May 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, City College, City University of New York, New York 10031, USA. olcifeher@gmail.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19412161" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Evolution ; *Culture ; Female ; Finches/*physiology ; Instinct ; Learning/physiology ; Male ; *Models, Biological ; Social Isolation ; Vocalization, Animal/*physiology
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  • 85
    facet.materialart.
    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2009-09-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Feil, Robert -- England -- Nature. 2009 Sep 17;461(7262):359-60. doi: 10.1038/461359a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19759613" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *DNA Methylation ; Embryo, Mammalian/cytology/embryology/metabolism ; Female ; *Genomic Imprinting ; Histones/*metabolism ; Humans ; Male ; Mice ; Oocytes/metabolism ; Oxidoreductases, N-Demethylating/*metabolism
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  • 86
    Publication Date: 2009-12-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nosengo, Nicola -- England -- Nature. 2009 Dec 3;462(7273):560-1. doi: 10.1038/462560a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19956234" target="_blank"〉PubMed〈/a〉
    Keywords: *Acoustics ; Animal Communication ; Animals ; Female ; Male ; Mediterranean Sea ; Seasons ; *Seawater ; Whales/*physiology
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  • 87
    Publication Date: 2009-09-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vasquez, Valeria -- Perozo, Eduardo -- England -- Nature. 2009 Sep 3;461(7260):47-9. doi: 10.1038/461047a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19727188" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Proteins/*chemistry/*metabolism ; Crystallography, X-Ray ; Ion Channel Gating/*physiology ; Ion Channels/*chemistry/*metabolism ; Models, Biological ; Models, Molecular ; Mycobacterium tuberculosis/chemistry ; Pressure ; Protein Structure, Quaternary ; Staphylococcus aureus/*chemistry
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  • 88
    Publication Date: 2009-07-25
    Description: Spatially synchronized fluctuations in system state are common in physical and biological systems ranging from individual atoms to species as diverse as viruses, insects and mammals. Although the causal factors are well known for many synchronized phenomena, several processes concurrently have an impact on spatial synchrony of species, making their separate effects and interactions difficult to quantify. Here we develop a general stochastic model of predator-prey spatial dynamics to predict the outcome of a laboratory microcosm experiment testing for interactions among all known synchronizing factors: (1) dispersal of individuals between populations; (2) spatially synchronous fluctuations in exogenous environmental factors (the Moran effect); and (3) interactions with other species (for example, predators) that are themselves spatially synchronized. The Moran effect synchronized populations of the ciliate protist Tetrahymena pyriformis; however, dispersal only synchronized prey populations in the presence of the predator Euplotes patella. Both model and data indicate that synchrony depends on cyclic dynamics generated by the predator. Dispersal, but not the Moran effect, 'phase-locks' cycles, which otherwise become 'decoherent' and drift out of phase. In the absence of cycles, phase-locking is not possible and the synchronizing effect of dispersal is negligible. Interspecific interactions determine population synchrony, not by providing an additional source of synchronized fluctuations, but by altering population dynamics and thereby enhancing the action of dispersal. Our results are robust to wide variation in model parameters representative of many natural predator-prey or host-pathogen systems. This explains why cyclic systems provide many of the most dramatic examples of spatial synchrony in nature.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vasseur, David A -- Fox, Jeremy W -- England -- Nature. 2009 Aug 20;460(7258):1007-10. doi: 10.1038/nature08208. Epub 2009 Jul 22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Evolutionary Biology, Yale University, New Haven, Connecticut 06520, USA. david.vasseur@yale.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19626006" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Euplotes/*physiology ; *Food Chain ; Models, Biological ; Population Dynamics ; Predatory Behavior/*physiology ; Stochastic Processes ; Tetrahymena pyriformis/*physiology
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  • 89
    Publication Date: 2009-10-23
    Description: Millions of people regularly obtain insufficient sleep. Given the effect of sleep deprivation on our lives, understanding the cellular and molecular pathways affected by sleep deprivation is clearly of social and clinical importance. One of the major effects of sleep deprivation on the brain is to produce memory deficits in learning models that are dependent on the hippocampus. Here we have identified a molecular mechanism by which brief sleep deprivation alters hippocampal function. Sleep deprivation selectively impaired 3', 5'-cyclic AMP (cAMP)- and protein kinase A (PKA)-dependent forms of synaptic plasticity in the mouse hippocampus, reduced cAMP signalling, and increased activity and protein levels of phosphodiesterase 4 (PDE4), an enzyme that degrades cAMP. Treatment of mice with phosphodiesterase inhibitors rescued the sleep-deprivation-induced deficits in cAMP signalling, synaptic plasticity and hippocampus-dependent memory. These findings demonstrate that brief sleep deprivation disrupts hippocampal function by interfering with cAMP signalling through increased PDE4 activity. Thus, drugs that enhance cAMP signalling may provide a new therapeutic approach to counteract the cognitive effects of sleep deprivation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2783639/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2783639/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vecsey, Christopher G -- Baillie, George S -- Jaganath, Devan -- Havekes, Robbert -- Daniels, Andrew -- Wimmer, Mathieu -- Huang, Ted -- Brown, Kim M -- Li, Xiang-Yao -- Descalzi, Giannina -- Kim, Susan S -- Chen, Tao -- Shang, Yu-Ze -- Zhuo, Min -- Houslay, Miles D -- Abel, Ted -- 84256/Canadian Institutes of Health Research/Canada -- AG017628/AG/NIA NIH HHS/ -- G0600765/Medical Research Council/United Kingdom -- GM07517/GM/NIGMS NIH HHS/ -- HL060287/HL/NHLBI NIH HHS/ -- HL07953/HL/NHLBI NIH HHS/ -- P01 AG017628/AG/NIA NIH HHS/ -- P01 AG017628-080006/AG/NIA NIH HHS/ -- P50 HL060287/HL/NHLBI NIH HHS/ -- P50 HL060287-100006/HL/NHLBI NIH HHS/ -- England -- Nature. 2009 Oct 22;461(7267):1122-5. doi: 10.1038/nature08488.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Neuroscience Graduate Group, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19847264" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Colforsin/pharmacology ; Cyclic AMP/*metabolism ; Cyclic AMP-Dependent Protein Kinases/metabolism ; Cyclic Nucleotide Phosphodiesterases, Type 4/metabolism ; Hippocampus/drug effects/enzymology/*metabolism/physiology ; Long-Term Potentiation/drug effects ; Male ; Memory/drug effects/physiology ; Mice ; Mice, Inbred C57BL ; Neuronal Plasticity ; Phosphodiesterase 4 Inhibitors ; Rolipram/pharmacology ; *Second Messenger Systems/drug effects ; Sleep Deprivation/*physiopathology ; Time Factors
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  • 90
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    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2009-10-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lehrer, Jonah -- England -- Nature. 2009 Oct 15;461(7266):862-4. doi: 10.1038/461862a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19829344" target="_blank"〉PubMed〈/a〉
    Keywords: Aging/genetics/physiology ; Animals ; Biomedical Enhancement/*methods ; Cognition/*physiology ; Cyclic AMP Response Element-Binding Protein/genetics/metabolism ; Humans ; Long-Term Potentiation/genetics/physiology ; Male ; Maze Learning ; Memory/*physiology ; Mice ; Mice, Mutant Strains ; Neuronal Plasticity/genetics/physiology ; Receptors, N-Methyl-D-Aspartate/genetics/metabolism
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  • 91
    Publication Date: 2009-07-07
    Description: Activator protein 1 (AP-1, also known as JUN) transcription factors are dimers of JUN, FOS, MAF and activating transcription factor (ATF) family proteins characterized by basic region and leucine zipper domains. Many AP-1 proteins contain defined transcriptional activation domains, but BATF and the closely related BATF3 (refs 2, 3) contain only a basic region and leucine zipper, and are considered to be inhibitors of AP-1 activity. Here we show that Batf is required for the differentiation of IL17-producing T helper (T(H)17) cells. T(H)17 cells comprise a CD4(+) T-cell subset that coordinates inflammatory responses in host defence but is pathogenic in autoimmunity. Batf(-/-) mice have normal T(H)1 and T(H)2 differentiation, but show a defect in T(H)17 differentiation, and are resistant to experimental autoimmune encephalomyelitis. Batf(-/-) T cells fail to induce known factors required for T(H)17 differentiation, such as RORgamma t (encoded by Rorc) and the cytokine IL21 (refs 14-17). Neither the addition of IL21 nor the overexpression of RORgamma t fully restores IL17 production in Batf(-/-) T cells. The Il17 promoter is BATF-responsive, and after T(H)17 differentiation, BATF binds conserved intergenic elements in the Il17a-Il17f locus and to the Il17, Il21 and Il22 (ref. 18) promoters. These results demonstrate that the AP-1 protein BATF has a critical role in T(H)17 differentiation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2716014/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2716014/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schraml, Barbara U -- Hildner, Kai -- Ise, Wataru -- Lee, Wan-Ling -- Smith, Whitney A-E -- Solomon, Ben -- Sahota, Gurmukh -- Sim, Julia -- Mukasa, Ryuta -- Cemerski, Saso -- Hatton, Robin D -- Stormo, Gary D -- Weaver, Casey T -- Russell, John H -- Murphy, Theresa L -- Murphy, Kenneth M -- AI035783/AI/NIAID NIH HHS/ -- AR049293/AR/NIAMS NIH HHS/ -- GM07200/GM/NIGMS NIH HHS/ -- HG00249/HG/NHGRI NIH HHS/ -- R01 HG000249/HG/NHGRI NIH HHS/ -- R01 HG000249-20/HG/NHGRI NIH HHS/ -- T32 GM008802/GM/NIGMS NIH HHS/ -- T32 GM008802-08/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2009 Jul 16;460(7253):405-9. doi: 10.1038/nature08114. Epub 2009 Jul 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology and Immunology, Washington University School of Medicine, 660 South Euclid Avenue, Saint Louis, Missouri 63110, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19578362" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Basic-Leucine Zipper Transcription Factors/deficiency/genetics/*metabolism ; *Cell Differentiation ; Encephalomyelitis, Autoimmune, Experimental/genetics ; Female ; Gene Expression Regulation ; Genetic Predisposition to Disease ; Interleukin-17/biosynthesis/genetics/*metabolism ; Interleukins/genetics/metabolism/pharmacology ; Lymph Nodes/metabolism ; Male ; Mice ; Nuclear Receptor Subfamily 1, Group F, Member 3 ; Promoter Regions, Genetic/genetics ; Receptors, Retinoic Acid/genetics/metabolism ; Receptors, Thyroid Hormone/genetics/metabolism ; T-Lymphocytes, Helper-Inducer/*cytology/*metabolism ; Transcription Factor AP-1/deficiency/genetics/*metabolism
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  • 92
    Publication Date: 2009-02-24
    Description: Several independent, genome-wide association studies have identified a strong correlation between body mass index and polymorphisms in the human FTO gene. Common variants in the first intron define a risk allele predisposing to obesity, with homozygotes for the risk allele weighing approximately 3 kilograms more than homozygotes for the low risk allele. Nevertheless, the functional role of FTO in energy homeostasis remains elusive. Here we show that the loss of Fto in mice leads to postnatal growth retardation and a significant reduction in adipose tissue and lean body mass. The leanness of Fto-deficient mice develops as a consequence of increased energy expenditure and systemic sympathetic activation, despite decreased spontaneous locomotor activity and relative hyperphagia. Taken together, these experiments provide, to our knowledge, the first direct demonstration that Fto is functionally involved in energy homeostasis by the control of energy expenditure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fischer, Julia -- Koch, Linda -- Emmerling, Christian -- Vierkotten, Jeanette -- Peters, Thomas -- Bruning, Jens C -- Ruther, Ulrich -- England -- Nature. 2009 Apr 16;458(7240):894-8. doi: 10.1038/nature07848. Epub 2009 Feb 22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Animal Developmental and Molecular Biology, Heinrich Heine University, Universitatsstr. 1, D-40225 Dusseldorf, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19234441" target="_blank"〉PubMed〈/a〉
    Keywords: Adipose Tissue/metabolism ; Adiposity/genetics ; Animals ; Animals, Newborn ; Body Weight/genetics ; Brain/metabolism ; Eating/physiology ; Embryo, Mammalian/anatomy & histology/embryology ; Energy Metabolism/genetics/physiology ; Female ; Growth Disorders/genetics/physiopathology ; Homozygote ; Hyperphagia/genetics ; Insulin/metabolism ; Male ; Mice ; Mixed Function Oxygenases ; Motor Activity/genetics/physiology ; Obesity/*genetics/prevention & control ; Oxo-Acid-Lyases/*deficiency/genetics/*metabolism ; Phenotype ; Sympathetic Nervous System/physiology ; Thinness/*genetics
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  • 93
    Publication Date: 2009-06-26
    Description: Myogenic potential, survival and expansion of mammalian muscle progenitors depend on the myogenic determinants Pax3 and Pax7 embryonically, and Pax7 alone perinatally. Several in vitro studies support the critical role of Pax7 in these functions of adult muscle stem cells (satellite cells), but a formal demonstration has been lacking in vivo. Here we show, through the application of inducible Cre/loxP lineage tracing and conditional gene inactivation to the tibialis anterior muscle regeneration paradigm, that, unexpectedly, when Pax7 is inactivated in adult mice, mutant satellite cells are not compromised in muscle regeneration, they can proliferate and reoccupy the sublaminal satellite niche, and they are able to support further regenerative processes. Dual adult inactivation of Pax3 and Pax7 also results in normal muscle regeneration. Multiple time points of gene inactivation reveal that Pax7 is only required up to the juvenile period when progenitor cells make the transition into quiescence. Furthermore, we demonstrate a cell-intrinsic difference between neonatal progenitor and adult satellite cells in their Pax7-dependency. Our finding of an age-dependent change in the genetic requirement for muscle stem cells cautions against inferring adult stem-cell biology from embryonic studies, and has direct implications for the use of stem cells from hosts of different ages in transplantation-based therapy.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2767162/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2767162/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lepper, Christoph -- Conway, Simon J -- Fan, Chen-Ming -- R01 HL060714/HL/NHLBI NIH HHS/ -- R01 HL060714-02/HL/NHLBI NIH HHS/ -- R01 HL060714-11/HL/NHLBI NIH HHS/ -- England -- Nature. 2009 Jul 30;460(7255):627-31. doi: 10.1038/nature08209.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Embryology, Carnegie Institution, 3520 San Martin Drive, Baltimore, Maryland 21218, USA. lepper@ciwemb.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19554048" target="_blank"〉PubMed〈/a〉
    Keywords: Aging ; Animals ; Cell Proliferation ; Cells, Cultured ; Gene Expression Regulation, Developmental ; Mice ; Muscle, Skeletal/cytology/growth & development ; Mutation ; PAX7 Transcription Factor/metabolism ; Paired Box Transcription Factors/metabolism ; Regeneration/genetics/*physiology ; Satellite Cells, Skeletal Muscle/*cytology/drug effects/*physiology ; Selective Estrogen Receptor Modulators/pharmacology ; Stem Cells/*cytology/drug effects/*physiology ; Tamoxifen/pharmacology ; Time Factors
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  • 94
    Publication Date: 2009-05-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fitch, W Tecumseh -- England -- Nature. 2009 May 28;459(7246):519-20. doi: 10.1038/459519a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19478774" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Child ; *Culture ; Female ; Finches/*physiology ; Humans ; Instinct ; *Language ; Learning/physiology ; Linguistics ; Male ; *Models, Biological ; Social Isolation ; Vocalization, Animal/*physiology
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  • 95
    Publication Date: 2009-06-12
    Description: Natural products containing phosphorus-carbon bonds have found widespread use in medicine and agriculture. One such compound, phosphinothricin tripeptide, contains the unusual amino acid phosphinothricin attached to two alanine residues. Synthetic phosphinothricin (glufosinate) is a component of two top-selling herbicides (Basta and Liberty), and is widely used with resistant transgenic crops including corn, cotton and canola. Recent genetic and biochemical studies showed that during phosphinothricin tripeptide biosynthesis 2-hydroxyethylphosphonate (HEP) is converted to hydroxymethylphosphonate (HMP). Here we report the in vitro reconstitution of this unprecedented C(sp(3))-C(sp(3)) bond cleavage reaction and X-ray crystal structures of the enzyme. The protein is a mononuclear non-haem iron(ii)-dependent dioxygenase that converts HEP to HMP and formate. In contrast to most other members of this family, the oxidative consumption of HEP does not require additional cofactors or the input of exogenous electrons. The current study expands the scope of reactions catalysed by the 2-His-1-carboxylate mononuclear non-haem iron family of enzymes.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2874955/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2874955/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cicchillo, Robert M -- Zhang, Houjin -- Blodgett, Joshua A V -- Whitteck, John T -- Li, Gongyong -- Nair, Satish K -- van der Donk, Wilfred A -- Metcalf, William W -- P01 GM077596/GM/NIGMS NIH HHS/ -- P01 GM077596-03/GM/NIGMS NIH HHS/ -- R01 GM059334/GM/NIGMS NIH HHS/ -- R01 GM059334-09/GM/NIGMS NIH HHS/ -- R01 GM59334/GM/NIGMS NIH HHS/ -- England -- Nature. 2009 Jun 11;459(7248):871-4. doi: 10.1038/nature07972.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19516340" target="_blank"〉PubMed〈/a〉
    Keywords: Aminobutyrates/*chemistry/*metabolism ; Biocatalysis ; Crystallography, X-Ray ; Dioxygenases/chemistry/genetics/*metabolism ; Escherichia coli ; Formates/metabolism ; Magnetic Resonance Spectroscopy ; Mass Spectrometry ; Models, Biological ; Models, Molecular ; Molecular Conformation ; Organophosphonates/metabolism
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  • 96
    Publication Date: 2009-08-14
    Description: Ecological communities characteristically contain a wide diversity of species with important functional, economic and aesthetic value. Ecologists have long questioned how this diversity is maintained. Classic theory shows that stable coexistence requires competitors to differ in their niches; this has motivated numerous investigations of ecological differences presumed to maintain diversity. That niche differences are key to coexistence, however, has recently been challenged by the neutral theory of biodiversity, which explains coexistence with the equivalence of competitors. The ensuing controversy has motivated calls for a better understanding of the collective importance of niche differences for the diversity observed in ecological communities. Here we integrate theory and experimentation to show that niche differences collectively stabilize the dynamics of experimental communities of serpentine annual plants. We used field-parameterized population models to develop a null expectation for community dynamics without the stabilizing effects of niche differences. The population growth rates predicted by this null model varied by several orders of magnitude between species, which is sufficient for rapid competitive exclusion. Moreover, after two generations of community change in the field, Shannon diversity was over 50 per cent greater in communities stabilized by niche differences relative to those exhibiting dynamics predicted by the null model. Finally, in an experiment manipulating species' relative abundances, population growth rates increased when species became rare--the demographic signature of niche differences. Our work thus provides strong evidence that species differences have a critical role in stabilizing species diversity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Levine, Jonathan M -- HilleRisLambers, Janneke -- England -- Nature. 2009 Sep 10;461(7261):254-7. doi: 10.1038/nature08251. Epub 2009 Aug 12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, California 93106, USA. levine@lifesci.ucsb.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19675568" target="_blank"〉PubMed〈/a〉
    Keywords: *Biodiversity ; California ; *Ecosystem ; Models, Biological ; Plant Development ; *Plant Physiological Phenomena ; Plants/classification ; Population Dynamics ; Seeds/physiology
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  • 97
    Publication Date: 2009-09-04
    Description: Differential DNA methylation of the paternal and maternal alleles regulates the parental origin-specific expression of imprinted genes in mammals. The methylation imprints are established in male and female germ cells during gametogenesis, and the de novo DNA methyltransferase DNMT3A and its cofactor DNMT3L are required in this process. However, the mechanisms underlying locus- and parental-specific targeting of the de novo DNA methylation machinery in germline imprinting are poorly understood. Here we show that amine oxidase (flavin-containing) domain 1 (AOF1), a protein related to the lysine demethylase KDM1 (also known as LSD1), functions as a histone H3 lysine 4 (H3K4) demethylase and is required for de novo DNA methylation of some imprinted genes in oocytes. AOF1, now renamed lysine demethylase 1B (KDM1B) following a new nomenclature, is highly expressed in growing oocytes where genomic imprints are established. Targeted disruption of the gene encoding KDM1B had no effect on mouse development and oogenesis. However, oocytes from KDM1B-deficient females showed a substantial increase in H3K4 methylation and failed to set up the DNA methylation marks at four out of seven imprinted genes examined. Embryos derived from these oocytes showed biallelic expression or biallelic suppression of the affected genes and died before mid-gestation. Our results suggest that demethylation of H3K4 is critical for establishing the DNA methylation imprints during oogenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ciccone, David N -- Su, Hui -- Hevi, Sarah -- Gay, Frederique -- Lei, Hong -- Bajko, Jeffrey -- Xu, Guoliang -- Li, En -- Chen, Taiping -- England -- Nature. 2009 Sep 17;461(7262):415-8. doi: 10.1038/nature08315. Epub 2009 Sep 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Epigenetics Program, Novartis Institutes for Biomedical Research, 250 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19727073" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; *DNA Methylation ; Embryo Loss/genetics ; Embryo, Mammalian/metabolism ; Female ; Gene Expression Regulation, Developmental ; Genes, Developmental/genetics ; *Genomic Imprinting ; Histones/*metabolism ; Male ; Mice ; *Mothers ; NIH 3T3 Cells ; Oocytes/metabolism ; Oxidoreductases, N-Demethylating/deficiency/genetics/*metabolism
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  • 98
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    Nature Publishing Group (NPG)
    Publication Date: 2009-02-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baker, Monya -- England -- Nature. 2009 Feb 19;457(7232):941. doi: 10.1038/457941a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19238682" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Ataxia Telangiectasia/*surgery ; Brain Neoplasms/*etiology ; Brain Tissue Transplantation/*adverse effects ; Child ; Clinical Trials as Topic/standards/trends ; Fetal Tissue Transplantation/*adverse effects ; Fetus/cytology ; Humans ; Internationality ; Male ; Moscow ; Neurons/cytology/*transplantation ; Spinal Cord Neoplasms/*etiology ; Stem Cell Transplantation/*adverse effects
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  • 99
    Publication Date: 2009-09-18
    Description: Adaptive radiations often follow the evolution of key traits, such as the origin of the amniotic egg and the subsequent radiation of terrestrial vertebrates. The mechanism by which a species determines the sex of its offspring has been linked to critical ecological and life-history traits but not to major adaptive radiations, in part because sex-determining mechanisms do not fossilize. Here we establish a previously unknown coevolutionary relationship in 94 amniote species between sex-determining mechanism and whether a species bears live young or lays eggs. We use that relationship to predict the sex-determining mechanism in three independent lineages of extinct Mesozoic marine reptiles (mosasaurs, sauropterygians and ichthyosaurs), each of which is known from fossils to have evolved live birth. Our results indicate that each lineage evolved genotypic sex determination before acquiring live birth. This enabled their pelagic radiations, where the relatively stable temperatures of the open ocean constrain temperature-dependent sex determination in amniote species. Freed from the need to move and nest on land, extreme physical adaptations to a pelagic lifestyle evolved in each group, such as the fluked tails, dorsal fins and wing-shaped limbs of ichthyosaurs. With the inclusion of ichthyosaurs, mosasaurs and sauropterygians, genotypic sex determination is present in all known fully pelagic amniote groups (sea snakes, sirenians and cetaceans), suggesting that this mode of sex determination and the subsequent evolution of live birth are key traits required for marine adaptive radiations in amniote lineages.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Organ, Chris L -- Janes, Daniel E -- Meade, Andrew -- Pagel, Mark -- 1 F32 GM075490-01/GM/NIGMS NIH HHS/ -- 5 F32 GM072494/GM/NIGMS NIH HHS/ -- England -- Nature. 2009 Sep 17;461(7262):389-92. doi: 10.1038/nature08350.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Museum of Comparative Zoology, Harvard University, 26 Oxford Street, Cambridge, Massachusetts 02138, USA. corgan@oeb.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19759619" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Physiological/genetics/physiology ; Algorithms ; Animals ; Bayes Theorem ; *Biological Evolution ; *Extinction, Biological ; Female ; Fossils ; Genotype ; History, Ancient ; Male ; Marine Biology ; Markov Chains ; Monte Carlo Method ; Oviposition/genetics/physiology ; Phylogeny ; Reptiles/classification/*genetics/*physiology ; Sex Chromosomes/*genetics ; *Sex Determination Processes ; Sex Ratio ; Temperature ; Viviparity, Nonmammalian/genetics/*physiology
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  • 100
    Publication Date: 2009-02-20
    Description: The response of terrestrial vegetation to a globally changing environment is central to predictions of future levels of atmospheric carbon dioxide. The role of tropical forests is critical because they are carbon-dense and highly productive. Inventory plots across Amazonia show that old-growth forests have increased in carbon storage over recent decades, but the response of one-third of the world's tropical forests in Africa is largely unknown owing to an absence of spatially extensive observation networks. Here we report data from a ten-country network of long-term monitoring plots in African tropical forests. We find that across 79 plots (163 ha) above-ground carbon storage in live trees increased by 0.63 Mg C ha(-1) yr(-1) between 1968 and 2007 (95% confidence interval (CI), 0.22-0.94; mean interval, 1987-96). Extrapolation to unmeasured forest components (live roots, small trees, necromass) and scaling to the continent implies a total increase in carbon storage in African tropical forest trees of 0.34 Pg C yr(-1) (CI, 0.15-0.43). These reported changes in carbon storage are similar to those reported for Amazonian forests per unit area, providing evidence that increasing carbon storage in old-growth forests is a pan-tropical phenomenon. Indeed, combining all standardized inventory data from this study and from tropical America and Asia together yields a comparable figure of 0.49 Mg C ha(-1) yr(-1) (n = 156; 562 ha; CI, 0.29-0.66; mean interval, 1987-97). This indicates a carbon sink of 1.3 Pg C yr(-1) (CI, 0.8-1.6) across all tropical forests during recent decades. Taxon-specific analyses of African inventory and other data suggest that widespread changes in resource availability, such as increasing atmospheric carbon dioxide concentrations, may be the cause of the increase in carbon stocks, as some theory and models predict.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lewis, Simon L -- Lopez-Gonzalez, Gabriela -- Sonke, Bonaventure -- Affum-Baffoe, Kofi -- Baker, Timothy R -- Ojo, Lucas O -- Phillips, Oliver L -- Reitsma, Jan M -- White, Lee -- Comiskey, James A -- Djuikouo K, Marie-Noel -- Ewango, Corneille E N -- Feldpausch, Ted R -- Hamilton, Alan C -- Gloor, Manuel -- Hart, Terese -- Hladik, Annette -- Lloyd, Jon -- Lovett, Jon C -- Makana, Jean-Remy -- Malhi, Yadvinder -- Mbago, Frank M -- Ndangalasi, Henry J -- Peacock, Julie -- Peh, Kelvin S-H -- Sheil, Douglas -- Sunderland, Terry -- Swaine, Michael D -- Taplin, James -- Taylor, David -- Thomas, Sean C -- Votere, Raymond -- Woll, Hannsjorg -- England -- Nature. 2009 Feb 19;457(7232):1003-6. doi: 10.1038/nature07771.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Earth and Biosphere Institute, School of Geography, University of Leeds, Leeds LS2 9JT, UK. s.l.lewis@leeds.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19225523" target="_blank"〉PubMed〈/a〉
    Keywords: Africa ; Atmosphere/chemistry ; Biomass ; Carbon/analysis/*metabolism ; Carbon Dioxide/analysis/metabolism ; Models, Biological ; Trees/anatomy & histology/chemistry/growth & development/*metabolism ; *Tropical Climate ; Wilderness ; Wood/analysis/chemistry
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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