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  • 1
    Publication Date: 2011-07-29
    Description: Severe behavioural deficits in psychiatric diseases such as autism and schizophrenia have been hypothesized to arise from elevations in the cellular balance of excitation and inhibition (E/I balance) within neural microcircuitry. This hypothesis could unify diverse streams of pathophysiological and genetic evidence, but has not been susceptible to direct testing. Here we design and use several novel optogenetic tools to causally investigate the cellular E/I balance hypothesis in freely moving mammals, and explore the associated circuit physiology. Elevation, but not reduction, of cellular E/I balance within the mouse medial prefrontal cortex was found to elicit a profound impairment in cellular information processing, associated with specific behavioural impairments and increased high-frequency power in the 30-80 Hz range, which have both been observed in clinical conditions in humans. Consistent with the E/I balance hypothesis, compensatory elevation of inhibitory cell excitability partially rescued social deficits caused by E/I balance elevation. These results provide support for the elevated cellular E/I balance hypothesis of severe neuropsychiatric disease-related symptoms.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4155501/" 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/PMC4155501/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yizhar, Ofer -- Fenno, Lief E -- Prigge, Matthias -- Schneider, Franziska -- Davidson, Thomas J -- O'Shea, Daniel J -- Sohal, Vikaas S -- Goshen, Inbal -- Finkelstein, Joel -- Paz, Jeanne T -- Stehfest, Katja -- Fudim, Roman -- Ramakrishnan, Charu -- Huguenard, John R -- Hegemann, Peter -- Deisseroth, Karl -- DP1 OD000616/OD/NIH HHS/ -- R01 MH075957/MH/NIMH NIH HHS/ -- R01 MH086373/MH/NIMH NIH HHS/ -- R01 NS006477/NS/NINDS NIH HHS/ -- R01 NS034774/NS/NINDS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2011 Jul 27;477(7363):171-8. doi: 10.1038/nature10360.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Bioengineering, Stanford University, Stanford, California, USA. ofer.yizhar@weizmann.ac.il〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21796121" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Autistic Disorder/physiopathology ; Disease Models, Animal ; HEK293 Cells ; Hippocampus/cytology ; Humans ; Learning ; Mental Disorders/physiopathology ; Mice ; *Models, Neurological ; Motor Activity ; Neural Inhibition/*physiology ; Neurons/*metabolism ; Opsins/metabolism ; Prefrontal Cortex/*physiology/*physiopathology ; Schizophrenia/physiopathology ; *Social Behavior
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2011-01-15
    Description: Infection of chickens with avian influenza virus poses a global threat to both poultry production and human health that is not adequately controlled by vaccination or by biosecurity measures. A novel alternative strategy is to develop chickens that are genetically resistant to infection. We generated transgenic chickens expressing a short-hairpin RNA designed to function as a decoy that inhibits and blocks influenza virus polymerase and hence interferes with virus propagation. Susceptibility to primary challenge with highly pathogenic avian influenza virus and onward transmission dynamics were determined. Although the transgenic birds succumbed to the initial experimental challenge, onward transmission to both transgenic and nontransgenic birds was prevented.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lyall, Jon -- Irvine, Richard M -- Sherman, Adrian -- McKinley, Trevelyan J -- Nunez, Alejandro -- Purdie, Auriol -- Outtrim, Linzy -- Brown, Ian H -- Rolleston-Smith, Genevieve -- Sang, Helen -- Tiley, Laurence -- BB/G00479X/1/Biotechnology and Biological Sciences Research Council/United Kingdom -- BBS/B/00239/Biotechnology and Biological Sciences Research Council/United Kingdom -- BBS/B/00301/Biotechnology and Biological Sciences Research Council/United Kingdom -- New York, N.Y. -- Science. 2011 Jan 14;331(6014):223-6. doi: 10.1126/science.1198020.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge CB3 0ES, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21233391" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Animals, Genetically Modified ; Cell Line ; Chickens/*genetics/virology ; Cloaca/virology ; Influenza A Virus, H5N1 Subtype/enzymology/isolation & purification/*physiology ; Influenza in Birds/*prevention & control/*transmission/virology ; Oropharynx/virology ; RNA Replicase/antagonists & inhibitors/genetics/metabolism ; RNA, Small Interfering/*genetics/metabolism ; RNA, Viral/analysis/genetics/metabolism ; Transfection ; Virus Replication ; Virus Shedding
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2011-07-08
    Description: Reactive oxygen species (ROS) are mutagenic and may thereby promote cancer. Normally, ROS levels are tightly controlled by an inducible antioxidant program that responds to cellular stressors and is predominantly regulated by the transcription factor Nrf2 (also known as Nfe2l2) and its repressor protein Keap1 (refs 2-5). In contrast to the acute physiological regulation of Nrf2, in neoplasia there is evidence for increased basal activation of Nrf2. Indeed, somatic mutations that disrupt the Nrf2-Keap1 interaction to stabilize Nrf2 and increase the constitutive transcription of Nrf2 target genes were recently identified, indicating that enhanced ROS detoxification and additional Nrf2 functions may in fact be pro-tumorigenic. Here, we investigated ROS metabolism in primary murine cells following the expression of endogenous oncogenic alleles of Kras, Braf and Myc, and found that ROS are actively suppressed by these oncogenes. K-Ras(G12D), B-Raf(V619E) and Myc(ERT2) each increased the transcription of Nrf2 to stably elevate the basal Nrf2 antioxidant program and thereby lower intracellular ROS and confer a more reduced intracellular environment. Oncogene-directed increased expression of Nrf2 is a new mechanism for the activation of the Nrf2 antioxidant program, and is evident in primary cells and tissues of mice expressing K-Ras(G12D) and B-Raf(V619E), and in human pancreatic cancer. Furthermore, genetic targeting of the Nrf2 pathway impairs K-Ras(G12D)-induced proliferation and tumorigenesis in vivo. Thus, the Nrf2 antioxidant and cellular detoxification program represents a previously unappreciated mediator of oncogenesis.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3404470/" 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/PMC3404470/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉DeNicola, Gina M -- Karreth, Florian A -- Humpton, Timothy J -- Gopinathan, Aarthi -- Wei, Cong -- Frese, Kristopher -- Mangal, Dipti -- Yu, Kenneth H -- Yeo, Charles J -- Calhoun, Eric S -- Scrimieri, Francesca -- Winter, Jordan M -- Hruban, Ralph H -- Iacobuzio-Donahue, Christine -- Kern, Scott E -- Blair, Ian A -- Tuveson, David A -- CA084291/CA/NCI NIH HHS/ -- CA101973/CA/NCI NIH HHS/ -- CA105490/CA/NCI NIH HHS/ -- CA106610/CA/NCI NIH HHS/ -- CA111294/CA/NCI NIH HHS/ -- CA128920/CA/NCI NIH HHS/ -- CA62924/CA/NCI NIH HHS/ -- R01 CA101973/CA/NCI NIH HHS/ -- R01 CA101973-05/CA/NCI NIH HHS/ -- Cancer Research UK/United Kingdom -- England -- Nature. 2011 Jul 6;475(7354):106-9. doi: 10.1038/nature10189.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Li Ka Shing Centre, Cancer Research UK Cambridge Institute, Robinson Way, Cambridge CB2 0RE, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21734707" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing/genetics/metabolism ; Alleles ; Animals ; Antioxidants/metabolism ; Cell Line, Tumor ; Cell Proliferation ; Cell Transformation, Neoplastic/genetics/*metabolism/*pathology ; Cells, Cultured ; Cytoskeletal Proteins/genetics/metabolism ; Extracellular Signal-Regulated MAP Kinases/metabolism ; Fibroblasts/metabolism ; Genes, myc/genetics ; Humans ; Intracellular Signaling Peptides and Proteins/genetics/metabolism ; JNK Mitogen-Activated Protein Kinases/metabolism ; MAP Kinase Signaling System ; Mice ; Mitogen-Activated Protein Kinase Kinases/metabolism ; NF-E2-Related Factor 2/deficiency/genetics/*metabolism ; NIH 3T3 Cells ; Oncogenes/*genetics ; Oxidation-Reduction ; Pancreatic Neoplasms/genetics/*metabolism/*pathology ; Proto-Oncogene Proteins B-raf/genetics/metabolism ; Proto-Oncogene Proteins p21(ras)/genetics/metabolism ; Reactive Oxygen Species/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2011-01-21
    Description: Cutaneous malignant melanoma is a highly aggressive and frequently chemoresistant cancer, the incidence of which continues to rise. Epidemiological studies show that the major aetiological melanoma risk factor is ultraviolet (UV) solar radiation, with the highest risk associated with intermittent burning doses, especially during childhood. We have experimentally validated these epidemiological findings using the hepatocyte growth factor/scatter factor transgenic mouse model, which develops lesions in stages highly reminiscent of human melanoma with respect to biological, genetic and aetiological criteria, but only when irradiated as neonatal pups with UVB, not UVA. However, the mechanisms underlying UVB-initiated, neonatal-specific melanomagenesis remain largely unknown. Here we introduce a mouse model permitting fluorescence-aided melanocyte imaging and isolation following in vivo UV irradiation. We use expression profiling to show that activated neonatal skin melanocytes isolated following a melanomagenic UVB dose bear a distinct, persistent interferon response signature, including genes associated with immunoevasion. UVB-induced melanocyte activation, characterized by aberrant growth and migration, was abolished by antibody-mediated systemic blockade of interferon-gamma (IFN-gamma), but not type-I interferons. IFN-gamma was produced by macrophages recruited to neonatal skin by UVB-induced ligands to the chemokine receptor Ccr2. Admixed recruited skin macrophages enhanced transplanted melanoma growth by inhibiting apoptosis; notably, IFN-gamma blockade abolished macrophage-enhanced melanoma growth and survival. IFN-gamma-producing macrophages were also identified in 70% of human melanomas examined. Our data reveal an unanticipated role for IFN-gamma in promoting melanocytic cell survival/immunoevasion, identifying a novel candidate therapeutic target for a subset of melanoma patients.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3140101/" 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/PMC3140101/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zaidi, M Raza -- Davis, Sean -- Noonan, Frances P -- Graff-Cherry, Cari -- Hawley, Teresa S -- Walker, Robert L -- Feigenbaum, Lionel -- Fuchs, Elaine -- Lyakh, Lyudmila -- Young, Howard A -- Hornyak, Thomas J -- Arnheiter, Heinz -- Trinchieri, Giorgio -- Meltzer, Paul S -- De Fabo, Edward C -- Merlino, Glenn -- CA53765/CA/NCI NIH HHS/ -- CA92258/CA/NCI NIH HHS/ -- R01 CA053765-10S1/CA/NCI NIH HHS/ -- R01 CA092258-05/CA/NCI NIH HHS/ -- Intramural NIH HHS/ -- England -- Nature. 2011 Jan 27;469(7331):548-53. doi: 10.1038/nature09666. Epub 2011 Jan 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Cancer Biology and Genetics, National Cancer Institute, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21248750" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Disease Models, Animal ; Female ; Gene Expression Profiling ; Gene Expression Regulation, Developmental/radiation effects ; Humans ; Interferon-gamma/*metabolism ; Macrophages/metabolism/radiation effects ; Male ; Melanocytes/*metabolism/radiation effects ; Melanoma/*physiopathology ; Mice ; *Ultraviolet Rays
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 5
    Publication Date: 2011-03-25
    Description: The most common mutation in human melanoma, BRAF(V600E), activates the serine/threonine kinase BRAF and causes excessive activity in the mitogen-activated protein kinase pathway. BRAF(V600E) mutations are also present in benign melanocytic naevi, highlighting the importance of additional genetic alterations in the genesis of malignant tumours. Such changes include recurrent copy number variations that result in the amplification of oncogenes. For certain amplifications, the large number of genes in the interval has precluded an understanding of the cooperating oncogenic events. Here we have used a zebrafish melanoma model to test genes in a recurrently amplified region of chromosome 1 for the ability to cooperate with BRAF(V600E) and accelerate melanoma. SETDB1, an enzyme that methylates histone H3 on lysine 9 (H3K9), was found to accelerate melanoma formation significantly in zebrafish. Chromatin immunoprecipitation coupled with massively parallel DNA sequencing and gene expression analyses uncovered genes, including HOX genes, that are transcriptionally dysregulated in response to increased levels of SETDB1. Our studies establish SETDB1 as an oncogene in melanoma and underscore the role of chromatin factors in regulating tumorigenesis.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3348545/" 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/PMC3348545/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ceol, Craig J -- Houvras, Yariv -- Jane-Valbuena, Judit -- Bilodeau, Steve -- Orlando, David A -- Battisti, Valentine -- Fritsch, Lauriane -- Lin, William M -- Hollmann, Travis J -- Ferre, Fabrizio -- Bourque, Caitlin -- Burke, Christopher J -- Turner, Laura -- Uong, Audrey -- Johnson, Laura A -- Beroukhim, Rameen -- Mermel, Craig H -- Loda, Massimo -- Ait-Si-Ali, Slimane -- Garraway, Levi A -- Young, Richard A -- Zon, Leonard I -- CA103846/CA/NCI NIH HHS/ -- CA146455/CA/NCI NIH HHS/ -- DK055381/DK/NIDDK NIH HHS/ -- HG002668/HG/NHGRI NIH HHS/ -- K08 DK075432/DK/NIDDK NIH HHS/ -- K08 DK075432-04/DK/NIDDK NIH HHS/ -- K08DK075432-04/DK/NIDDK NIH HHS/ -- K99AR056899-02/AR/NIAMS NIH HHS/ -- R00 AR056899/AR/NIAMS NIH HHS/ -- R00 AR056899-02/AR/NIAMS NIH HHS/ -- R01 CA103846/CA/NCI NIH HHS/ -- R01 CA103846-09/CA/NCI NIH HHS/ -- R01 CA146445/CA/NCI NIH HHS/ -- R01 CA146445-03/CA/NCI NIH HHS/ -- R01 HG002668/HG/NHGRI NIH HHS/ -- R01 HG002668-08/HG/NHGRI NIH HHS/ -- T32 GM007753/GM/NIGMS NIH HHS/ -- Canadian Institutes of Health Research/Canada -- Howard Hughes Medical Institute/ -- England -- Nature. 2011 Mar 24;471(7339):513-7. doi: 10.1038/nature09806.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Stem Cell Program and Hematology/Oncology, Children's Hospital Boston, Howard Hughes Medical Institute, Harvard Medical School, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21430779" target="_blank"〉PubMed〈/a〉
    Keywords: Age of Onset ; Amino Acid Substitution ; Animals ; Animals, Genetically Modified ; Cell Transformation, Neoplastic/genetics ; Chromatin Immunoprecipitation ; Chromosomes, Human, Pair 1/genetics ; DNA Copy Number Variations/*genetics ; Disease Models, Animal ; Gene Amplification/*genetics ; Gene Expression Profiling ; Gene Expression Regulation, Neoplastic/genetics ; Genes, Homeobox/genetics ; Histone-Lysine N-Methyltransferase/*genetics/metabolism ; Humans ; Melanocytes/cytology/enzymology/metabolism/pathology ; Melanoma/enzymology/*genetics/*pathology ; Nevus/enzymology ; Oncogenes/genetics ; Protein Methyltransferases/*genetics/*metabolism ; Proto-Oncogene Proteins B-raf/chemistry/genetics/metabolism ; Zebrafish/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 2011-03-25
    Description: Multiple myeloma is an incurable malignancy of plasma cells, and its pathogenesis is poorly understood. Here we report the massively parallel sequencing of 38 tumour genomes and their comparison to matched normal DNAs. Several new and unexpected oncogenic mechanisms were suggested by the pattern of somatic mutation across the data set. These include the mutation of genes involved in protein translation (seen in nearly half of the patients), genes involved in histone methylation, and genes involved in blood coagulation. In addition, a broader than anticipated role of NF-kappaB signalling was indicated by mutations in 11 members of the NF-kappaB pathway. Of potential immediate clinical relevance, activating mutations of the kinase BRAF were observed in 4% of patients, suggesting the evaluation of BRAF inhibitors in multiple myeloma clinical trials. These results indicate that cancer genome sequencing of large collections of samples will yield new insights into cancer not anticipated by existing knowledge.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3560292/" 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/PMC3560292/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chapman, Michael A -- Lawrence, Michael S -- Keats, Jonathan J -- Cibulskis, Kristian -- Sougnez, Carrie -- Schinzel, Anna C -- Harview, Christina L -- Brunet, Jean-Philippe -- Ahmann, Gregory J -- Adli, Mazhar -- Anderson, Kenneth C -- Ardlie, Kristin G -- Auclair, Daniel -- Baker, Angela -- Bergsagel, P Leif -- Bernstein, Bradley E -- Drier, Yotam -- Fonseca, Rafael -- Gabriel, Stacey B -- Hofmeister, Craig C -- Jagannath, Sundar -- Jakubowiak, Andrzej J -- Krishnan, Amrita -- Levy, Joan -- Liefeld, Ted -- Lonial, Sagar -- Mahan, Scott -- Mfuko, Bunmi -- Monti, Stefano -- Perkins, Louise M -- Onofrio, Robb -- Pugh, Trevor J -- Rajkumar, S Vincent -- Ramos, Alex H -- Siegel, David S -- Sivachenko, Andrey -- Stewart, A Keith -- Trudel, Suzanne -- Vij, Ravi -- Voet, Douglas -- Winckler, Wendy -- Zimmerman, Todd -- Carpten, John -- Trent, Jeff -- Hahn, William C -- Garraway, Levi A -- Meyerson, Matthew -- Lander, Eric S -- Getz, Gad -- Golub, Todd R -- K12 CA133250/CA/NCI NIH HHS/ -- R01 AG020686/AG/NIA NIH HHS/ -- R01 AG020686-07/AG/NIA NIH HHS/ -- R01 CA133115/CA/NCI NIH HHS/ -- R01 CA133115-04/CA/NCI NIH HHS/ -- R01 CA133966/CA/NCI NIH HHS/ -- R01 CA133966-03/CA/NCI NIH HHS/ -- England -- Nature. 2011 Mar 24;471(7339):467-72. doi: 10.1038/nature09837.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Eli and Edythe L. Broad Institute, 7 Cambridge Center, Cambridge, Massachusetts 02412, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21430775" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Blood Coagulation/genetics ; CpG Islands/genetics ; DNA Mutational Analysis ; DNA Repair/genetics ; Exons/genetics ; Exosome Multienzyme Ribonuclease Complex ; Genome, Human/*genetics ; Genomics ; Histones/metabolism ; Homeodomain Proteins/genetics ; Homeostasis/genetics ; Humans ; Methylation ; Models, Molecular ; Molecular Sequence Data ; Multiple Myeloma/drug therapy/enzymology/*genetics/metabolism ; Mutation/*genetics ; NF-kappa B/metabolism ; Oncogenes/genetics ; Open Reading Frames/genetics ; Protein Biosynthesis/genetics ; Protein Conformation ; Proto-Oncogene Proteins B-raf/antagonists & inhibitors/genetics/metabolism ; RNA Processing, Post-Transcriptional/genetics ; Ribonucleases/chemistry/genetics ; Signal Transduction/genetics ; Transcription, Genetic/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 2011-05-31
    Description: The four-chambered mammalian heart develops from two fields of cardiac progenitor cells distinguished by their spatiotemporal patterns of differentiation and contributions to the definitive heart. The first heart field differentiates earlier in lateral plate mesoderm, generates the linear heart tube and ultimately gives rise to the left ventricle. The second heart field (SHF) differentiates later in pharyngeal mesoderm, elongates the heart tube, and gives rise to the outflow tract and much of the right ventricle. Because hearts in lower vertebrates contain a rudimentary outflow tract but not a right ventricle, the existence and function of SHF-like cells in these species has remained a topic of speculation. Here we provide direct evidence from Cre/Lox-mediated lineage tracing and loss-of-function studies in zebrafish, a lower vertebrate with a single ventricle, that latent TGF-beta binding protein 3 (ltbp3) transcripts mark a field of cardiac progenitor cells with defining characteristics of the anterior SHF in mammals. Specifically, ltbp3(+) cells differentiate in pharyngeal mesoderm after formation of the heart tube, elongate the heart tube at the outflow pole, and give rise to three cardiovascular lineages in the outflow tract and myocardium in the distal ventricle. In addition to expressing Ltbp3, a protein that regulates the bioavailability of TGF-beta ligands, zebrafish SHF cells co-express nkx2.5, an evolutionarily conserved marker of cardiac progenitor cells in both fields. Embryos devoid of ltbp3 lack the same cardiac structures derived from ltbp3(+) cells due to compromised progenitor proliferation. Furthermore, small-molecule inhibition of TGF-beta signalling phenocopies the ltbp3-morphant phenotype whereas expression of a constitutively active TGF-beta type I receptor rescues it. Taken together, our findings uncover a requirement for ltbp3-TGF-beta signalling during zebrafish SHF development, a process that serves to enlarge the single ventricular chamber in this species.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3319150/" 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/PMC3319150/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhou, Yong -- Cashman, Timothy J -- Nevis, Kathleen R -- Obregon, Pablo -- Carney, Sara A -- Liu, Yan -- Gu, Aihua -- Mosimann, Christian -- Sondalle, Samuel -- Peterson, Richard E -- Heideman, Warren -- Burns, Caroline E -- Burns, C Geoffrey -- 5R01HL096816/HL/NHLBI NIH HHS/ -- R01 ES012716/ES/NIEHS NIH HHS/ -- R01 HL096816/HL/NHLBI NIH HHS/ -- R01 HL096816-03/HL/NHLBI NIH HHS/ -- T32 GM007205/GM/NIGMS NIH HHS/ -- England -- Nature. 2011 May 29;474(7353):645-8. doi: 10.1038/nature10094.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cardiovascular Research Center, Massachusetts General Hospital, Charlestown, Massachusetts 02129, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21623370" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cardiovascular Abnormalities/embryology ; Cell Lineage ; Gene Knockdown Techniques ; Heart/*embryology ; Latent TGF-beta Binding Proteins/*metabolism ; Molecular Sequence Data ; Myocardium/cytology/*metabolism ; Phenotype ; Signal Transduction ; Transcription Factors/metabolism ; Zebrafish/*embryology/genetics ; Zebrafish Proteins/metabolism
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
    Publication Date: 2011-10-14
    Description: The naked mole rat (Heterocephalus glaber) is a strictly subterranean, extraordinarily long-lived eusocial mammal. Although it is the size of a mouse, its maximum lifespan exceeds 30 years, making this animal the longest-living rodent. Naked mole rats show negligible senescence, no age-related increase in mortality, and high fecundity until death. In addition to delayed ageing, they are resistant to both spontaneous cancer and experimentally induced tumorigenesis. Naked mole rats pose a challenge to the theories that link ageing, cancer and redox homeostasis. Although characterized by significant oxidative stress, the naked mole rat proteome does not show age-related susceptibility to oxidative damage or increased ubiquitination. Naked mole rats naturally reside in large colonies with a single breeding female, the 'queen', who suppresses the sexual maturity of her subordinates. They also live in full darkness, at low oxygen and high carbon dioxide concentrations, and are unable to sustain thermogenesis nor feel certain types of pain. Here we report the sequencing and analysis of the naked mole rat genome, which reveals unique genome features and molecular adaptations consistent with cancer resistance, poikilothermy, hairlessness and insensitivity to low oxygen, and altered visual function, circadian rythms and taste sensing. This information provides insights into the naked mole rat's exceptional longevity and ability to live in hostile conditions, in the dark and at low oxygen. The extreme traits of the naked mole rat, together with the reported genome and transcriptome information, offer opportunities for understanding ageing and advancing other areas of biological and biomedical research.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3319411/" 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/PMC3319411/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kim, Eun Bae -- Fang, Xiaodong -- Fushan, Alexey A -- Huang, Zhiyong -- Lobanov, Alexei V -- Han, Lijuan -- Marino, Stefano M -- Sun, Xiaoqing -- Turanov, Anton A -- Yang, Pengcheng -- Yim, Sun Hee -- Zhao, Xiang -- Kasaikina, Marina V -- Stoletzki, Nina -- Peng, Chunfang -- Polak, Paz -- Xiong, Zhiqiang -- Kiezun, Adam -- Zhu, Yabing -- Chen, Yuanxin -- Kryukov, Gregory V -- Zhang, Qiang -- Peshkin, Leonid -- Yang, Lan -- Bronson, Roderick T -- Buffenstein, Rochelle -- Wang, Bo -- Han, Changlei -- Li, Qiye -- Chen, Li -- Zhao, Wei -- Sunyaev, Shamil R -- Park, Thomas J -- Zhang, Guojie -- Wang, Jun -- Gladyshev, Vadim N -- AG021518/AG/NIA NIH HHS/ -- AG038004/AG/NIA NIH HHS/ -- CA080946/CA/NCI NIH HHS/ -- R01 AG021518/AG/NIA NIH HHS/ -- R01 AG021518-10/AG/NIA NIH HHS/ -- R01 AG038004/AG/NIA NIH HHS/ -- R01 AG038004-02/AG/NIA NIH HHS/ -- R01 CA080946/CA/NCI NIH HHS/ -- R01 CA080946-11/CA/NCI NIH HHS/ -- England -- Nature. 2011 Oct 12;479(7372):223-7. doi: 10.1038/nature10533.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Bioinspired Science, Ewha Womans University, Seoul, 120-750, Korea.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21993625" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Physiological/*genetics ; Aging/genetics ; Amino Acid Sequence ; Animals ; Body Temperature Regulation/genetics ; Carbon Dioxide/analysis/metabolism ; Circadian Rhythm/genetics ; Darkness ; Genes/genetics ; Genome/*genetics ; Genomic Instability/genetics ; Genomics ; Humans ; Ion Channels/genetics ; Longevity/*genetics/physiology ; Male ; Mitochondrial Proteins/genetics ; Mole Rats/*genetics/*physiology ; Molecular Sequence Data ; Mutagenesis/genetics ; Oxygen/analysis/metabolism ; Taste/genetics ; Transcriptome/genetics ; Visual Perception/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 9
    Publication Date: 2011-10-21
    Description: Chromatin modifiers regulate lifespan in several organisms, raising the question of whether changes in chromatin states in the parental generation could be incompletely reprogrammed in the next generation and thereby affect the lifespan of descendants. The histone H3 lysine 4 trimethylation (H3K4me3) complex, composed of ASH-2, WDR-5 and the histone methyltransferase SET-2, regulates Caenorhabditis elegans lifespan. Here we show that deficiencies in the H3K4me3 chromatin modifiers ASH-2, WDR-5 or SET-2 in the parental generation extend the lifespan of descendants up until the third generation. The transgenerational inheritance of lifespan extension by members of the ASH-2 complex is dependent on the H3K4me3 demethylase RBR-2, and requires the presence of a functioning germline in the descendants. Transgenerational inheritance of lifespan is specific for the H3K4me3 methylation complex and is associated with epigenetic changes in gene expression. Thus, manipulation of specific chromatin modifiers only in parents can induce an epigenetic memory of longevity in descendants.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3368121/" 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/PMC3368121/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Greer, Eric L -- Maures, Travis J -- Ucar, Duygu -- Hauswirth, Anna G -- Mancini, Elena -- Lim, Jana P -- Benayoun, Berenice A -- Shi, Yang -- Brunet, Anne -- ARRA-AG31198/AG/NIA NIH HHS/ -- F32-AG037254/AG/NIA NIH HHS/ -- R01 AG031198/AG/NIA NIH HHS/ -- R01-AG31198/AG/NIA NIH HHS/ -- R01-GM058012/GM/NIGMS NIH HHS/ -- T32 CA009302/CA/NCI NIH HHS/ -- T32-CA009361/CA/NCI NIH HHS/ -- T32-MH020016/MH/NIMH NIH HHS/ -- England -- Nature. 2011 Oct 19;479(7373):365-71. doi: 10.1038/nature10572.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, Stanford University, 300 Pasteur Drive, Stanford, California 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22012258" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Caenorhabditis elegans/*genetics/*physiology ; Caenorhabditis elegans Proteins/genetics/metabolism ; Chromatin/metabolism ; Epigenesis, Genetic/*genetics ; Female ; Gene Expression Regulation ; Gene Knockdown Techniques ; Histone Demethylases/genetics/metabolism ; Histone-Lysine N-Methyltransferase/deficiency/genetics/metabolism ; Histones ; *Inheritance Patterns ; Longevity/*genetics/physiology ; Male ; Methylation ; Mutation/genetics ; Nuclear Proteins/genetics/metabolism ; Pedigree ; Retinoblastoma-Binding Protein 2/genetics/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2011-04-29
    Description: Site-specific recognition of DNA in eukaryotic organisms depends on the arrangement of nucleosomes in chromatin. In the yeast Saccharomyces cerevisiae, ISW1a and related chromatin remodelling factors are implicated in establishing the nucleosome repeat during replication and altering nucleosome position to affect gene activity. Here we have solved the crystal structures of S. cerevisiae ISW1a lacking its ATPase domain both alone and with DNA bound at resolutions of 3.25 A and 3.60 A, respectively, and we have visualized two different nucleosome-containing remodelling complexes using cryo-electron microscopy. The composite X-ray and electron microscopy structures combined with site-directed photocrosslinking analyses of these complexes suggest that ISW1a uses a dinucleosome substrate for chromatin remodelling. Results from a remodelling assay corroborate the dinucleosome model. We show how a chromatin remodelling factor could set the spacing between two adjacent nucleosomes acting as a 'protein ruler'.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yamada, Kazuhiro -- Frouws, Timothy D -- Angst, Brigitte -- Fitzgerald, Daniel J -- DeLuca, Carl -- Schimmele, Kyoko -- Sargent, David F -- Richmond, Timothy J -- England -- Nature. 2011 Apr 28;472(7344):448-53. doi: 10.1038/nature09947.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉ETH Zurich, Institute of Molecular Biology and Biophysics, Schafmattstr. 20, CH-8093 Zurich, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21525927" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphatases/*chemistry/*metabolism ; Animals ; *Chromatin Assembly and Disassembly ; Cryoelectron Microscopy ; Crystallography, X-Ray ; DNA/chemistry/genetics/metabolism ; DNA-Binding Proteins/*chemistry/*metabolism ; Models, Biological ; Models, Molecular ; Nucleosomes/chemistry/genetics/*metabolism ; Protein Conformation ; Saccharomyces cerevisiae/*chemistry/genetics ; Saccharomyces cerevisiae Proteins/*chemistry/*metabolism ; Xenopus laevis
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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