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  • Animals  (4,976)
  • 2005-2009  (4,976)
  • 1925-1929
  • 101
    Publication Date: 2008-04-04
    Description: In vertebrate oocytes, meiotic progression is driven by the sequential translational activation of maternal messenger RNAs stored in the cytoplasm. This activation is mainly induced by the cytoplasmic elongation of their poly(A) tails, which is mediated by the cytoplasmic polyadenylation element (CPE) present in their 3' untranslated regions. In Xenopus oocytes, sequential phase-specific translation of CPE-regulated mRNAs is required to activate the maturation-promoting factor, which in turn mediates entry into the two consecutive meiotic metaphases (MI and MII). Here we report a genome-wide functional screening to identify previously unknown mRNAs cytoplasmically polyadenylated at meiotic phase transitions. A significant fraction of transcripts containing, in addition to CPEs, (A + U)-rich element (ARE) sequences (characteristic of mRNAs regulated by deadenylation) were identified. Among these is the mRNA encoding C3H-4, an ARE-binding protein that we find to accumulate in MI and the ablation of which induces meiotic arrest. Our results suggest that C3H-4 recruits the CCR4 deadenylase complex to ARE-containing mRNAs and this, in turn, causes shortening of poly(A) tails. We also show that the opposing activities of the CPEs and the AREs define the precise activation times of the mRNAs encoding the anaphase-promoting complex inhibitors Emi1 and Emi2 during distinct phases of the meiotic cycle. Taken together, our results show that an 'early' wave of cytoplasmic polyadenylation activates a negative feedback loop by activating the synthesis of C3H-4, which in turn would recruit the deadenylase complex to mRNAs containing both CPEs and AREs. This negative feedback loop is required to exit from metaphase into interkinesis and for meiotic progression.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Belloc, Eulalia -- Mendez, Raul -- England -- Nature. 2008 Apr 24;452(7190):1017-21. doi: 10.1038/nature06809. Epub 2008 Apr 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Genomic Regulation (CRG), Pompeu Fabra University (UPF), C/Dr Aiguader 88, 08003, Barcelona, Spain.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18385675" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Cycle Proteins/genetics ; F-Box Proteins/genetics ; Feedback, Physiological/*genetics ; Female ; Genome/genetics ; *Meiosis/genetics ; *Metaphase ; Oocytes/*cytology/metabolism ; Phosphoproteins/biosynthesis/genetics/metabolism ; *Polyadenylation/genetics ; Protein Biosynthesis/genetics ; RNA, Messenger/genetics/metabolism ; Transcription Factors/metabolism ; Xenopus Proteins/biosynthesis/genetics/metabolism ; Xenopus laevis ; mRNA Cleavage and Polyadenylation Factors/metabolism
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  • 102
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    Nature Publishing Group (NPG)
    Publication Date: 2008-05-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Courtland, Rachel -- England -- Nature. 2008 May 22;453(7194):432-3. doi: 10.1038/453432a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18497777" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arctic Regions ; Conservation of Natural Resources/*legislation & jurisprudence/trends ; *Greenhouse Effect ; *Ice Cover ; Internationality ; Population Density ; Time Factors ; United States ; Ursidae/*physiology
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  • 103
    Publication Date: 2008-09-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Glass, Christopher K -- Saijo, Kaoru -- England -- Nature. 2008 Sep 4;455(7209):40-1. doi: 10.1038/455040a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18769427" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Division ; Cholesterol/biosynthesis/*metabolism ; DNA-Binding Proteins/deficiency/*metabolism ; Lymphocyte Activation ; Mice ; Orphan Nuclear Receptors ; Receptors, Cytoplasmic and Nuclear/deficiency/*metabolism ; Sulfotransferases/metabolism ; T-Lymphocytes/*cytology/*immunology/metabolism
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  • 104
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    Nature Publishing Group (NPG)
    Publication Date: 2008-11-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Glaze, Chris M -- Troyer, Todd -- England -- Nature. 2008 Nov 13;456(7219):187-8. doi: 10.1038/456187a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19005545" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cold Temperature ; Finches/*physiology ; High Vocal Center/physiology ; Time Factors ; Vocalization, Animal/*physiology
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  • 105
    Publication Date: 2008-07-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Janvier, Philippe -- England -- Nature. 2008 Jul 10;454(7201):169-70. doi: 10.1038/454169a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18615071" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Eye/*anatomy & histology/*growth & development ; Flounder/*anatomy & histology/*growth & development/physiology ; *Fossils
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  • 106
    Publication Date: 2008-10-03
    Description: The integrity of the cornea, the most anterior part of the eye, is indispensable for vision. Forty-five million individuals worldwide are bilaterally blind and another 135 million have severely impaired vision in both eyes because of loss of corneal transparency; treatments range from local medications to corneal transplants, and more recently to stem cell therapy. The corneal epithelium is a squamous epithelium that is constantly renewing, with a vertical turnover of 7 to 14 days in many mammals. Identification of slow cycling cells (label-retaining cells) in the limbus of the mouse has led to the notion that the limbus is the niche for the stem cells responsible for the long-term renewal of the cornea; hence, the corneal epithelium is supposedly renewed by cells generated at and migrating from the limbus, in marked opposition to other squamous epithelia in which each resident stem cell has in charge a limited area of epithelium. Here we show that the corneal epithelium of the mouse can be serially transplanted, is self-maintained and contains oligopotent stem cells with the capacity to generate goblet cells if provided with a conjunctival environment. Furthermore, the entire ocular surface of the pig, including the cornea, contains oligopotent stem cells (holoclones) with the capacity to generate individual colonies of corneal and conjunctival cells. Therefore, the limbus is not the only niche for corneal stem cells and corneal renewal is not different from other squamous epithelia. We propose a model that unifies our observations with the literature and explains why the limbal region is enriched in stem cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Majo, Francois -- Rochat, Ariane -- Nicolas, Michael -- Jaoude, Georges Abou -- Barrandon, Yann -- England -- Nature. 2008 Nov 13;456(7219):250-4. doi: 10.1038/nature07406. Epub 2008 Oct 1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Stem Cell Dynamics, Ecole Polytechnique Federale de Lausanne (EPFL), 1015 Lausanne CH, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18830243" target="_blank"〉PubMed〈/a〉
    Keywords: Adult Stem Cells/*cytology ; Animals ; Cattle ; Cells, Cultured ; Child, Preschool ; Clone Cells ; Corneal Transplantation ; Epithelium, Corneal/*cytology/metabolism ; Female ; Gene Expression Regulation ; Humans ; Infant ; Keratinocytes/cytology/metabolism ; Male ; Mice ; Mice, SCID ; Models, Biological ; Multipotent Stem Cells/*cytology ; Proteins/metabolism ; Rats ; Swine
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  • 107
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    Nature Publishing Group (NPG)
    Publication Date: 2008-09-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Powell, Kendall -- England -- Nature. 2008 Sep 25;455(7212):455-8. doi: 10.1038/455455a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18818627" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Awards and Prizes ; Creativity ; Elephants/physiology ; *Foundations/economics ; Greenhouse Effect ; Hand/physiology ; History, 20th Century ; History, 21st Century ; Humans ; Hybridization, Genetic ; Illinois ; Neurosciences ; *Research Personnel/economics/psychology ; Robotics ; *Science/economics ; Selection, Genetic
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  • 108
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    Nature Publishing Group (NPG)
    Publication Date: 2008-02-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Maher, Brendan -- England -- Nature. 2008 Feb 28;451(7182):1042-6. doi: 10.1038/4511042a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18305518" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Clinical Trials as Topic/trends ; Drug Industry/economics ; Humans ; Malaria/immunology/parasitology/*prevention & control ; *Malaria Vaccines/economics/genetics/immunology ; Protozoan Proteins/chemistry/genetics/immunology ; Sporozoites/chemistry/immunology
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  • 109
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    Nature Publishing Group (NPG)
    Publication Date: 2008-08-01
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Soengas, Maria S -- England -- Nature. 2008 Jul 31;454(7204):586-7. doi: 10.1038/454586a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18668094" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apoptosis/genetics ; CCAAT-Enhancer-Binding Proteins/genetics/metabolism ; Cell Aging/genetics ; Humans ; Interleukin-6/genetics ; Interleukin-8/genetics ; Mice ; NF-kappa B/metabolism ; Neoplasms/genetics/*immunology/metabolism/*pathology ; Proto-Oncogene Proteins B-raf/genetics/metabolism ; Receptors, Interleukin-8B/genetics
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  • 110
    Publication Date: 2008-01-22
    Description: Understanding the mechanisms that determine an individual's sex remains a primary challenge for evolutionary biology. Chromosome-based systems (genotypic sex determination) that generate roughly equal numbers of sons and daughters accord with theory, but the adaptive significance of environmental sex determination (that is, when embryonic environmental conditions determine offspring sex, ESD) is a major unsolved problem. Theoretical models predict that selection should favour ESD over genotypic sex determination when the developmental environment differentially influences male versus female fitness (that is, the Charnov-Bull model), but empirical evidence for this hypothesis remains elusive in amniote vertebrates--the clade in which ESD is most prevalent. Here we provide the first substantial empirical support for this model by showing that incubation temperatures influence reproductive success of males differently than that of females in a short-lived lizard (Amphibolurus muricatus, Agamidae) with temperature-dependent sex determination. We incubated eggs at a variety of temperatures, and de-confounded sex and incubation temperature by using hormonal manipulations to embryos. We then raised lizards in field enclosures and quantified their lifetime reproductive success. Incubation temperature affected reproductive success differently in males versus females in exactly the way predicted by theory: the fitness of each sex was maximized by the incubation temperature that produces that sex. Our results provide unequivocal empirical support for the Charnov-Bull model for the adaptive significance of temperature-dependent sex determination in amniote vertebrates.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warner, D A -- Shine, R -- England -- Nature. 2008 Jan 31;451(7178):566-8. doi: 10.1038/nature06519. Epub 2008 Jan 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Biological Sciences, University of Sydney, Sydney, New South Wales 2006, Australia. dwarner@iastate.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18204437" target="_blank"〉PubMed〈/a〉
    Keywords: Acclimatization/physiology ; Adaptation, Physiological/*physiology ; Animals ; Body Size ; Fadrozole/pharmacology ; Female ; Lizards/*embryology/*physiology ; Male ; Models, Biological ; Ovum/drug effects/growth & development ; Reproduction/physiology ; Sex Characteristics ; Sex Differentiation/*physiology ; *Temperature
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  • 111
    Publication Date: 2008-07-18
    Description: Internal brain states form key determinants for sensory perception, sensorimotor coordination and learning. A prominent reflection of different brain states in the mammalian central nervous system is the presence of distinct patterns of cortical synchrony, as revealed by extracellular recordings of the electroencephalogram, local field potential and action potentials. Such temporal correlations of cortical activity are thought to be fundamental mechanisms of neuronal computation. However, it is unknown how cortical synchrony is reflected in the intracellular membrane potential (V(m)) dynamics of behaving animals. Here we show, using dual whole-cell recordings from layer 2/3 primary somatosensory barrel cortex in behaving mice, that the V(m) of nearby neurons is highly correlated during quiet wakefulness. However, when the mouse is whisking, an internally generated state change reduces the V(m) correlation, resulting in a desynchronized local field potential and electroencephalogram. Action potential activity was sparse during both quiet wakefulness and active whisking. Single action potentials were driven by a large, brief and specific excitatory input that was not present in the V(m) of neighbouring cells. Action potential initiation occurs with a higher signal-to-noise ratio during active whisking than during quiet periods. Therefore, we show that an internal brain state dynamically regulates cortical membrane potential synchrony during behaviour and defines different modes of cortical processing.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Poulet, James F A -- Petersen, Carl C H -- England -- Nature. 2008 Aug 14;454(7206):881-5. doi: 10.1038/nature07150. Epub 2008 Jul 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Sensory Processing, Brain Mind Institute, Faculty of Life Sciences, Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18633351" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Electroencephalography ; Exploratory Behavior/*physiology ; Male ; Membrane Potentials/*physiology ; Mice ; Mice, Inbred C57BL ; Neurons/*physiology ; Somatosensory Cortex/*physiology ; Wakefulness/*physiology
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  • 112
    Publication Date: 2008-07-03
    Description: G-protein-coupled receptors have a major role in transmembrane signalling in most eukaryotes and many are important drug targets. Here we report the 2.7 A resolution crystal structure of a beta(1)-adrenergic receptor in complex with the high-affinity antagonist cyanopindolol. The modified turkey (Meleagris gallopavo) receptor was selected to be in its antagonist conformation and its thermostability improved by earlier limited mutagenesis. The ligand-binding pocket comprises 15 side chains from amino acid residues in 4 transmembrane alpha-helices and extracellular loop 2. This loop defines the entrance of the ligand-binding pocket and is stabilized by two disulphide bonds and a sodium ion. Binding of cyanopindolol to the beta(1)-adrenergic receptor and binding of carazolol to the beta(2)-adrenergic receptor involve similar interactions. A short well-defined helix in cytoplasmic loop 2, not observed in either rhodopsin or the beta(2)-adrenergic receptor, directly interacts by means of a tyrosine with the highly conserved DRY motif at the end of helix 3 that is essential for receptor activation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2923055/" 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/PMC2923055/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warne, Tony -- Serrano-Vega, Maria J -- Baker, Jillian G -- Moukhametzianov, Rouslan -- Edwards, Patricia C -- Henderson, Richard -- Leslie, Andrew G W -- Tate, Christopher G -- Schertler, Gebhard F X -- MC_U105178937/Medical Research Council/United Kingdom -- MC_U105184322/Medical Research Council/United Kingdom -- MC_U105184325/Medical Research Council/United Kingdom -- MC_U105197215/Medical Research Council/United Kingdom -- U.1051.04.020(78937)/Medical Research Council/United Kingdom -- Wellcome Trust/United Kingdom -- England -- Nature. 2008 Jul 24;454(7203):486-91. doi: 10.1038/nature07101. Epub 2008 Jun 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 0QH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18594507" target="_blank"〉PubMed〈/a〉
    Keywords: Adrenergic beta-1 Receptor Agonists ; Adrenergic beta-1 Receptor Antagonists ; Adrenergic beta-Antagonists/chemistry/metabolism ; Amino Acid Motifs ; Animals ; Binding Sites ; Crystallization ; Crystallography, X-Ray ; Ligands ; Models, Molecular ; Mutant Proteins/chemistry/genetics/metabolism ; Mutation ; Pindolol/analogs & derivatives/chemistry/metabolism ; Propanolamines/chemistry/metabolism ; Protein Conformation ; Receptors, Adrenergic, beta-1/*chemistry/metabolism ; Thermodynamics ; Turkeys
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  • 113
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    Nature Publishing Group (NPG)
    Publication Date: 2008-10-10
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2008 Oct 9;455(7214):707. doi: 10.1038/455707a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18843307" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biomedical Research/economics/*trends ; Genome, Protozoan/genetics ; Humans ; Malaria/economics/mortality/parasitology/*prevention & control ; Malaria Vaccines ; Plasmodium/drug effects/genetics/immunology
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  • 114
    Publication Date: 2008-02-15
    Description: Mathematical models predict that species interactions such as competition and predation can generate chaos. However, experimental demonstrations of chaos in ecology are scarce, and have been limited to simple laboratory systems with a short duration and artificial species combinations. Here, we present the first experimental demonstration of chaos in a long-term experiment with a complex food web. Our food web was isolated from the Baltic Sea, and consisted of bacteria, several phytoplankton species, herbivorous and predatory zooplankton species, and detritivores. The food web was cultured in a laboratory mesocosm, and sampled twice a week for more than 2,300 days. Despite constant external conditions, the species abundances showed striking fluctuations over several orders of magnitude. These fluctuations displayed a variety of different periodicities, which could be attributed to different species interactions in the food web. The population dynamics were characterized by positive Lyapunov exponents of similar magnitude for each species. Predictability was limited to a time horizon of 15-30 days, only slightly longer than the local weather forecast. Hence, our results demonstrate that species interactions in food webs can generate chaos. This implies that stability is not required for the persistence of complex food webs, and that the long-term prediction of species abundances can be fundamentally impossible.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Beninca, Elisa -- Huisman, Jef -- Heerkloss, Reinhard -- Johnk, Klaus D -- Branco, Pedro -- Van Nes, Egbert H -- Scheffer, Marten -- Ellner, Stephen P -- England -- Nature. 2008 Feb 14;451(7180):822-5. doi: 10.1038/nature06512.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Aquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Nieuwe Achtergracht 127, 1018 WS Amsterdam, The Netherlands.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18273017" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacteria/metabolism ; *Food Chain ; Models, Biological ; *Nonlinear Dynamics ; Oceans and Seas ; Plankton/*metabolism ; Population Dynamics ; Species Specificity ; Time Factors
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  • 115
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    Nature Publishing Group (NPG)
    Publication Date: 2008-12-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wassarman, Paul M -- England -- Nature. 2008 Dec 4;456(7222):586-7. doi: 10.1038/456586a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19052615" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Conserved Sequence ; Crystallography, X-Ray ; Egg Proteins/*chemistry/genetics/*metabolism ; Female ; Fertilization/physiology ; Male ; Membrane Glycoproteins/*chemistry/genetics/*metabolism ; Mice ; Ovum/*chemistry/*metabolism ; Protein Folding ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Receptors, Cell Surface/*chemistry/genetics/*metabolism ; Spermatozoa/metabolism
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  • 116
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    Nature Publishing Group (NPG)
    Publication Date: 2008-10-10
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2008 Oct 9;455(7214):707-8. doi: 10.1038/455707b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18843306" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biodiversity ; Conservation of Natural Resources/*methods ; *Ecosystem ; *Extinction, Biological ; Greenhouse Effect
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  • 117
    Publication Date: 2008-04-11
    Description: During development, sympathetic neurons extend axons along a myriad of distinct trajectories, often consisting of arteries, to innervate one of a large variety of distinct final target tissues. Whether or not subsets of neurons within complex sympathetic ganglia are predetermined to innervate select end-organs is unknown. Here we demonstrate in mouse embryos that the endothelin family member Edn3 (ref. 1), acting through the endothelin receptor EdnrA (refs 2, 3), directs extension of axons of a subset of sympathetic neurons from the superior cervical ganglion to a preferred intermediate target, the external carotid artery, which serves as the gateway to select targets, including the salivary glands. These findings establish a previously unknown mechanism of axonal pathfinding involving vascular-derived endothelins, and have broad implications for endothelins as general mediators of axonal growth and guidance in the developing nervous system. Moreover, they suggest a model in which newborn sympathetic neurons distinguish and choose between distinct vascular trajectories to innervate their appropriate end organs.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2713667/" 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/PMC2713667/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Makita, Takako -- Sucov, Henry M -- Gariepy, Cheryl E -- Yanagisawa, Masashi -- Ginty, David D -- R01 HL078891/HL/NHLBI NIH HHS/ -- R01 HL078891-01A1/HL/NHLBI NIH HHS/ -- R01 HL078891-02/HL/NHLBI NIH HHS/ -- R01 HL078891-03/HL/NHLBI NIH HHS/ -- R37 NS034814/NS/NINDS NIH HHS/ -- R37 NS034814-11/NS/NINDS NIH HHS/ -- R37 NS034814-11S1/NS/NINDS NIH HHS/ -- R37 NS034814-12/NS/NINDS NIH HHS/ -- R37 NS034814-13/NS/NINDS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2008 Apr 10;452(7188):759-63. doi: 10.1038/nature06859.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Solomon H. Snyder Department of Neuroscience, Howard Hughes Medical Institute, 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/18401410" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/*physiology ; Carotid Arteries/cytology/*metabolism ; Cues ; Embryo, Mammalian/blood supply/cytology ; Endothelin-3/metabolism ; Endothelins/*metabolism ; Mice ; Neurites/physiology ; Receptors, Endothelin/metabolism ; Salivary Glands/innervation ; *Signal Transduction ; Superior Cervical Ganglion/*cytology/metabolism
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  • 118
    Publication Date: 2008-05-10
    Description: We present a draft genome sequence of the platypus, Ornithorhynchus anatinus. This monotreme exhibits a fascinating combination of reptilian and mammalian characters. For example, platypuses have a coat of fur adapted to an aquatic lifestyle; platypus females lactate, yet lay eggs; and males are equipped with venom similar to that of reptiles. Analysis of the first monotreme genome aligned these features with genetic innovations. We find that reptile and platypus venom proteins have been co-opted independently from the same gene families; milk protein genes are conserved despite platypuses laying eggs; and immune gene family expansions are directly related to platypus biology. Expansions of protein, non-protein-coding RNA and microRNA families, as well as repeat elements, are identified. Sequencing of this genome now provides a valuable resource for deep mammalian comparative analyses, as well as for monotreme biology and conservation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2803040/" 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/PMC2803040/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warren, Wesley C -- Hillier, LaDeana W -- Marshall Graves, Jennifer A -- Birney, Ewan -- Ponting, Chris P -- Grutzner, Frank -- Belov, Katherine -- Miller, Webb -- Clarke, Laura -- Chinwalla, Asif T -- Yang, Shiaw-Pyng -- Heger, Andreas -- Locke, Devin P -- Miethke, Pat -- Waters, Paul D -- Veyrunes, Frederic -- Fulton, Lucinda -- Fulton, Bob -- Graves, Tina -- Wallis, John -- Puente, Xose S -- Lopez-Otin, Carlos -- Ordonez, Gonzalo R -- Eichler, Evan E -- Chen, Lin -- Cheng, Ze -- Deakin, Janine E -- Alsop, Amber -- Thompson, Katherine -- Kirby, Patrick -- Papenfuss, Anthony T -- Wakefield, Matthew J -- Olender, Tsviya -- Lancet, Doron -- Huttley, Gavin A -- Smit, Arian F A -- Pask, Andrew -- Temple-Smith, Peter -- Batzer, Mark A -- Walker, Jerilyn A -- Konkel, Miriam K -- Harris, Robert S -- Whittington, Camilla M -- Wong, Emily S W -- Gemmell, Neil J -- Buschiazzo, Emmanuel -- Vargas Jentzsch, Iris M -- Merkel, Angelika -- Schmitz, Juergen -- Zemann, Anja -- Churakov, Gennady -- Kriegs, Jan Ole -- Brosius, Juergen -- Murchison, Elizabeth P -- Sachidanandam, Ravi -- Smith, Carly -- Hannon, Gregory J -- Tsend-Ayush, Enkhjargal -- McMillan, Daniel -- Attenborough, Rosalind -- Rens, Willem -- Ferguson-Smith, Malcolm -- Lefevre, Christophe M -- Sharp, Julie A -- Nicholas, Kevin R -- Ray, David A -- Kube, Michael -- Reinhardt, Richard -- Pringle, Thomas H -- Taylor, James -- Jones, Russell C -- Nixon, Brett -- Dacheux, Jean-Louis -- Niwa, Hitoshi -- Sekita, Yoko -- Huang, Xiaoqiu -- Stark, Alexander -- Kheradpour, Pouya -- Kellis, Manolis -- Flicek, Paul -- Chen, Yuan -- Webber, Caleb -- Hardison, Ross -- Nelson, Joanne -- Hallsworth-Pepin, Kym -- Delehaunty, Kim -- Markovic, Chris -- Minx, Pat -- Feng, Yucheng -- Kremitzki, Colin -- Mitreva, Makedonka -- Glasscock, Jarret -- Wylie, Todd -- Wohldmann, Patricia -- Thiru, Prathapan -- Nhan, Michael N -- Pohl, Craig S -- Smith, Scott M -- Hou, Shunfeng -- Nefedov, Mikhail -- de Jong, Pieter J -- Renfree, Marilyn B -- Mardis, Elaine R -- Wilson, Richard K -- 062023/Wellcome Trust/United Kingdom -- HG002238/HG/NHGRI NIH HHS/ -- MC_U137761446/Medical Research Council/United Kingdom -- P01 CA013106/CA/NCI NIH HHS/ -- P01 CA013106-37/CA/NCI NIH HHS/ -- R01 GM59290/GM/NIGMS NIH HHS/ -- R01 HG002939/HG/NHGRI NIH HHS/ -- R01 HG004037/HG/NHGRI NIH HHS/ -- R01 HG004037-02/HG/NHGRI NIH HHS/ -- R01HG02385/HG/NHGRI NIH HHS/ -- Medical Research Council/United Kingdom -- England -- Nature. 2008 May 8;453(7192):175-83. doi: 10.1038/nature06936.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Genome Sequencing Center, Washington University School of Medicine, Campus Box 8501, 4444 Forest Park Avenue, St Louis, Missouri 63108, USA. wwarren@wustl.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18464734" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Composition ; Dentition ; *Evolution, Molecular ; Female ; Genome/*genetics ; Genomic Imprinting/genetics ; Humans ; Immunity/genetics ; Male ; Mammals/genetics ; MicroRNAs/genetics ; Milk Proteins/genetics ; Phylogeny ; Platypus/*genetics/immunology/physiology ; Receptors, Odorant/genetics ; Repetitive Sequences, Nucleic Acid/genetics ; Reptiles/genetics ; Sequence Analysis, DNA ; Spermatozoa/metabolism ; Venoms/genetics ; Zona Pellucida/metabolism
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 119
    Publication Date: 2008-04-04
    Description: Continuous turnover of epithelia is ensured by the extensive self-renewal capacity of tissue-specific stem cells. Similarly, epithelial tumour maintenance relies on cancer stem cells (CSCs), which co-opt stem cell properties. For most tumours, the cellular origin of these CSCs and regulatory pathways essential for sustaining stemness have not been identified. In murine skin, follicular morphogenesis is driven by bulge stem cells that specifically express CD34. Here we identify a population of cells in early epidermal tumours characterized by phenotypic and functional similarities to normal bulge skin stem cells. This population contains CSCs, which are the only cells with tumour initiation properties. Transplants derived from these CSCs preserve the hierarchical organization of the primary tumour. We describe beta-catenin signalling as being essential in sustaining the CSC phenotype. Ablation of the beta-catenin gene results in the loss of CSCs and complete tumour regression. In addition, we provide evidence for the involvement of increased beta-catenin signalling in malignant human squamous cell carcinomas. Because Wnt/beta-catenin signalling is not essential for normal epidermal homeostasis, such a mechanistic difference may thus be targeted to eliminate CSCs and consequently eradicate squamous cell carcinomas.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Malanchi, Ilaria -- Peinado, Hector -- Kassen, Deepika -- Hussenet, Thomas -- Metzger, Daniel -- Chambon, Pierre -- Huber, Marcel -- Hohl, Daniel -- Cano, Amparo -- Birchmeier, Walter -- Huelsken, Joerg -- England -- Nature. 2008 Apr 3;452(7187):650-3. doi: 10.1038/nature06835.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ecole Polytechnique Federale de Lausanne/ISREC (Swiss Institute for Experimental Cancer Research) and National Center of Competence in Research Molecular Oncology, Chemin des Boveresses 155, 1066 Epalinges, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18385740" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD34/metabolism ; Cell Line, Tumor ; *Cell Transformation, Neoplastic ; Cells, Cultured ; Epidermis/pathology ; Humans ; Mice ; Mice, Nude ; Neoplasm Transplantation ; Neoplastic Stem Cells/*metabolism/*pathology ; *Signal Transduction ; Skin Neoplasms/*pathology ; beta Catenin/*metabolism
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  • 120
    Publication Date: 2008-01-19
    Description: Brain mechanisms for communication must establish a correspondence between sensory and motor codes used to represent the signal. One idea is that this correspondence is established at the level of single neurons that are active when the individual performs a particular gesture or observes a similar gesture performed by another individual. Although neurons that display a precise auditory-vocal correspondence could facilitate vocal communication, they have yet to be identified. Here we report that a certain class of neurons in the swamp sparrow forebrain displays a precise auditory-vocal correspondence. We show that these neurons respond in a temporally precise fashion to auditory presentation of certain note sequences in this songbird's repertoire and to similar note sequences in other birds' songs. These neurons display nearly identical patterns of activity when the bird sings the same sequence, and disrupting auditory feedback does not alter this singing-related activity, indicating it is motor in nature. Furthermore, these neurons innervate striatal structures important for song learning, raising the possibility that singing-related activity in these cells is compared to auditory feedback to guide vocal learning.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Prather, J F -- Peters, S -- Nowicki, S -- Mooney, R -- R01 DC002524/DC/NIDCD NIH HHS/ -- England -- Nature. 2008 Jan 17;451(7176):305-10. doi: 10.1038/nature06492.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, Duke University Medical Center, North Carolina 27710, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18202651" target="_blank"〉PubMed〈/a〉
    Keywords: Acoustic Stimulation ; Action Potentials ; Animals ; Auditory Perception/*physiology ; Electrophysiology ; Finches/physiology ; High Vocal Center/*cytology/physiology ; Imitative Behavior/*physiology ; Learning/*physiology ; Male ; Neurons/*physiology ; Sparrows/*physiology ; Vocalization, Animal/*physiology
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  • 121
    Publication Date: 2008-06-27
    Description: Roughly 60% of the Earth's outer surface is composed of oceanic crust formed by volcanic processes at mid-ocean ridges. Although only a small fraction of this vast volcanic terrain has been visually surveyed or sampled, the available evidence suggests that explosive eruptions are rare on mid-ocean ridges, particularly at depths below the critical point for seawater (3,000 m). A pyroclastic deposit has never been observed on the sea floor below 3,000 m, presumably because the volatile content of mid-ocean-ridge basalts is generally too low to produce the gas fractions required for fragmenting a magma at such high hydrostatic pressure. We employed new deep submergence technologies during an International Polar Year expedition to the Gakkel ridge in the Arctic Basin at 85 degrees E, to acquire photographic and video images of 'zero-age' volcanic terrain on this remote, ice-covered ridge. Here we present images revealing that the axial valley at 4,000 m water depth is blanketed with unconsolidated pyroclastic deposits, including bubble wall fragments (limu o Pele), covering a large (〉10 km(2)) area. At least 13.5 wt% CO(2) is necessary to fragment magma at these depths, which is about tenfold the highest values previously measured in a mid-ocean-ridge basalt. These observations raise important questions about the accumulation and discharge of magmatic volatiles at ultraslow spreading rates on the Gakkel ridge and demonstrate that large-scale pyroclastic activity is possible along even the deepest portions of the global mid-ocean ridge volcanic system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sohn, Robert A -- Willis, Claire -- Humphris, Susan -- Shank, Timothy M -- Singh, Hanumant -- Edmonds, Henrietta N -- Kunz, Clayton -- Hedman, Ulf -- Helmke, Elisabeth -- Jakuba, Michael -- Liljebladh, Bengt -- Linder, Julia -- Murphy, Christopher -- Nakamura, Ko-Ichi -- Sato, Taichi -- Schlindwein, Vera -- Stranne, Christian -- Tausenfreund, Maria -- Upchurch, Lucia -- Winsor, Peter -- Jakobsson, Martin -- Soule, Adam -- England -- Nature. 2008 Jun 26;453(7199):1236-8. doi: 10.1038/nature07075.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA. rsohn@whoi.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18580949" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arctic Regions ; Geography ; Oceanography ; Oceans and Seas ; Porifera ; Seawater ; Volcanic Eruptions/*statistics & numerical data
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  • 122
    Publication Date: 2008-04-12
    Description: RNA interference (RNAi) is a mechanism by which double-stranded RNAs (dsRNAs) suppress specific transcripts in a sequence-dependent manner. dsRNAs are processed by Dicer to 21-24-nucleotide small interfering RNAs (siRNAs) and then incorporated into the argonaute (Ago) proteins. Gene regulation by endogenous siRNAs has been observed only in organisms possessing RNA-dependent RNA polymerase (RdRP). In mammals, where no RdRP activity has been found, biogenesis and function of endogenous siRNAs remain largely unknown. Here we show, using mouse oocytes, that endogenous siRNAs are derived from naturally occurring dsRNAs and have roles in the regulation of gene expression. By means of deep sequencing, we identify a large number of both approximately 25-27-nucleotide Piwi-interacting RNAs (piRNAs) and approximately 21-nucleotide siRNAs corresponding to messenger RNAs or retrotransposons in growing oocytes. piRNAs are bound to Mili and have a role in the regulation of retrotransposons. siRNAs are exclusively mapped to retrotransposons or other genomic regions that produce transcripts capable of forming dsRNA structures. Inverted repeat structures, bidirectional transcription and antisense transcripts from various loci are sources of the dsRNAs. Some precursor transcripts of siRNAs are derived from expressed pseudogenes, indicating that one role of pseudogenes is to adjust the level of the founding source mRNA through RNAi. Loss of Dicer or Ago2 results in decreased levels of siRNAs and increased levels of retrotransposon and protein-coding transcripts complementary to the siRNAs. Thus, the RNAi pathway regulates both protein-coding transcripts and retrotransposons in mouse oocytes. Our results reveal a role for endogenous siRNAs in mammalian oocytes and show that organisms lacking RdRP activity can produce functional endogenous siRNAs from naturally occurring dsRNAs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Watanabe, Toshiaki -- Totoki, Yasushi -- Toyoda, Atsushi -- Kaneda, Masahiro -- Kuramochi-Miyagawa, Satomi -- Obata, Yayoi -- Chiba, Hatsune -- Kohara, Yuji -- Kono, Tomohiro -- Nakano, Toru -- Surani, M Azim -- Sakaki, Yoshiyuki -- Sasaki, Hiroyuki -- England -- Nature. 2008 May 22;453(7194):539-43. doi: 10.1038/nature06908. Epub 2008 Apr 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Human Genetics, Department of Integrated Genetics, National Institute of Genetics, Research Organization of Information and Systems, Mishima 411-8540, Japan. toshwata@lab.nig.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18404146" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Argonaute Proteins ; Eukaryotic Initiation Factor-2/deficiency/genetics/metabolism ; Female ; Gene Expression Regulation, Developmental ; Gene Library ; Mice ; Mice, Inbred C57BL ; Molecular Sequence Data ; Oocytes/growth & development/*metabolism ; Polymerase Chain Reaction ; Pseudogenes/genetics ; *RNA Interference ; RNA, Double-Stranded/*genetics/*metabolism ; RNA, Messenger/*genetics/metabolism ; RNA, Small Interfering/*genetics/*metabolism ; Retroelements/genetics ; Ribonuclease III/deficiency/genetics/metabolism
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  • 123
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    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2008-08-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Someya, Takao -- England -- Nature. 2008 Aug 7;454(7205):703-4. doi: 10.1038/454703a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18685691" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biomimetic Materials ; Biomimetics/*instrumentation ; Electronics/*instrumentation ; *Eye ; Semiconductors ; Silicon/*chemistry
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  • 124
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    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2008-03-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jayaraman, K S -- England -- Nature. 2008 Mar 6;452(7183):7. doi: 10.1038/452007a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18322485" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biodiversity ; *Classification ; Entomology/*legislation & jurisprudence ; India ; Insects/*classification ; International Cooperation ; Museums
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  • 125
    Publication Date: 2008-07-25
    Description: The nuclear receptors known as PPARs and LXRs are lipid-activated transcription factors that have emerged as key regulators of lipid metabolism and inflammation. PPARs and LXRs are activated by non-esterified fatty acids and cholesterol metabolites, respectively, and both exert positive and negative control over the expression of a range of metabolic and inflammatory genes. The ability of these nuclear receptors to integrate metabolic and inflammatory signalling makes them attractive targets for intervention in human metabolic diseases, such as atherosclerosis and type 2 diabetes, as well as for the modulation of inflammation and immune responses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bensinger, Steven J -- Tontonoz, Peter -- HL30568/HL/NHLBI NIH HHS/ -- HL66088/HL/NHLBI NIH HHS/ -- RR021975/RR/NCRR NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2008 Jul 24;454(7203):470-7. doi: 10.1038/nature07202.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, 675 Charles E. Young Drive, Los Angeles, California 90049, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18650918" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cholesterol/metabolism ; DNA-Binding Proteins/*metabolism ; Humans ; Inflammation/immunology/*metabolism ; Macrophages/immunology/metabolism ; Metabolic Diseases/metabolism/pathology ; Orphan Nuclear Receptors ; Peroxisome Proliferator-Activated Receptors/*metabolism ; Receptors, Cytoplasmic and Nuclear/*metabolism
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  • 126
    Publication Date: 2008-08-16
    Description: For a wide variety of microbial pathogens, the outcome of the infection is indeterminate. In some individuals the microbe is cleared, but in others it establishes a chronic infection, and the factors that tip this balance are often unknown. In a widely used model of chronic viral infection, C57BL/6 mice clear the Armstrong strain of lymphocytic choriomeningitis virus (LCMV), but the clone 13 strain persists. Here we show that the Armstrong strain induces a profound lymphopenia at days 1-3 after infection, but the clone 13 strain does not. If we transiently augment lymphopenia by treating the clone-13-infected mice with the drug FTY720 at days 0-2 after infection, the mice successfully clear the infection by day 30. Clearance does not occur when CD4 T cells are absent at the time of treatment, indicating that the drug is not exerting direct antiviral effects. Notably, FTY720 treatment of an already established persistent infection also leads to viral clearance. In both models, FTY720 treatment preserves or augments LCMV-specific CD4 and CD8 T-cell responses, a result that is counter-intuitive because FTY720 is generally regarded as a new immunosuppressive agent. Because FTY720 targets host pathways that are completely evolutionarily conserved, our results may be translatable into new immunotherapies for the treatment of chronic microbial infections in humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Premenko-Lanier, Mary -- Moseley, Nelson B -- Pruett, Sarah T -- Romagnoli, Pablo A -- Altman, John D -- 5F32AI062002/AI/NIAID NIH HHS/ -- AI042373/AI/NIAID NIH HHS/ -- England -- Nature. 2008 Aug 14;454(7206):894-8. doi: 10.1038/nature07199.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Emory Vaccine Center and Department of Microbiology and Immunology, Yerkes National Primate Research Center and Emory University School of Medicine, 954 Gatewood Road, Atlanta, Georgia 30329, USA. mflanie@emory.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18704087" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Chronic Disease ; Fingolimod Hydrochloride ; Lymphocytic Choriomeningitis/complications/*drug therapy/*immunology/prevention & ; control ; Lymphocytic choriomeningitis virus/*immunology/physiology ; Lymphopenia/etiology ; Mice ; Mice, Inbred C57BL ; Propylene Glycols/administration & dosage/*pharmacology/*therapeutic use ; Sphingosine/administration & dosage/*analogs & ; derivatives/pharmacology/therapeutic use ; T-Lymphocytes/drug effects/immunology ; Time Factors
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  • 127
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    Nature Publishing Group (NPG)
    Publication Date: 2008-04-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Goffeau, Andre -- England -- Nature. 2008 Apr 3;452(7187):541-2. doi: 10.1038/452541a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18385723" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antifungal Agents/metabolism/pharmacology ; Candida glabrata/drug effects/genetics/*metabolism ; DNA-Binding Proteins/chemistry/genetics/metabolism ; *Drug Resistance, Fungal/genetics ; Fungal Proteins/chemistry/genetics/*metabolism ; *Gene Expression Regulation, Fungal/genetics ; Humans ; Receptors, Steroid/*metabolism ; Saccharomyces cerevisiae/drug effects/genetics/*metabolism ; Saccharomyces cerevisiae Proteins/chemistry/genetics/metabolism ; Trans-Activators/chemistry/genetics/metabolism ; Transcription Factors/genetics/metabolism ; Xenobiotics/metabolism/pharmacology
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  • 128
    Publication Date: 2008-06-27
    Description: In groundbreaking experiments, Hans Spemann demonstrated that the dorsal part of the amphibian embryo can generate a well-proportioned tadpole, and that a small group of dorsal cells, the 'organizer', can induce a complete and well-proportioned twinned axis when transplanted into a host embryo. Key to organizer function is the localized secretion of inhibitors of bone morphogenetic protein (BMP), which defines a graded BMP activation profile. Although the central proteins involved in shaping this gradient are well characterized, their integrated function, and in particular how pattern scales with size, is not understood. Here we present evidence that in Xenopus, the BMP activity gradient is defined by a 'shuttling-based' mechanism, whereby the BMP ligands are translocated ventrally through their association with the BMP inhibitor Chordin. This shuttling, with feedback repression of the BMP ligand Admp, offers a quantitative explanation to Spemann's observations, and accounts naturally for the scaling of embryo pattern with its size.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ben-Zvi, Danny -- Shilo, Ben-Zion -- Fainsod, Abraham -- Barkai, Naama -- England -- Nature. 2008 Jun 26;453(7199):1205-11. doi: 10.1038/nature07059.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18580943" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Body Patterning ; Body Size ; Bone Morphogenetic Protein 4 ; Bone Morphogenetic Proteins/antagonists & inhibitors/*metabolism ; Embryo, Nonmammalian/embryology/*metabolism ; Glycoproteins/metabolism ; Intercellular Signaling Peptides and Proteins/metabolism ; Ligands ; Models, Biological ; Protein Transport ; Xenopus/*embryology/genetics/metabolism ; Xenopus Proteins/metabolism
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  • 129
    Publication Date: 2008-11-21
    Description: The simplest animal eyes are eyespots composed of two cells only: a photoreceptor and a shading pigment cell. They resemble Darwin's 'proto-eyes', considered to be the first eyes to appear in animal evolution. Eyespots cannot form images but enable the animal to sense the direction of light. They are characteristic for the zooplankton larvae of marine invertebrates and are thought to mediate larval swimming towards the light. Phototaxis of invertebrate larvae contributes to the vertical migration of marine plankton, which is thought to represent the biggest biomass transport on Earth. Yet, despite its ecological and evolutionary importance, the mechanism by which eyespots regulate phototaxis is poorly understood. Here we show how simple eyespots in marine zooplankton mediate phototactic swimming, using the marine annelid Platynereis dumerilii as a model. We find that the selective illumination of one eyespot changes the beating of adjacent cilia by direct cholinergic innervation resulting in locally reduced water flow. Computer simulations of larval swimming show that these local effects are sufficient to direct the helical swimming trajectories towards the light. The computer model also shows that axial rotation of the larval body is essential for phototaxis and that helical swimming increases the precision of navigation. These results provide, to our knowledge, the first mechanistic understanding of phototaxis in a marine zooplankton larva and show how simple eyespots regulate it. We propose that the underlying direct coupling of light sensing and ciliary locomotor control was a principal feature of the proto-eye and an important landmark in the evolution of animal eyes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jekely, Gaspar -- Colombelli, Julien -- Hausen, Harald -- Guy, Keren -- Stelzer, Ernst -- Nedelec, Francois -- Arendt, Detlev -- England -- Nature. 2008 Nov 20;456(7220):395-9. doi: 10.1038/nature07590.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Developmental Biology Unit, European Molecular Biology Laboratory, Heidelberg 69117, Germany. gaspar.jekely@tuebingen.mpg.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19020621" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Annelida/cytology/growth & development/*physiology/*radiation effects ; Cilia/physiology/radiation effects ; Computer Simulation ; Eye/cytology/radiation effects ; Larva/cytology/physiology/radiation effects ; *Light ; Locomotion/*radiation effects ; Photoreceptor Cells, Invertebrate/physiology/radiation effects ; Receptors, Nicotinic/metabolism ; Swimming/physiology ; Vision, Ocular/*physiology/*radiation effects ; Zooplankton/cytology/growth & development/*physiology/*radiation effects
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  • 130
    Publication Date: 2008-08-15
    Description: Human cytomegalovirus (HCMV) is a ubiquitous human herpesvirus that can cause life-threatening disease in the fetus and the immunocompromised host. Upon attachment to the cell, the virus induces robust inflammatory, interferon- and growth-factor-like signalling. The mechanisms facilitating viral entry and gene expression are not clearly understood. Here we show that platelet-derived growth factor-alpha receptor (PDGFR-alpha) is specifically phosphorylated by both laboratory and clinical isolates of HCMV in various human cell types, resulting in activation of the phosphoinositide-3-kinase (PI(3)K) signalling pathway. Upon stimulation by HCMV, tyrosine-phosphorylated PDGFR-alpha associated with the p85 regulatory subunit of PI(3)K and induced protein kinase B (also known as Akt) phosphorylation, similar to the genuine ligand, PDGF-AA. Cells in which PDGFR-alpha was genetically deleted or functionally blocked were non-permissive to HCMV entry, viral gene expression or infectious virus production. Re-introducing human PDGFRA gene into knockout cells restored susceptibility to viral entry and essential viral gene expression. Blockade of receptor function with a humanized PDGFR-alpha blocking antibody (IMC-3G3) or targeted inhibition of its kinase activity with a small molecule (Gleevec) completely inhibited HCMV viral internalization and gene expression in human epithelial, endothelial and fibroblast cells. Viral entry in cells harbouring endogenous PDGFR-alpha was competitively inhibited by pretreatment with PDGF-AA. We further demonstrate that HCMV glycoprotein B directly interacts with PDGFR-alpha, resulting in receptor tyrosine phosphorylation, and that glycoprotein B neutralizing antibodies inhibit HCMV-induced PDGFR-alpha phosphorylation. Taken together, these data indicate that PDGFR-alpha is a critical receptor required for HCMV infection, and thus a target for novel anti-viral therapies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Soroceanu, Liliana -- Akhavan, Armin -- Cobbs, Charles S -- England -- Nature. 2008 Sep 18;455(7211):391-5. doi: 10.1038/nature07209. Epub 2008 Aug 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurosciences, California Pacific Medical Center Research Institute, Suite 220, 475 Brannan Street, San Francisco, California 94107, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18701889" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Cytomegalovirus/*physiology ; Cytomegalovirus Infections/*metabolism/*virology ; Enzyme Activation/drug effects ; Gene Expression Regulation, Viral ; Humans ; Mice ; Phosphatidylinositol 3-Kinases/metabolism ; Phosphorylation ; Phosphotyrosine/metabolism ; Platelet-Derived Growth Factor/metabolism/pharmacology ; Protein Binding/drug effects ; Proto-Oncogene Proteins c-akt/metabolism ; Receptor, Platelet-Derived Growth Factor alpha/deficiency/genetics/*metabolism ; Signal Transduction ; Viral Envelope Proteins/metabolism ; Virus Internalization
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  • 131
    Publication Date: 2008-08-22
    Description: Nuclear exclusion of the PTEN (phosphatase and tensin homologue deleted in chromosome 10) tumour suppressor has been associated with cancer progression. However, the mechanisms leading to this aberrant PTEN localization in human cancers are currently unknown. We have previously reported that ubiquitinylation of PTEN at specific lysine residues regulates its nuclear-cytoplasmic partitioning. Here we show that functional promyelocytic leukaemia protein (PML) nuclear bodies co-ordinate PTEN localization by opposing the action of a previously unknown PTEN-deubiquitinylating enzyme, herpesvirus-associated ubiquitin-specific protease (HAUSP, also known as USP7), and that the integrity of this molecular framework is required for PTEN to be able to enter the nucleus. We find that PTEN is aberrantly localized in acute promyelocytic leukaemia, in which PML function is disrupted by the PML-RARalpha fusion oncoprotein. Remarkably, treatment with drugs that trigger PML-RARalpha degradation, such as all-trans retinoic acid or arsenic trioxide, restore nuclear PTEN. We demonstrate that PML opposes the activity of HAUSP towards PTEN through a mechanism involving the adaptor protein DAXX (death domain-associated protein). In support of this paradigm, we show that HAUSP is overexpressed in human prostate cancer and is associated with PTEN nuclear exclusion. Thus, our results delineate a previously unknown PML-DAXX-HAUSP molecular network controlling PTEN deubiquitinylation and trafficking, which is perturbed by oncogenic cues in human cancer, in turn defining a new deubiquitinylation-dependent model for PTEN subcellular compartmentalization.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3398484/" 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/PMC3398484/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Song, Min Sup -- Salmena, Leonardo -- Carracedo, Arkaitz -- Egia, Ainara -- Lo-Coco, Francesco -- Teruya-Feldstein, Julie -- Pandolfi, Pier Paolo -- P50 CA092629/CA/NCI NIH HHS/ -- P50 CA092629-01/CA/NCI NIH HHS/ -- R01 CA082328/CA/NCI NIH HHS/ -- England -- Nature. 2008 Oct 9;455(7214):813-7. doi: 10.1038/nature07290. Epub 2008 Aug 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cancer Genetics Program, Beth Israel Deaconess Cancer Center and Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18716620" target="_blank"〉PubMed〈/a〉
    Keywords: Active Transport, Cell Nucleus ; Adaptor Proteins, Signal Transducing/metabolism ; Animals ; Apoptosis ; Cell Line, Tumor ; Cell Nucleus/metabolism ; Fibroblasts ; Humans ; Leukemia, Promyelocytic, Acute/metabolism/pathology ; Male ; Mice ; Nuclear Proteins/deficiency/genetics/*metabolism ; PTEN Phosphohydrolase/*metabolism ; Prostatic Neoplasms/metabolism/pathology ; Transcription Factors/deficiency/genetics/*metabolism ; Tretinoin/pharmacology ; Tumor Suppressor Proteins/deficiency/genetics/*metabolism ; Ubiquitin Thiolesterase/*metabolism ; *Ubiquitination ; Ubiquitins/*metabolism
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  • 132
    Publication Date: 2008-03-04
    Description: Microsporidia are highly specialized obligate intracellular parasites of other eukaryotes (including humans) that show extreme reduction at the molecular, cellular and biochemical level. Although microsporidia have long been considered as early branching eukaryotes that lack mitochondria, they have recently been shown to contain a tiny mitochondrial remnant called a mitosome. The function of the mitosome is unknown, because microsporidians lack the genes for canonical mitochondrial functions, such as aerobic respiration and haem biosynthesis. However, microsporidial genomes encode several components of the mitochondrial iron-sulphur (Fe-S) cluster assembly machinery. Here we provide experimental insights into the metabolic function and localization of these proteins. We cloned, functionally characterized and localized homologues of several central mitochondrial Fe-S cluster assembly components for the microsporidians Encephalitozoon cuniculi and Trachipleistophora hominis. Several microsporidial proteins can functionally replace their yeast counterparts in Fe-S protein biogenesis. In E. cuniculi, the iron (frataxin) and sulphur (cysteine desulphurase, Nfs1) donors and the scaffold protein (Isu1) co-localize with mitochondrial Hsp70 to the mitosome, consistent with it being the functional site for Fe-S cluster biosynthesis. In T. hominis, mitochondrial Hsp70 and the essential sulphur donor (Nfs1) are still in the mitosome, but surprisingly the main pools of Isu1 and frataxin are cytosolic, creating a conundrum of how these key components of Fe-S cluster biosynthesis coordinate their function. Together, our studies identify the essential biosynthetic process of Fe-S protein assembly as a key function of microsporidian mitosomes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Goldberg, Alina V -- Molik, Sabine -- Tsaousis, Anastasios D -- Neumann, Karina -- Kuhnke, Grit -- Delbac, Frederic -- Vivares, Christian P -- Hirt, Robert P -- Lill, Roland -- Embley, T Martin -- England -- Nature. 2008 Apr 3;452(7187):624-8. doi: 10.1038/nature06606. Epub 2008 Mar 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Cell and Molecular Biosciences, The Catherine Cookson Building, Newcastle University, Newcastle upon Tyne NE2 4HH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18311129" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Cloning, Molecular ; Fungal Proteins/genetics/*metabolism ; HSP70 Heat-Shock Proteins/genetics/metabolism ; Iron-Binding Proteins/genetics/metabolism ; Iron-Sulfur Proteins/*biosynthesis/genetics/metabolism ; Microsporidia/cytology/genetics/*metabolism ; Mitochondria/metabolism ; Molecular Sequence Data ; Protein Transport ; Rabbits ; Saccharomyces cerevisiae/cytology/genetics/metabolism
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  • 133
    Publication Date: 2008-07-03
    Description: On activation by receptors, the ubiquitously expressed class IA isoforms (p110alpha and p110beta) of phosphatidylinositol-3-OH kinase (PI(3)K) generate lipid second messengers, which initiate multiple signal transduction cascades. Recent studies have demonstrated specific functions for p110alpha in growth factor and insulin signalling. To probe for distinct functions of p110beta, we constructed conditional knockout mice. Here we show that ablation of p110beta in the livers of the resulting mice leads to impaired insulin sensitivity and glucose homeostasis, while having little effect on phosphorylation of Akt, suggesting the involvement of a kinase-independent role of p110beta in insulin metabolic action. Using established mouse embryonic fibroblasts, we found that removal of p110beta also had little effect on Akt phosphorylation in response to stimulation by insulin and epidermal growth factor, but resulted in retarded cell proliferation. Reconstitution of p110beta-null cells with a wild-type or kinase-dead allele of p110beta demonstrated that p110beta possesses kinase-independent functions in regulating cell proliferation and trafficking. However, the kinase activity of p110beta was required for G-protein-coupled receptor signalling triggered by lysophosphatidic acid and had a function in oncogenic transformation. Most strikingly, in an animal model of prostate tumour formation induced by Pten loss, ablation of p110beta (also known as Pik3cb), but not that of p110alpha (also known as Pik3ca), impeded tumorigenesis with a concomitant diminution of Akt phosphorylation. Taken together, our findings demonstrate both kinase-dependent and kinase-independent functions for p110beta, and strongly indicate the kinase-dependent functions of p110beta as a promising target in cancer therapy.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2750091/" 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/PMC2750091/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jia, Shidong -- Liu, Zhenning -- Zhang, Sen -- Liu, Pixu -- Zhang, Lei -- Lee, Sang Hyun -- Zhang, Jing -- Signoretti, Sabina -- Loda, Massimo -- Roberts, Thomas M -- Zhao, Jean J -- P01 CA050661/CA/NCI NIH HHS/ -- P01 CA050661-200001/CA/NCI NIH HHS/ -- P01 CA089021/CA/NCI NIH HHS/ -- P01 CA089021-06A1/CA/NCI NIH HHS/ -- P50 CA089393/CA/NCI NIH HHS/ -- P50 CA089393-08S1/CA/NCI NIH HHS/ -- P50 CA090381/CA/NCI NIH HHS/ -- P50 CA090381-05/CA/NCI NIH HHS/ -- R01 CA030002/CA/NCI NIH HHS/ -- R01 CA030002-27/CA/NCI NIH HHS/ -- R01 CA134502/CA/NCI NIH HHS/ -- R01 CA134502-01/CA/NCI NIH HHS/ -- England -- Nature. 2008 Aug 7;454(7205):776-9. doi: 10.1038/nature07091. Epub 2008 Jun 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18594509" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell Proliferation/drug effects ; *Cell Transformation, Neoplastic ; Epidermal Growth Factor/pharmacology ; Fibroblasts/cytology ; Glucose/*metabolism ; Glucose Intolerance/enzymology/genetics ; Homeostasis ; Humans ; Insulin/*metabolism/pharmacology ; Insulin Resistance/genetics ; Liver/enzymology/metabolism ; Male ; Mice ; Mice, Inbred C57BL ; PTEN Phosphohydrolase/deficiency/genetics ; Phosphatidylinositol 3-Kinases/deficiency/genetics/*metabolism ; Phosphorylation/drug effects ; Prostatic Neoplasms/enzymology/genetics/pathology ; Proto-Oncogene Proteins c-akt/metabolism ; Signal Transduction
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  • 134
    Publication Date: 2008-08-22
    Description: Myc is a pleiotropic basic helix-loop-helix leucine zipper transcription factor that coordinates expression of the diverse intracellular and extracellular programs that together are necessary for growth and expansion of somatic cells. In principle, this makes inhibition of Myc an attractive pharmacological approach for treating diverse types of cancer. However, enthusiasm has been muted by lack of direct evidence that Myc inhibition would be therapeutically efficacious, concerns that it would induce serious side effects by inhibiting proliferation of normal tissues, and practical difficulties in designing Myc inhibitory drugs. We have modelled genetically both the therapeutic impact and the side effects of systemic Myc inhibition in a preclinical mouse model of Ras-induced lung adenocarcinoma by reversible, systemic expression of a dominant-interfering Myc mutant. We show that Myc inhibition triggers rapid regression of incipient and established lung tumours, defining an unexpected role for endogenous Myc function in the maintenance of Ras-dependent tumours in vivo. Systemic Myc inhibition also exerts profound effects on normal regenerating tissues. However, these effects are well tolerated over extended periods and rapidly and completely reversible. Our data demonstrate the feasibility of targeting Myc, a common downstream conduit for many oncogenic signals, as an effective, efficient and tumour-specific cancer therapy.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4485609/" 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/PMC4485609/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Soucek, Laura -- Whitfield, Jonathan -- Martins, Carla P -- Finch, Andrew J -- Murphy, Daniel J -- Sodir, Nicole M -- Karnezis, Anthony N -- Swigart, Lamorna Brown -- Nasi, Sergio -- Evan, Gerard I -- 2R01 CA98018/CA/NCI NIH HHS/ -- R01 CA098018/CA/NCI NIH HHS/ -- R01 CA098018-05/CA/NCI NIH HHS/ -- R01 CA098018-06/CA/NCI NIH HHS/ -- R01 CA098018-07/CA/NCI NIH HHS/ -- T32 CA108462/CA/NCI NIH HHS/ -- T32 CA108462-01/CA/NCI NIH HHS/ -- England -- Nature. 2008 Oct 2;455(7213):679-83. doi: 10.1038/nature07260. Epub 2008 Aug 17.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology and Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, California 94143-0875, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18716624" target="_blank"〉PubMed〈/a〉
    Keywords: Adenocarcinoma/genetics/metabolism/pathology/therapy ; Animals ; Gastrointestinal Tract/cytology/metabolism/pathology ; Genes, Dominant/genetics ; Genes, ras ; *Genetic Therapy ; Lung Neoplasms/genetics/metabolism/pathology/*therapy ; Male ; Mice ; *Models, Biological ; Mutation/genetics ; Oncogene Protein p21(ras)/metabolism ; Proto-Oncogene Proteins c-myc/*antagonists & inhibitors/*genetics/metabolism ; Skin/cytology/metabolism/pathology ; Testis/cytology/metabolism/pathology ; Transgenes/genetics
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  • 135
    Publication Date: 2008-03-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Prichard, Roger K -- Geary, Timothy G -- England -- Nature. 2008 Mar 13;452(7184):157-8. doi: 10.1038/452157a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18337806" target="_blank"〉PubMed〈/a〉
    Keywords: Aminoacetonitrile/*analogs & derivatives/*pharmacology/therapeutic use ; Animals ; Anthelmintics/*pharmacology/therapeutic use ; *Drug Resistance ; Goats/parasitology ; Larva/parasitology ; Parasites/*drug effects/physiology ; Parasitic Diseases, Animal/drug therapy/*parasitology ; Sheep/parasitology ; Substrate Specificity
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  • 136
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    Nature Publishing Group (NPG)
    Publication Date: 2008-01-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weinberger, Sharon -- England -- Nature. 2008 Jan 24;451(7177):390-3. doi: 10.1038/451390a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18216826" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bionics/trends ; History, 20th Century ; History, 21st Century ; Humans ; Internet ; Research/history/*trends ; Robotics/trends ; Security Measures/history/organization & administration/*trends ; Technology/history/*trends ; Terrorism/prevention & control ; United States ; United States Government Agencies/economics/history/organization & ; administration/*trends
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  • 137
    Publication Date: 2008-03-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Prolo, Laura M -- Goodman, Miriam B -- England -- Nature. 2008 Mar 6;452(7183):35-6. doi: 10.1038/452035a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18322516" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Clocks/physiology ; Caenorhabditis elegans/*physiology ; Caenorhabditis elegans Proteins/genetics/metabolism ; Calcium/metabolism ; Defecation/*physiology ; Gastrointestinal Motility/*physiology ; Humans ; Hydrogen-Ion Concentration ; Intestines/cytology/physiology ; Muscle Contraction/physiology ; Muscles/cytology/metabolism/physiology ; *Protons ; Sodium-Hydrogen Antiporter/genetics/metabolism
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  • 138
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    Publication Date: 2008-09-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bernards, Rene -- England -- Nature. 2008 Sep 25;455(7212):479-80. doi: 10.1038/455479a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18818647" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Colorectal Neoplasms/genetics/*metabolism/pathology ; Cyclin-Dependent Kinase 8 ; Cyclin-Dependent Kinases/*metabolism ; Drosophila/genetics/metabolism ; E2F1 Transcription Factor/*metabolism ; Gene Expression Regulation, Neoplastic ; Humans ; Mice ; Retinoblastoma Protein/*metabolism ; Signal Transduction ; Wnt Proteins/metabolism ; beta Catenin/*metabolism
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  • 139
    Publication Date: 2008-09-17
    Description: The oral cavity of vertebrates is generally thought to arise as an ectodermal invagination. Consistent with this, oral teeth are proposed to arise exclusively from ectoderm, contributing to tooth enamel epithelium, and from neural crest derived mesenchyme, contributing to dentin and pulp. Yet in many vertebrate groups, teeth are not restricted only to the oral cavity, but extend posteriorly as pharyngeal teeth that could be derived either directly from the endodermal epithelium, or from the ectodermal epithelium that reached this location through the mouth or through the pharyngeal slits. However, when the oropharyngeal membrane, which forms a sharp ecto/endodermal border, is broken, the fate of these cells is poorly known. Here, using transgenic axolotls with a combination of fate-mapping approaches, we present reliable evidence of oral teeth derived from both the ectoderm and endoderm and, moreover, demonstrate teeth with a mixed ecto/endodermal origin. Despite the enamel epithelia having a different embryonic source, oral teeth in the axolotl display striking developmental uniformities and are otherwise identical. This suggests a dominant role for the neural crest mesenchyme over epithelia in tooth initiation and, from an evolutionary point of view, that an essential factor in teeth evolution was the odontogenic capacity of neural crest cells, regardless of possible 'outside-in' or 'inside-out' influx of the epithelium.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Soukup, Vladimir -- Epperlein, Hans-Henning -- Horacek, Ivan -- Cerny, Robert -- England -- Nature. 2008 Oct 9;455(7214):795-8. doi: 10.1038/nature07304. Epub 2008 Sep 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoology, Charles University in Prague, Vinicna 7, 128 44 Prague, Czech Republic.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18794902" target="_blank"〉PubMed〈/a〉
    Keywords: Ambystoma mexicanum/*embryology ; Animals ; Animals, Genetically Modified ; Ectoderm/*cytology/embryology ; Endoderm/*cytology/embryology ; Epithelium/*embryology ; Morphogenesis ; Tooth/*cytology/*embryology
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  • 140
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    Nature Publishing Group (NPG)
    Publication Date: 2008-09-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2008 Sep 25;455(7212):431-2. doi: 10.1038/455431b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18818597" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Biology/*education/standards ; Empirical Research ; Great Britain ; Humans ; Newspapers as Topic ; *Religion and Science ; Societies, Scientific/*organization & administration
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  • 141
    Publication Date: 2008-10-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weinshenker, David -- Warren, Stephen T -- England -- Nature. 2008 Oct 2;455(7213):607-8. doi: 10.1038/455607a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18833269" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Dopamine/*metabolism ; Fragile X Mental Retardation Protein/genetics/*metabolism ; Fragile X Syndrome/genetics/*metabolism/physiopathology ; G-Protein-Coupled Receptor Kinase 2/metabolism ; Gene Deletion ; Humans ; Mice ; Signal Transduction
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  • 142
    Publication Date: 2008-12-17
    Description: Giardia lamblia (also called Giardia intestinalis) is one of the most common intestinal parasites of humans. To evade the host's immune response, Giardia undergoes antigenic variation-a process that allows the parasite to develop chronic and recurrent infections. From a repertoire of approximately 190 variant-specific surface protein (VSP)-coding genes, Giardia expresses only one VSP on the surface of each parasite at a particular time, but spontaneously switches to a different VSP by unknown mechanisms. Here we show that regulation of VSP expression involves a system comprising RNA-dependent RNA polymerase, Dicer and Argonaute, known components of the RNA interference machinery. Clones expressing a single surface antigen efficiently transcribe several VSP genes but only accumulate transcripts encoding the VSP to be expressed. Detection of antisense RNAs corresponding to the silenced VSP genes and small RNAs from the silenced but not for the expressed vsp implicate the RNA interference pathway in antigenic variation. Remarkably, silencing of Dicer and RNA-dependent RNA polymerase leads to a change from single to multiple VSP expression in individual parasites.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Prucca, Cesar G -- Slavin, Ileana -- Quiroga, Rodrigo -- Elias, Eliana V -- Rivero, Fernando D -- Saura, Alicia -- Carranza, Pedro G -- Lujan, Hugo D -- Howard Hughes Medical Institute/ -- England -- Nature. 2008 Dec 11;456(7223):750-4. doi: 10.1038/nature07585.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratorio de Bioquimica y Biologia Molecular, Facultad de Medicina, Universidad Catolica de Cordoba, Cordoba X5004ASK, Argentina.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19079052" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Genetically Modified ; Antigenic Variation/*genetics/immunology ; Antigens, Protozoan/*genetics/immunology ; Antigens, Surface/*genetics/immunology ; *Gene Expression Regulation ; Gene Knockdown Techniques ; Giardia lamblia/*genetics/immunology ; Molecular Sequence Data ; Protozoan Proteins/genetics/immunology ; *RNA Interference ; RNA, Protozoan/metabolism ; Ribonuclease III/metabolism
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  • 143
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    Nature Publishing Group (NPG)
    Publication Date: 2008-06-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Berry, Andrew -- Browne, Janet -- England -- Nature. 2008 Jun 26;453(7199):1188-90. doi: 10.1038/4531188a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Harvard University, Biology Laboratories, 16 Divinity Avenue, Cambridge, Massachusetts 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18580934" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; History, 19th Century ; History, 20th Century ; Selection, Genetic
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  • 144
    Publication Date: 2008-02-19
    Description: MicroRNAs are abundant in animal genomes and have been predicted to have important roles in a broad range of gene expression programmes. Despite this prominence, there is a dearth of functional knowledge regarding individual mammalian microRNAs. Using a loss-of-function allele in mice, we report here that the myeloid-specific microRNA-223 (miR-223) negatively regulates progenitor proliferation and granulocyte differentiation and activation. miR-223 (also called Mirn223) mutant mice have an expanded granulocytic compartment resulting from a cell-autonomous increase in the number of granulocyte progenitors. We show that Mef2c, a transcription factor that promotes myeloid progenitor proliferation, is a target of miR-223, and that genetic ablation of Mef2c suppresses progenitor expansion and corrects the neutrophilic phenotype in miR-223 null mice. In addition, granulocytes lacking miR-223 are hypermature, hypersensitive to activating stimuli and display increased fungicidal activity. As a consequence of this neutrophil hyperactivity, miR-223 mutant mice spontaneously develop inflammatory lung pathology and exhibit exaggerated tissue destruction after endotoxin challenge. Our data support a model in which miR-223 acts as a fine-tuner of granulocyte production and the inflammatory response.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Johnnidis, Jonathan B -- Harris, Marian H -- Wheeler, Robert T -- Stehling-Sun, Sandra -- Lam, Michael H -- Kirak, Oktay -- Brummelkamp, Thijn R -- Fleming, Mark D -- Camargo, Fernando D -- England -- Nature. 2008 Feb 28;451(7182):1125-9. doi: 10.1038/nature06607. Epub 2008 Feb 17.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18278031" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Cell Differentiation ; *Cell Proliferation ; Gene Deletion ; Granulocytes/*cytology/immunology/pathology/*physiology ; Inflammation/genetics/immunology/pathology ; Lung/pathology ; MEF2 Transcription Factors ; Mice ; Mice, Knockout ; MicroRNAs/*genetics/*metabolism ; Myogenic Regulatory Factors/genetics/metabolism ; Neutrophils/physiology ; Phenotype ; Stem Cells/*cytology
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  • 145
    Publication Date: 2008-05-02
    Description: Half a century ago, the apical ectodermal ridge (AER) at the distal tip of the tetrapod limb bud was shown to produce signals necessary for development along the proximal-distal (P-D) axis, but how these signals influence limb patterning is still much debated. Fibroblast growth factor (FGF) gene family members are key AER-derived signals, with Fgf4, Fgf8, Fgf9 and Fgf17 expressed specifically in the mouse AER. Here we demonstrate that mouse limbs lacking Fgf4, Fgf9 and Fgf17 have normal skeletal pattern, indicating that Fgf8 is sufficient among AER-FGFs to sustain normal limb formation. Inactivation of Fgf8 alone causes a mild skeletal phenotype; however, when we also removed different combinations of the other AER-FGF genes, we obtained unexpected skeletal phenotypes of increasing severity, reflecting the contribution that each FGF can make to the total AER-FGF signal. Analysis of the compound mutant limb buds revealed that, in addition to sustaining cell survival, AER-FGFs regulate P-D-patterning gene expression during early limb bud development, providing genetic evidence that AER-FGFs function to specify a distal domain and challenging the long-standing hypothesis that AER-FGF signalling is permissive rather than instructive for limb patterning. We discuss how a two-signal model for P-D patterning can be integrated with the concept of early specification to explain the genetic data presented here.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2631409/" 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/PMC2631409/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mariani, Francesca V -- Ahn, Christina P -- Martin, Gail R -- F32 HD008696/HD/NICHD NIH HHS/ -- F32 HD008696-01/HD/NICHD NIH HHS/ -- F32 HD008696-02/HD/NICHD NIH HHS/ -- F32 HD008696-03/HD/NICHD NIH HHS/ -- R01 HD034380/HD/NICHD NIH HHS/ -- R01 HD034380-05/HD/NICHD NIH HHS/ -- R01 HD034380-06/HD/NICHD NIH HHS/ -- R01 HD034380-07/HD/NICHD NIH HHS/ -- R01 HD034380-08/HD/NICHD NIH HHS/ -- R01 HD034380-09/HD/NICHD NIH HHS/ -- R01 HD34380/HD/NICHD NIH HHS/ -- England -- Nature. 2008 May 15;453(7193):401-5. doi: 10.1038/nature06876. Epub 2008 Apr 30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Anatomy and Program in Developmental Biology, School of Medicine, University of California at San Francisco, San Francisco, California 94158-2324, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18449196" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Body Patterning/*genetics/*physiology ; Bone and Bones/embryology/metabolism ; Cell Survival ; Female ; Fibroblast Growth Factor 8/deficiency/genetics/*metabolism ; Fibroblast Growth Factors/deficiency/genetics/*metabolism ; Homeodomain Proteins/genetics ; Limb Buds/cytology/*embryology/metabolism ; Male ; Mice ; Neoplasm Proteins/genetics ; Organ Size ; Signal Transduction
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  • 146
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    Nature Publishing Group (NPG)
    Publication Date: 2008-02-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Speakman, John -- England -- Nature. 2008 Feb 14;451(7180):774-5. doi: 10.1038/451774a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18270540" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Chiroptera/anatomy & histology/*physiology ; Cochlea/anatomy & histology/physiology ; Darkness ; Echolocation/*physiology ; Extremities/anatomy & histology/physiology ; Flight, Animal/*physiology ; Fossils ; Models, Biological ; Time Factors ; Wyoming
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  • 147
    Publication Date: 2008-09-23
    Description: Type 1 diabetes (T1D) is a debilitating autoimmune disease that results from T-cell-mediated destruction of insulin-producing beta-cells. Its incidence has increased during the past several decades in developed countries, suggesting that changes in the environment (including the human microbial environment) may influence disease pathogenesis. The incidence of spontaneous T1D in non-obese diabetic (NOD) mice can be affected by the microbial environment in the animal housing facility or by exposure to microbial stimuli, such as injection with mycobacteria or various microbial products. Here we show that specific pathogen-free NOD mice lacking MyD88 protein (an adaptor for multiple innate immune receptors that recognize microbial stimuli) do not develop T1D. The effect is dependent on commensal microbes because germ-free MyD88-negative NOD mice develop robust diabetes, whereas colonization of these germ-free MyD88-negative NOD mice with a defined microbial consortium (representing bacterial phyla normally present in human gut) attenuates T1D. We also find that MyD88 deficiency changes the composition of the distal gut microbiota, and that exposure to the microbiota of specific pathogen-free MyD88-negative NOD donors attenuates T1D in germ-free NOD recipients. Together, these findings indicate that interaction of the intestinal microbes with the innate immune system is a critical epigenetic factor modifying T1D predisposition.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2574766/" 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/PMC2574766/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wen, Li -- Ley, Ruth E -- Volchkov, Pavel Yu -- Stranges, Peter B -- Avanesyan, Lia -- Stonebraker, Austin C -- Hu, Changyun -- Wong, F Susan -- Szot, Gregory L -- Bluestone, Jeffrey A -- Gordon, Jeffrey I -- Chervonsky, Alexander V -- DK063452/DK/NIDDK NIH HHS/ -- DK30292/DK/NIDDK NIH HHS/ -- DK42086/DK/NIDDK NIH HHS/ -- DK45735/DK/NIDDK NIH HHS/ -- DK70977/DK/NIDDK NIH HHS/ -- P30 DK042086/DK/NIDDK NIH HHS/ -- P30 DK042086-16/DK/NIDDK NIH HHS/ -- P30 DK045735/DK/NIDDK NIH HHS/ -- P30 DK045735-10/DK/NIDDK NIH HHS/ -- P30 DK045735-119006/DK/NIDDK NIH HHS/ -- P30 DK056341/DK/NIDDK NIH HHS/ -- P30 DK056341-07/DK/NIDDK NIH HHS/ -- P30 DK056341-08/DK/NIDDK NIH HHS/ -- P30 DK063720/DK/NIDDK NIH HHS/ -- P30 DK063720-01/DK/NIDDK NIH HHS/ -- P30 DK63720/DK/NIDDK NIH HHS/ -- R01 DK030292/DK/NIDDK NIH HHS/ -- R01 DK030292-24/DK/NIDDK NIH HHS/ -- R01 DK070977/DK/NIDDK NIH HHS/ -- R01 DK070977-04/DK/NIDDK NIH HHS/ -- R21 DK063452/DK/NIDDK NIH HHS/ -- R21 DK063452-02/DK/NIDDK NIH HHS/ -- R37 AI046643/AI/NIAID NIH HHS/ -- R37 AI046643-10/AI/NIAID NIH HHS/ -- R37 AI46643/AI/NIAID NIH HHS/ -- England -- Nature. 2008 Oct 23;455(7216):1109-13. doi: 10.1038/nature07336. Epub 2008 Sep 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Section of Endocrinology, Yale University School of Medicine, New Haven, Connecticut 06520, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18806780" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacteria/classification/genetics/*immunology/isolation & purification ; CD8-Positive T-Lymphocytes/immunology ; Diabetes Mellitus, Type 1/genetics/*immunology/*microbiology ; Female ; Immunity, Innate/genetics/*immunology ; Interferon-gamma/immunology ; Intestines/*microbiology ; Islets of Langerhans/pathology ; Male ; Mice ; Mice, Inbred NOD ; Mice, Knockout ; Mice, SCID ; Molecular Sequence Data ; Myeloid Differentiation Factor 88/genetics ; Phylogeny ; Specific Pathogen-Free Organisms ; Time Factors
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  • 148
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    Nature Publishing Group (NPG)
    Publication Date: 2008-09-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2008 Sep 18;455(7211):263-4. doi: 10.1038/455263b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18800078" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Ecology/*methods/trends ; *Ecosystem ; *Human Activities ; Nature
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  • 149
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    Nature Publishing Group (NPG)
    Publication Date: 2008-07-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Spinney, Laura -- England -- Nature. 2008 Jul 10;454(7201):151-3. doi: 10.1038/454151a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18615055" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture/history ; Animals ; *Archaeology ; Burial/history ; *Culture ; Ecosystem ; Great Britain ; History, Ancient ; North Sea ; Technology/history ; Territoriality
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  • 150
    Publication Date: 2008-09-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marnett, Lawrence J -- England -- Nature. 2008 Sep 18;455(7211):300-1. doi: 10.1038/455300a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18800126" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arabidopsis/enzymology/genetics ; Cytochrome P-450 Enzyme System/chemistry/genetics/metabolism ; Evolution, Molecular ; Intramolecular Oxidoreductases/*chemistry/genetics/*metabolism ; Oxylipins/*metabolism
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  • 151
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    Nature Publishing Group (NPG)
    Publication Date: 2008-02-01
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jones, Dan -- England -- Nature. 2008 Jan 31;451(7178):512-5. doi: 10.1038/451512a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18235473" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Physiological ; Aggression/*physiology/psychology ; Altruism ; Anger/physiology ; Animals ; Antisocial Personality Disorder/physiopathology ; *Biological Evolution ; Conflict (Psychology) ; Female ; History, 15th Century ; History, 16th Century ; History, 17th Century ; History, 18th Century ; History, 19th Century ; History, 20th Century ; History, 21st Century ; History, Medieval ; *Homicide/history/psychology ; Humans ; Male ; Models, Biological ; Morals ; Pan troglodytes/physiology ; Prefrontal Cortex/anatomy & histology/physiology ; Sex Characteristics ; United Nations ; Violence/psychology ; Warfare
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  • 152
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    Nature Publishing Group (NPG)
    Publication Date: 2008-12-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Spradling, Allan C -- Howard Hughes Medical Institute/ -- England -- Nature. 2008 Dec 4;456(7222):583-5. doi: 10.1038/456583a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19052613" target="_blank"〉PubMed〈/a〉
    Keywords: Aging/*physiology ; Animals ; Cell Dedifferentiation ; Cell Division ; Centrosome/*metabolism ; Drosophila melanogaster/*cytology ; Male ; *Spermatogenesis ; Spermatozoa/*cytology ; Stem Cells/*cytology ; Testis/cytology
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  • 153
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    Publication Date: 2008-01-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wenner, Melinda -- England -- Nature. 2008 Jan 24;451(7177):388-9. doi: 10.1038/451388a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18216825" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Endogenous Retroviruses/genetics/immunology ; Genetic Complementation Test ; HIV Infections/*complications/immunology/virology ; HIV-1/immunology/pathogenicity/*physiology ; Herpesvirus 6, Human/pathogenicity/*physiology ; Herpesvirus 7, Human/physiology ; Host-Pathogen Interactions ; Humans ; Mice ; Models, Immunological ; Palatine Tonsil/immunology/virology ; Roseolovirus Infections/*complications/immunology/virology ; Superinfection/*immunology/microbiology/prevention & control/*virology ; Tissue Culture Techniques ; Virus Replication
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  • 154
    Publication Date: 2008-02-01
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Crews, David -- Bull, James J -- England -- Nature. 2008 Jan 31;451(7178):527-8. doi: 10.1038/451527a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18235487" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Physiological/*physiology ; Animals ; Body Size ; Fadrozole/pharmacology ; Female ; Lizards/*embryology/*physiology ; Male ; Models, Biological ; Ovum/drug effects/growth & development ; Reproduction/physiology ; Sex Characteristics ; Sex Differentiation/*physiology ; *Temperature
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  • 155
    Publication Date: 2008-02-01
    Description: Cohesin complexes mediate sister-chromatid cohesion in dividing cells but may also contribute to gene regulation in postmitotic cells. How cohesin regulates gene expression is not known. Here we describe cohesin-binding sites in the human genome and show that most of these are associated with the CCCTC-binding factor (CTCF), a zinc-finger protein required for transcriptional insulation. CTCF is dispensable for cohesin loading onto DNA, but is needed to enrich cohesin at specific binding sites. Cohesin enables CTCF to insulate promoters from distant enhancers and controls transcription at the H19/IGF2 (insulin-like growth factor 2) locus. This role of cohesin seems to be independent of its role in cohesion. We propose that cohesin functions as a transcriptional insulator, and speculate that subtle deficiencies in this function contribute to 'cohesinopathies' such as Cornelia de Lange syndrome.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wendt, Kerstin S -- Yoshida, Keisuke -- Itoh, Takehiko -- Bando, Masashige -- Koch, Birgit -- Schirghuber, Erika -- Tsutsumi, Shuichi -- Nagae, Genta -- Ishihara, Ko -- Mishiro, Tsuyoshi -- Yahata, Kazuhide -- Imamoto, Fumio -- Aburatani, Hiroyuki -- Nakao, Mitsuyoshi -- Imamoto, Naoko -- Maeshima, Kazuhiro -- Shirahige, Katsuhiko -- Peters, Jan-Michael -- England -- Nature. 2008 Feb 14;451(7180):796-801. doi: 10.1038/nature06634. Epub 2008 Jan 30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Research Institute of Molecular Pathology, Dr. Bohr Gasse 7, 1030 Vienna, Austria.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18235444" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Brain/cytology/metabolism ; Cell Cycle Proteins/*metabolism ; Cell Differentiation ; Chromosomal Proteins, Non-Histone/*metabolism ; Consensus Sequence/genetics ; DNA/genetics/metabolism ; DNA-Binding Proteins/*metabolism ; Enhancer Elements, Genetic/genetics ; Female ; Gene Expression Regulation/*genetics ; Genome, Human/genetics ; HeLa Cells ; Humans ; Insulin-Like Growth Factor II/genetics ; Mice ; Mitosis ; Mothers ; Nuclear Proteins/*metabolism ; Promoter Regions, Genetic/genetics ; RNA, Long Noncoding ; RNA, Untranslated/genetics ; Repressor Proteins/*metabolism ; Transcription, Genetic/*genetics
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  • 156
    Publication Date: 2008-06-20
    Description: Lancelets ('amphioxus') are the modern survivors of an ancient chordate lineage, with a fossil record dating back to the Cambrian period. Here we describe the structure and gene content of the highly polymorphic approximately 520-megabase genome of the Florida lancelet Branchiostoma floridae, and analyse it in the context of chordate evolution. Whole-genome comparisons illuminate the murky relationships among the three chordate groups (tunicates, lancelets and vertebrates), and allow not only reconstruction of the gene complement of the last common chordate ancestor but also partial reconstruction of its genomic organization, as well as a description of two genome-wide duplications and subsequent reorganizations in the vertebrate lineage. These genome-scale events shaped the vertebrate genome and provided additional genetic variation for exploitation during vertebrate evolution.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Putnam, Nicholas H -- Butts, Thomas -- Ferrier, David E K -- Furlong, Rebecca F -- Hellsten, Uffe -- Kawashima, Takeshi -- Robinson-Rechavi, Marc -- Shoguchi, Eiichi -- Terry, Astrid -- Yu, Jr-Kai -- Benito-Gutierrez, E Lia -- Dubchak, Inna -- Garcia-Fernandez, Jordi -- Gibson-Brown, Jeremy J -- Grigoriev, Igor V -- Horton, Amy C -- de Jong, Pieter J -- Jurka, Jerzy -- Kapitonov, Vladimir V -- Kohara, Yuji -- Kuroki, Yoko -- Lindquist, Erika -- Lucas, Susan -- Osoegawa, Kazutoyo -- Pennacchio, Len A -- Salamov, Asaf A -- Satou, Yutaka -- Sauka-Spengler, Tatjana -- Schmutz, Jeremy -- Shin-I, Tadasu -- Toyoda, Atsushi -- Bronner-Fraser, Marianne -- Fujiyama, Asao -- Holland, Linda Z -- Holland, Peter W H -- Satoh, Nori -- Rokhsar, Daniel S -- BBS/B/12067/Biotechnology and Biological Sciences Research Council/United Kingdom -- BBS/B/12067/2/Biotechnology and Biological Sciences Research Council/United Kingdom -- Biotechnology and Biological Sciences Research Council/United Kingdom -- Wellcome Trust/United Kingdom -- England -- Nature. 2008 Jun 19;453(7198):1064-71. doi: 10.1038/nature06967.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Energy Joint Genome Institute, Walnut Creek, California 94598, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18563158" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Chordata/classification/*genetics ; Conserved Sequence ; DNA Transposable Elements/genetics ; *Evolution, Molecular ; Gene Duplication ; Genes/genetics ; Genetic Linkage ; Genome/*genetics ; Humans ; Introns/genetics ; Karyotyping ; Multigene Family ; Phylogeny ; Polymorphism, Genetic/genetics ; Proteins/genetics ; Synteny ; Time Factors ; Vertebrates/classification/genetics
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  • 157
    Publication Date: 2008-06-20
    Description: T helper (T(H)) cells constitute an important arm of the adaptive immune system because they coordinate defence against specific pathogens, and their unique cytokines and effector functions mediate different types of tissue inflammation. The recently discovered T(H)17 cells, the third subset of effector T helper cells, have been the subject of intense research aimed at understanding their role in immunity and disease. Here we review emerging data suggesting that T(H)17 cells have an important role in host defence against specific pathogens and are potent inducers of autoimmunity and tissue inflammation. In addition, the differentiation factors responsible for their generation have revealed an interesting reciprocal relationship with regulatory T (T(reg)) cells, which prevent tissue inflammation and mediate self-tolerance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bettelli, Estelle -- Korn, Thomas -- Oukka, Mohamed -- Kuchroo, Vijay K -- R01 AI073542/AI/NIAID NIH HHS/ -- R01 AI073542-01/AI/NIAID NIH HHS/ -- R01 AI073542-02/AI/NIAID NIH HHS/ -- R01 NS059996/NS/NINDS NIH HHS/ -- England -- Nature. 2008 Jun 19;453(7198):1051-7. doi: 10.1038/nature07036.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Neurologic Diseases, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18563156" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Autoimmune Diseases/immunology/pathology ; Cytokines/immunology/metabolism ; Humans ; Interleukin-17/*immunology/*metabolism ; T-Lymphocytes, Helper-Inducer/classification/*cytology/*immunology/metabolism ; T-Lymphocytes, Regulatory/immunology ; Transcription Factors/metabolism
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  • 158
    Publication Date: 2008-07-03
    Description: Specificity of sensory neurons requires restricted expression of one sensory receptor gene and the exclusion of all others within a given cell. In the Drosophila retina, functional identity of photoreceptors depends on light-sensitive Rhodopsins (Rhs). The much simpler larval eye (Bolwig organ) is composed of about 12 photoreceptors, eight of which are green-sensitive (Rh6) and four blue-sensitive (Rh5). The larval eye becomes the adult extraretinal 'eyelet' composed of four green-sensitive (Rh6) photoreceptors. Here we show that, during metamorphosis, all Rh6 photoreceptors die, whereas the Rh5 photoreceptors switch fate by turning off Rh5 and then turning on Rh6 expression. This switch occurs without apparent changes in the programme of transcription factors that specify larval photoreceptor subtypes. We also show that the transcription factor Senseless (Sens) mediates the very different cellular behaviours of Rh5 and Rh6 photoreceptors. Sens is restricted to Rh5 photoreceptors and must be excluded from Rh6 photoreceptors to allow them to die at metamorphosis. Finally, we show that Ecdysone receptor (EcR) functions autonomously both for the death of larval Rh6 photoreceptors and for the sensory switch of Rh5 photoreceptors to express Rh6. This fate switch of functioning, terminally differentiated neurons provides a novel, unexpected example of hard-wired sensory plasticity.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2750042/" 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/PMC2750042/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sprecher, Simon G -- Desplan, Claude -- C06 RR-15518-01/RR/NCRR NIH HHS/ -- EY013010/EY/NEI NIH HHS/ -- R01 EY013010/EY/NEI NIH HHS/ -- R01 EY013010-01/EY/NEI NIH HHS/ -- England -- Nature. 2008 Jul 24;454(7203):533-7. doi: 10.1038/nature07062. Epub 2008 Jun 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Developmental Genetics, Department of Biology, New York University, 1090 Silver Center, 100 Washington Square East, New York, New York 10003-6688, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18594514" target="_blank"〉PubMed〈/a〉
    Keywords: Aging ; Animals ; Apoptosis ; *Cell Differentiation ; Drosophila/*cytology/*growth & development ; Drosophila Proteins/genetics/metabolism ; Eye/growth & development ; *Gene Expression Regulation, Developmental ; Larva/anatomy & histology/growth & development ; Metamorphosis, Biological ; Nuclear Proteins/metabolism ; Photoreceptor Cells, Invertebrate/*cytology/*metabolism ; Receptors, Steroid/metabolism ; Rhodopsin/genetics/*metabolism ; Transcription Factors/metabolism
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  • 159
    Publication Date: 2008-08-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bevan, Michael J -- Fink, Pamela J -- England -- Nature. 2008 Aug 14;454(7206):837-8. doi: 10.1038/454837a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18704076" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Fingolimod Hydrochloride ; Immunosuppressive Agents/*pharmacology ; Lymph Nodes/*drug effects/immunology ; Lymphocytes/drug effects/immunology/virology ; Lymphocytic Choriomeningitis/drug therapy/*immunology ; Lymphocytic choriomeningitis virus/immunology ; Mice ; Propylene Glycols/*pharmacology ; Sphingosine/*analogs & derivatives/pharmacology
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  • 160
    Publication Date: 2008-11-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Crucifix, Michel -- England -- Nature. 2008 Nov 6;456(7218):47-8. doi: 10.1038/456047a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18987729" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Atlantic Ocean ; *Climate ; Cold Temperature ; Earth (Planet) ; Eukaryotic Cells/metabolism ; History, Ancient ; *Ice Cover ; Seasons ; Solar System ; *Water Movements
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  • 161
    Publication Date: 2008-03-21
    Description: The RE1-silencing transcription factor (REST, also known as NRSF) is a master repressor of neuronal gene expression and neuronal programmes in non-neuronal lineages. Recently, REST was identified as a human tumour suppressor in epithelial tissues, suggesting that its regulation may have important physiological and pathological consequences. However, the pathways controlling REST have yet to be elucidated. Here we show that REST is regulated by ubiquitin-mediated proteolysis, and use an RNA interference (RNAi) screen to identify a Skp1-Cul1-F-box protein complex containing the F-box protein beta-TRCP (SCF(beta-TRCP)) as an E3 ubiquitin ligase responsible for REST degradation. beta-TRCP binds and ubiquitinates REST and controls its stability through a conserved phospho-degron. During neural differentiation, REST is degraded in a beta-TRCP-dependent manner. beta-TRCP is required for proper neural differentiation only in the presence of REST, indicating that beta-TRCP facilitates this process through degradation of REST. Conversely, failure to degrade REST attenuates differentiation. Furthermore, we find that beta-TRCP overexpression, which is common in human epithelial cancers, causes oncogenic transformation of human mammary epithelial cells and that this pathogenic function requires REST degradation. Thus, REST is a key target in beta-TRCP-driven transformation and the beta-TRCP-REST axis is a new regulatory pathway controlling neurogenesis.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2688689/" 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/PMC2688689/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Westbrook, Thomas F -- Hu, Guang -- Ang, Xiaolu L -- Mulligan, Peter -- Pavlova, Natalya N -- Liang, Anthony -- Leng, Yumei -- Maehr, Rene -- Shi, Yang -- Harper, J Wade -- Elledge, Stephen J -- F31 NS054507-01/NS/NINDS NIH HHS/ -- R01 AG011085/AG/NIA NIH HHS/ -- R01 AG011085-16/AG/NIA NIH HHS/ -- R01 GM054137/GM/NIGMS NIH HHS/ -- R01 GM054137-13/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2008 Mar 20;452(7185):370-4. doi: 10.1038/nature06780.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Genetics, Harvard Partners Center for Genetics and Genomics, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18354483" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell Differentiation ; Cell Line, Tumor ; *Cell Transformation, Neoplastic ; Conserved Sequence ; Humans ; Mice ; Neurons/*cytology/*pathology ; Phosphorylation ; Protein Processing, Post-Translational ; RNA Interference ; Repressor Proteins/genetics/*metabolism ; SKP Cullin F-Box Protein Ligases/*metabolism ; Substrate Specificity ; Transcription Factors/genetics/*metabolism ; Ubiquitin/metabolism ; beta-Transducin Repeat-Containing Proteins/genetics/*metabolism
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  • 162
    facet.materialart.
    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2008-09-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marris, Emma -- England -- Nature. 2008 Sep 18;455(7211):277-80. doi: 10.1038/455277a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18800107" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Conservation of Natural Resources/methods ; *Ecosystem ; Human Activities ; Models, Biological ; Nature ; Poland ; Time Factors ; *Trees/physiology
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  • 163
    Publication Date: 2008-02-22
    Description: Emerging infectious diseases (EIDs) are a significant burden on global economies and public health. Their emergence is thought to be driven largely by socio-economic, environmental and ecological factors, but no comparative study has explicitly analysed these linkages to understand global temporal and spatial patterns of EIDs. Here we analyse a database of 335 EID 'events' (origins of EIDs) between 1940 and 2004, and demonstrate non-random global patterns. EID events have risen significantly over time after controlling for reporting bias, with their peak incidence (in the 1980s) concomitant with the HIV pandemic. EID events are dominated by zoonoses (60.3% of EIDs): the majority of these (71.8%) originate in wildlife (for example, severe acute respiratory virus, Ebola virus), and are increasing significantly over time. We find that 54.3% of EID events are caused by bacteria or rickettsia, reflecting a large number of drug-resistant microbes in our database. Our results confirm that EID origins are significantly correlated with socio-economic, environmental and ecological factors, and provide a basis for identifying regions where new EIDs are most likely to originate (emerging disease 'hotspots'). They also reveal a substantial risk of wildlife zoonotic and vector-borne EIDs originating at lower latitudes where reporting effort is low. We conclude that global resources to counter disease emergence are poorly allocated, with the majority of the scientific and surveillance effort focused on countries from where the next important EID is least likely to originate.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jones, Kate E -- Patel, Nikkita G -- Levy, Marc A -- Storeygard, Adam -- Balk, Deborah -- Gittleman, John L -- Daszak, Peter -- R01 AI079231/AI/NIAID NIH HHS/ -- R01 TW005869/TW/FIC NIH HHS/ -- T32 HD007338/HD/NICHD NIH HHS/ -- England -- Nature. 2008 Feb 21;451(7181):990-3. doi: 10.1038/nature06536.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Zoology, Zoological Society of London, Regents Park, London NW1 4RY, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18288193" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Communicable Diseases, Emerging/*epidemiology/microbiology/transmission/virology ; Databases, Factual ; Drug Resistance, Microbial ; Environment ; Geography ; Humans ; Incidence ; Risk ; Socioeconomic Factors ; Zoonoses/epidemiology/microbiology/transmission/virology
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  • 164
    Publication Date: 2008-10-10
    Description: Generation of long-term antibody-mediated immunity depends on the germinal centre reaction, which requires cooperation between antigen-specific T and B lymphocytes. In human X-linked lymphoproliferative disease and its gene-targeted mouse model, loss-of-function mutations in signalling lymphocyte activation molecule-associated protein (SAP, encoded by SH2D1a) cause a profound defect in germinal centre formation by an as yet unknown mechanism. Here, using two-photon intravital imaging, we show that SAP deficiency selectively impairs the ability of CD4(+) T cells to stably interact with cognate B cells but not antigen-presenting dendritic cells. This selective defect results in a failure of antigen-specific B cells to receive adequate levels of contact-dependent T-cell help to expand normally, despite Sap(-/-) T cells exhibiting the known characteristics of otherwise competent helper T cells. Furthermore, the lack of stable interactions with B cells renders Sap(-/-) T cells unable to be efficiently recruited to and retained in a nascent germinal centre to sustain the germinal centre reaction. These results offer an explanation for the germinal centre defect due to SAP deficiency and provide new insights into the bi-directional communication between cognate T and B cells in vivo.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2652134/" 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/PMC2652134/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Qi, Hai -- Cannons, Jennifer L -- Klauschen, Frederick -- Schwartzberg, Pamela L -- Germain, Ronald N -- Z01 AI000545-19/Intramural NIH HHS/ -- England -- Nature. 2008 Oct 9;455(7214):764-9. doi: 10.1038/nature07345.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lymphocyte Biology Section, Laboratory of Immunology, National Institute of Allergy and Infectious 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/18843362" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; B-Lymphocytes/*cytology/*immunology ; CD4-Positive T-Lymphocytes/*cytology/*immunology ; Cell Adhesion ; Cell Communication ; Cells, Cultured ; Chimera/immunology ; Dendritic Cells/immunology ; Germinal Center/*cytology/*immunology ; Intracellular Signaling Peptides and Proteins/deficiency/genetics/*metabolism ; Lymphocyte Activation ; Mice
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  • 165
    Publication Date: 2008-08-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cruikshank, Scott J -- Connors, Barry W -- P50 MH086400/MH/NIMH NIH HHS/ -- R01 NS025983/NS/NINDS NIH HHS/ -- England -- Nature. 2008 Aug 14;454(7206):839-40. doi: 10.1038/454839a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18704078" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cerebral Cortex/*physiology ; Electroencephalography ; Membrane Potentials/physiology ; Mice ; Neurons/*physiology ; Wakefulness/*physiology
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  • 166
    facet.materialart.
    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2008-03-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Spruston, Nelson -- England -- Nature. 2008 Mar 27;452(7186):420-1. doi: 10.1038/452420a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18368109" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials/physiology ; Animals ; Dendrites/*physiology ; *Models, Neurological ; Neuronal Plasticity/*physiology ; Pyramidal Cells/*cytology/*metabolism ; Shal Potassium Channels/metabolism
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  • 167
    Publication Date: 2008-08-12
    Description: Human Argonaute (Ago) proteins are essential components of the RNA-induced silencing complexes (RISCs). Argonaute 2 (Ago2) has a P-element-induced wimpy testis (PIWI) domain, which folds like RNase H and is responsible for target RNA cleavage in RNA interference. Proteins such as Dicer, TRBP, MOV10, RHA, RCK/p54 and KIAA1093 associate with Ago proteins and participate in small RNA processing, RISC loading and localization of Ago proteins in the cytoplasmic messenger RNA processing bodies. However, mechanisms that regulate RNA interference remain obscure. Here we report physical interactions between Ago2 and the alpha-(P4H-alpha(I)) and beta-(P4H-beta) subunits of the type I collagen prolyl-4-hydroxylase (C-P4H(I)). Mass spectrometric analysis identified hydroxylation of the endogenous Ago2 at proline 700. In vitro, both Ago2 and Ago4 seem to be more efficiently hydroxylated than Ago1 and Ago3 by recombinant human C-P4H(I). Importantly, human cells depleted of P4H-alpha(I) or P4H-beta by short hairpin RNA and P4H-alpha(I) null mouse embryonic fibroblast cells showed reduced stability of Ago2 and impaired short interfering RNA programmed RISC activity. Furthermore, mutation of proline 700 to alanine also resulted in destabilization of Ago2, thus linking Ago2 P700 and hydroxylation at this residue to its stability regulation. These findings identify hydroxylation as a post-translational modification important for Ago2 stability and effective RNA interference.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2661850/" 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/PMC2661850/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Qi, Hank H -- Ongusaha, Pat P -- Myllyharju, Johanna -- Cheng, Dongmei -- Pakkanen, Outi -- Shi, Yujiang -- Lee, Sam W -- Peng, Junmin -- Shi, Yang -- AG025688/AG/NIA NIH HHS/ -- GM53874/GM/NIGMS NIH HHS/ -- R01 GM053874/GM/NIGMS NIH HHS/ -- R01 GM053874-15/GM/NIGMS NIH HHS/ -- England -- Nature. 2008 Sep 18;455(7211):421-4. doi: 10.1038/nature07186. Epub 2008 Aug 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Harvard Medical School, New Research Building 854, 77 Avenue Louis Pasteur, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18690212" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Argonaute Proteins ; Enzyme Stability ; Eukaryotic Initiation Factor-2/*chemistry/genetics/*metabolism ; HeLa Cells ; Humans ; Hydroxylation ; Mice ; MicroRNAs/genetics ; Proline/*metabolism ; Protein Binding ; Protein Subunits ; RNA-Induced Silencing Complex/genetics/metabolism
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  • 168
    Publication Date: 2008-06-20
    Description: The vertebrate body axis is subdivided into repeated segments, best exemplified by the vertebrae that derive from embryonic somites. The number of somites is precisely defined for any given species but varies widely from one species to another. To determine the mechanism controlling somite number, we have compared somitogenesis in zebrafish, chicken, mouse and corn snake embryos. Here we present evidence that in all of these species a similar 'clock-and-wavefront' mechanism operates to control somitogenesis; in all of them, somitogenesis is brought to an end through a process in which the presomitic mesoderm, having first increased in size, gradually shrinks until it is exhausted, terminating somite formation. In snake embryos, however, the segmentation clock rate is much faster relative to developmental rate than in other amniotes, leading to a greatly increased number of smaller-sized somites.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gomez, Celine -- Ozbudak, Ertugrul M -- Wunderlich, Joshua -- Baumann, Diana -- Lewis, Julian -- Pourquie, Olivier -- Cancer Research UK/United Kingdom -- Howard Hughes Medical Institute/ -- England -- Nature. 2008 Jul 17;454(7202):335-9. doi: 10.1038/nature07020. Epub 2008 Jun 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18563087" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Body Patterning/genetics ; Chick Embryo/*embryology ; Gene Expression Regulation, Developmental ; Mice/*embryology ; Molecular Sequence Data ; Snakes/*embryology ; Somites/*embryology ; Time Factors ; Zebrafish/*embryology
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  • 169
    Publication Date: 2008-07-25
    Description: In many organisms, population-density sensing and sexual attraction rely on small-molecule-based signalling systems. In the nematode Caenorhabditis elegans, population density is monitored through specific glycosides of the dideoxysugar ascarylose (the 'ascarosides') that promote entry into an alternative larval stage, the non-feeding and highly persistent dauer stage. In addition, adult C. elegans males are attracted to hermaphrodites by a previously unidentified small-molecule signal. Here we show, by means of combinatorial activity-guided fractionation of the C. elegans metabolome, that the mating signal consists of a synergistic blend of three dauer-inducing ascarosides, which we call ascr#2, ascr#3 and ascr#4. This blend of ascarosides acts as a potent male attractant at very low concentrations, whereas at the higher concentrations required for dauer formation the compounds no longer attract males and instead deter hermaphrodites. The ascarosides ascr#2 and ascr#3 carry different, but overlapping, information, as ascr#3 is more potent as a male attractant than ascr#2, whereas ascr#2 is slightly more potent than ascr#3 in promoting dauer formation. We demonstrate that ascr#2, ascr#3 and ascr#4 are strongly synergistic, and that two types of neuron, the amphid single-ciliated sensory neuron type K (ASK) and the male-specific cephalic companion neuron (CEM), are required for male attraction by ascr#3. On the basis of these results, male attraction and dauer formation in C. elegans appear as alternative behavioural responses to a common set of signalling molecules. The ascaroside signalling system thus connects reproductive and developmental pathways and represents a unique example of structure- and concentration-dependent differential activity of signalling molecules.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2774729/" 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/PMC2774729/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Srinivasan, Jagan -- Kaplan, Fatma -- Ajredini, Ramadan -- Zachariah, Cherian -- Alborn, Hans T -- Teal, Peter E A -- Malik, Rabia U -- Edison, Arthur S -- Sternberg, Paul W -- Schroeder, Frank C -- P41 GM079571/GM/NIGMS NIH HHS/ -- P41 GM079571-02/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2008 Aug 28;454(7208):1115-8. doi: 10.1038/nature07168. Epub 2008 Jul 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Biology Division, California Institute of Technology, 1200 E. California Boulevard, Pasadena, California 91125, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18650807" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Caenorhabditis elegans/*drug effects/growth & development/metabolism/*physiology ; Disorders of Sex Development ; Escherichia coli/physiology ; Glycolipids/chemistry/isolation & purification/metabolism/pharmacology ; Hexoses/chemistry/isolation & purification/metabolism/pharmacology ; Male ; Neurons/metabolism ; Population Density ; Sex Attractants/chemistry/isolation & purification/*metabolism/*pharmacology ; Sexual Behavior, Animal/*drug effects/physiology
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  • 170
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    Publication Date: 2008-09-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Curran, Tom -- Ng, Jessica M Y -- England -- Nature. 2008 Sep 18;455(7211):293-4. doi: 10.1038/455293a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18800119" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Hedgehog Proteins/*metabolism ; Humans ; Mice ; Neoplasm Transplantation ; Neoplasms/*metabolism/pathology ; Paracrine Communication/*physiology ; Receptors, G-Protein-Coupled/antagonists & inhibitors/metabolism ; Stromal Cells/metabolism
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  • 171
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    Nature Publishing Group (NPG)
    Publication Date: 2008-12-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cyranoski, David -- England -- Nature. 2008 Dec 4;456(7222):550-1. doi: 10.1038/456550a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19052587" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; China ; Commerce/economics ; Indicators and Reagents/*supply & distribution ; Mice ; *Postal Service/economics ; Science/economics/*instrumentation ; Time Factors
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  • 172
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    Nature Publishing Group (NPG)
    Publication Date: 2008-05-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marris, Emma -- England -- Nature. 2008 May 22;453(7194):446-8. doi: 10.1038/453446a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18497792" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Computer Simulation ; Humans ; *Language ; *Linguistics ; Models, Biological
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  • 173
    Publication Date: 2008-08-23
    Description: As arguably the simplest free-living animals, placozoans may represent a primitive metazoan form, yet their biology is poorly understood. Here we report the sequencing and analysis of the approximately 98 million base pair nuclear genome of the placozoan Trichoplax adhaerens. Whole-genome phylogenetic analysis suggests that placozoans belong to a 'eumetazoan' clade that includes cnidarians and bilaterians, with sponges as the earliest diverging animals. The compact genome shows conserved gene content, gene structure and synteny in relation to the human and other complex eumetazoan genomes. Despite the apparent cellular and organismal simplicity of Trichoplax, its genome encodes a rich array of transcription factor and signalling pathway genes that are typically associated with diverse cell types and developmental processes in eumetazoans, motivating further searches for cryptic cellular complexity and/or as yet unobserved life history stages.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Srivastava, Mansi -- Begovic, Emina -- Chapman, Jarrod -- Putnam, Nicholas H -- Hellsten, Uffe -- Kawashima, Takeshi -- Kuo, Alan -- Mitros, Therese -- Salamov, Asaf -- Carpenter, Meredith L -- Signorovitch, Ana Y -- Moreno, Maria A -- Kamm, Kai -- Grimwood, Jane -- Schmutz, Jeremy -- Shapiro, Harris -- Grigoriev, Igor V -- Buss, Leo W -- Schierwater, Bernd -- Dellaporta, Stephen L -- Rokhsar, Daniel S -- England -- Nature. 2008 Aug 21;454(7207):955-60. doi: 10.1038/nature07191.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Integrative Genomics and Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, USA. msrivast@berkeley.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18719581" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Adhesion ; Conserved Sequence ; Extracellular Matrix/genetics ; Gene Expression Regulation, Developmental ; Genome/*genetics ; Germ Cells ; Humans ; Invertebrates/anatomy & histology/classification/*genetics/*physiology ; Phylogeny ; Reproduction/genetics ; Sequence Analysis, DNA ; Sex ; Signal Transduction ; Synteny ; Transcription Factors/genetics
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  • 174
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    Nature Publishing Group (NPG)
    Publication Date: 2008-10-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Qiu, Jane -- England -- Nature. 2008 Oct 16;455(7215):850-2. doi: 10.1038/455850a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18923484" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture/economics/methods/*trends ; Animals ; Biodiversity ; China ; Food Supply/standards ; Food, Genetically Modified/economics/standards/*utilization ; Humans ; Oryza/economics/*genetics/parasitology ; Plants, Genetically Modified ; Safety
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  • 175
    Publication Date: 2008-02-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉St John, Justin C -- Armstrong, Lyle -- Minger, Stephen L -- Campbell, Keith H S -- England -- Nature. 2008 Feb 7;451(7179):627. doi: 10.1038/451627a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18256643" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Chimera/*embryology ; Embryo Culture Techniques/ethics ; Embryo Research/ethics/*legislation & jurisprudence ; Embryonic Stem Cells/cytology ; Great Britain ; Humans ; Nuclear Transfer Techniques/ethics/*legislation & jurisprudence ; Pluripotent Stem Cells/cytology ; Transplantation, Heterologous
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  • 176
    Publication Date: 2008-10-31
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Whisstock, James C -- Bottomley, Stephen P -- England -- Nature. 2008 Oct 30;455(7217):1189-90. doi: 10.1038/4551189a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18972012" target="_blank"〉PubMed〈/a〉
    Keywords: Amyloid/chemistry/metabolism ; Animals ; Antithrombin III/*chemistry/*metabolism ; Biopolymers/chemistry/metabolism ; Crystallography, X-Ray ; Dimerization ; Humans ; Models, Molecular ; Protein Conformation ; Protein Folding
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  • 177
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    Publication Date: 2008-03-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marris, Emma -- England -- Nature. 2008 Mar 27;452(7186):394-5. doi: 10.1038/452394a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18368084" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Domestic ; Animals, Wild ; Anura/*physiology ; Biodiversity ; Conservation of Natural Resources/*methods ; *Ecosystem ; Extinction, Biological ; Female ; Male ; Population Density
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  • 178
    Publication Date: 2008-07-04
    Description: Neurotrophins (NTs) are important regulators for the survival, differentiation and maintenance of different peripheral and central neurons. NTs bind to two distinct classes of glycosylated receptor: the p75 neurotrophin receptor (p75(NTR)) and tyrosine kinase receptors (Trks). Whereas p75(NTR) binds to all NTs, the Trk subtypes are specific for each NT. The question of whether NTs stimulate p75(NTR) by inducing receptor homodimerization is still under debate. Here we report the 2.6-A resolution crystal structure of neurotrophin-3 (NT-3) complexed to the ectodomain of glycosylated p75(NTR). In contrast to the previously reported asymmetric complex structure, which contains a dimer of nerve growth factor (NGF) bound to a single ectodomain of deglycosylated p75(NTR) (ref. 3), we show that NT-3 forms a central homodimer around which two glycosylated p75(NTR) molecules bind symmetrically. Symmetrical binding occurs along the NT-3 interfaces, resulting in a 2:2 ligand-receptor cluster. A comparison of the symmetrical and asymmetric structures reveals significant differences in ligand-receptor interactions and p75(NTR) conformations. Biochemical experiments indicate that both NT-3 and NGF bind to p75(NTR) with 2:2 stoichiometry in solution, whereas the 2:1 complexes are the result of artificial deglycosylation. We therefore propose that the symmetrical 2:2 complex reflects a native state of p75(NTR) activation at the cell surface. These results provide a model for NTs-p75(NTR) recognition and signal generation, as well as insights into coordination between p75(NTR) and Trks.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gong, Yong -- Cao, Peng -- Yu, Hong-jun -- Jiang, Tao -- England -- Nature. 2008 Aug 7;454(7205):789-93. doi: 10.1038/nature07089. Epub 2008 Jul 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Key Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, Beijing 100101, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18596692" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Crystallography, X-Ray ; Dimerization ; Glycosylation ; Humans ; Ligands ; Models, Molecular ; Neurotrophin 3/*chemistry/genetics/*metabolism ; Protein Binding ; Protein Structure, Tertiary ; Rats ; Receptor, Nerve Growth Factor/*chemistry/genetics/*metabolism ; Spodoptera
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  • 179
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    Nature Publishing Group (NPG)
    Publication Date: 2008-03-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marris, Emma -- England -- Nature. 2008 Mar 20;452(7185):273-7. doi: 10.1038/452273a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18354452" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture/economics/*methods/*trends ; Animals ; Biotechnology/economics/methods/trends ; Crops, Agricultural/genetics/*physiology ; Disasters ; Food Supply ; Food, Genetically Modified/economics ; *Fresh Water/analysis ; Humans ; Plants, Genetically Modified/genetics/physiology ; Rain ; *Water Supply
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  • 180
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    Nature Publishing Group (NPG)
    Publication Date: 2008-02-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Qiu, Jane -- England -- Nature. 2008 Feb 28;451(7182):1034-5. doi: 10.1038/4511034b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18305500" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Migration ; Animals ; *Antelopes/physiology ; China ; Ecology ; *Ecosystem ; *Fraud ; *Photography/standards ; *Railroads ; Tibet
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  • 181
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    Publication Date: 2008-08-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaeberlein, Matt -- P50 AG005136/AG/NIA NIH HHS/ -- P50 AG005136-25/AG/NIA NIH HHS/ -- England -- Nature. 2008 Aug 7;454(7205):709-10. doi: 10.1038/454709a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18685697" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Aging/genetics/*physiology ; *Cell Division ; Cell Polarity/genetics/*physiology ; Chromosome Segregation ; Humans ; Microfilament Proteins/genetics/metabolism ; Saccharomyces cerevisiae/*cytology/genetics ; Saccharomyces cerevisiae Proteins/genetics/metabolism
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  • 182
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    Nature Publishing Group (NPG)
    Publication Date: 2008-08-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2008 Aug 28;454(7208):1029. doi: 10.1038/4541029a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18756202" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Conservation of Natural Resources/*legislation & jurisprudence/trends ; Ecology/*legislation & jurisprudence/methods ; Ecosystem ; *Federal Government ; United States ; United States Government Agencies/legislation & jurisprudence
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  • 183
    Publication Date: 2008-01-19
    Description: Listeria monocytogenes is an intracellular bacterial pathogen that replicates rapidly in the cytosol of host cells during acute infection. Surprisingly, these bacteria were found to occupy vacuoles in liver granuloma macrophages during persistent infection of severe combined immunodeficient (SCID) mice. Here we show that L. monocytogenes can replicate in vacuoles within macrophages. In livers of SCID mice infected for 21 days, we observed bacteria in large LAMP1(+) compartments that we termed spacious Listeria-containing phagosomes (SLAPs). SLAPs were also observed in vitro, and were found to be non-acidic and non-degradative compartments that are generated in an autophagy-dependent manner. The replication rate of bacteria in SLAPs was found to be reduced compared to the rate of those in the cytosol. Listeriolysin O (LLO, encoded by hly), a pore-forming toxin essential for L. monocytogenes virulence, was necessary and sufficient for SLAP formation. A L. monocytogenes mutant with low LLO expression was impaired for phagosome escape but replicated slowly in SLAPs over a 72 h period. Therefore, our studies reveal a role for LLO in promoting L. monocytogenes replication in vacuoles and suggest a mechanism by which this pathogen can establish persistent infection in host macrophages.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Birmingham, Cheryl L -- Canadien, Veronica -- Kaniuk, Natalia A -- Steinberg, Benjamin E -- Higgins, Darren E -- Brumell, John H -- England -- Nature. 2008 Jan 17;451(7176):350-4. doi: 10.1038/nature06479.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cell Biology Program, Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18202661" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Autophagy ; Bacterial Toxins/genetics/*metabolism ; Chronic Disease ; Heat-Shock Proteins/genetics/*metabolism ; Hemolysin Proteins/genetics/*metabolism ; Listeria monocytogenes/*growth & development/metabolism/*pathogenicity ; Listeriosis/microbiology/pathology ; Liver/microbiology ; Lysosome-Associated Membrane Glycoproteins/metabolism ; Macrophages/*cytology/*microbiology ; Mice ; Mice, SCID ; Phagosomes/metabolism/microbiology ; Vacuoles/metabolism/*microbiology ; Virulence
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  • 184
    Publication Date: 2008-05-06
    Description: Evolutionary novelties in the skeleton are usually expressed as changes in the timing of growth of features intrinsically integrated at different hierarchical levels of development. As a consequence, most of the shape-traits observed across species do vary quantitatively rather than qualitatively, in a multivariate space and in a modularized way. Because most phylogenetic analyses normally use discrete, hypothetically independent characters, previous attempts have disregarded the phylogenetic signals potentially enclosed in the shape of morphological structures. When analysing low taxonomic levels, where most variation is quantitative in nature, solving basic requirements like the choice of characters and the capacity of using continuous, integrated traits is of crucial importance in recovering wider phylogenetic information. This is particularly relevant when analysing extinct lineages, where available data are limited to fossilized structures. Here we show that when continuous, multivariant and modularized characters are treated as such, cladistic analysis successfully solves relationships among main Homo taxa. Our attempt is based on a combination of cladistics, evolutionary-development-derived selection of characters, and geometric morphometrics methods. In contrast with previous cladistic analyses of hominid phylogeny, our method accounts for the quantitative nature of the traits, and respects their morphological integration patterns. Because complex phenotypes are observable across different taxonomic groups and are potentially informative about phylogenetic relationships, future analyses should point strongly to the incorporation of these types of trait.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gonzalez-Jose, Rolando -- Escapa, Ignacio -- Neves, Walter A -- Cuneo, Ruben -- Pucciarelli, Hector M -- England -- Nature. 2008 Jun 5;453(7196):775-8. doi: 10.1038/nature06891. Epub 2008 May 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Unidad de Investigacion de Diversidad, Sistematica y Evolucion, Centro Nacional Patagonico, Consejo Nacional de Investigaciones Cientificas y Tecnicas, CONICET, Boulevard Brown 2825, U9120ACF Puerto Madryn, Argentina. rolando@cenpat.edu.ar〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18454137" target="_blank"〉PubMed〈/a〉
    Keywords: Algorithms ; Animals ; *Fossils ; Hominidae/anatomy & histology/*classification/*physiology ; Humans ; *Phylogeny ; Skull/anatomy & histology
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  • 185
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    Publication Date: 2008-02-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marris, Emma -- England -- Nature. 2008 Feb 28;451(7182):1038. doi: 10.1038/4511038b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18305507" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biodiversity ; *Biology/economics ; *Encyclopedias as Topic ; *Internet/economics ; Species Specificity
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  • 186
    Publication Date: 2008-02-26
    Description: The psychosis associated with schizophrenia is characterized by alterations in sensory processing and perception. Some antipsychotic drugs were identified by their high affinity for serotonin 5-HT2A receptors (2AR). Drugs that interact with metabotropic glutamate receptors (mGluR) also have potential for the treatment of schizophrenia. The effects of hallucinogenic drugs, such as psilocybin and lysergic acid diethylamide, require the 2AR and resemble some of the core symptoms of schizophrenia. Here we show that the mGluR2 interacts through specific transmembrane helix domains with the 2AR, a member of an unrelated G-protein-coupled receptor family, to form functional complexes in brain cortex. The 2AR-mGluR2 complex triggers unique cellular responses when targeted by hallucinogenic drugs, and activation of mGluR2 abolishes hallucinogen-specific signalling and behavioural responses. In post-mortem human brain from untreated schizophrenic subjects, the 2AR is upregulated and the mGluR2 is downregulated, a pattern that could predispose to psychosis. These regulatory changes indicate that the 2AR-mGluR2 complex may be involved in the altered cortical processes of schizophrenia, and this complex is therefore a promising new target for the treatment of psychosis.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2743172/" 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/PMC2743172/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gonzalez-Maeso, Javier -- Ang, Rosalind L -- Yuen, Tony -- Chan, Pokman -- Weisstaub, Noelia V -- Lopez-Gimenez, Juan F -- Zhou, Mingming -- Okawa, Yuuya -- Callado, Luis F -- Milligan, Graeme -- Gingrich, Jay A -- Filizola, Marta -- Meana, J Javier -- Sealfon, Stuart C -- G9811527/Medical Research Council/United Kingdom -- P01 DA012923/DA/NIDA NIH HHS/ -- P01 DA012923-06A10004/DA/NIDA NIH HHS/ -- T32 DA007135/DA/NIDA NIH HHS/ -- T32 DA007135-25S1/DA/NIDA NIH HHS/ -- T32 GM062754/GM/NIGMS NIH HHS/ -- England -- Nature. 2008 Mar 6;452(7183):93-7. doi: 10.1038/nature06612. Epub 2008 Feb 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurology, Mount Sinai School of Medicine, New York, New York 10029, USA. javier.maeso@mssm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18297054" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/cytology/metabolism ; Cell Line ; Cells, Cultured ; Down-Regulation ; Hallucinogens/metabolism/pharmacology ; Humans ; Mice ; Models, Molecular ; Multiprotein Complexes/chemistry/genetics/metabolism ; Protein Binding ; Protein Structure, Tertiary ; Psychotic Disorders/drug therapy/genetics/*metabolism ; Receptor, Serotonin, 5-HT2A/analysis/deficiency/genetics/*metabolism ; Receptors, Metabotropic Glutamate/analysis/antagonists & ; inhibitors/genetics/*metabolism ; Schizophrenia/metabolism ; Signal Transduction/drug effects ; Up-Regulation
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  • 187
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    Nature Publishing Group (NPG)
    Publication Date: 2008-10-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cyranoski, David -- England -- Nature. 2008 Oct 2;455(7213):571. doi: 10.1038/455571a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18833236" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Australia ; Cloning, Organism/legislation & jurisprudence/trends ; *Embryonic Stem Cells ; Humans ; Korea ; Parthenogenesis ; Patents as Topic/*ethics/*legislation & jurisprudence ; Research Personnel/*ethics ; *Scientific Misconduct ; Sheep
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  • 188
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    Unknown
    Nature Publishing Group (NPG)
    Publication Date: 2008-09-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cyranoski, David -- England -- Nature. 2008 Sep 18;455(7211):269. doi: 10.1038/455269b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18800093" target="_blank"〉PubMed〈/a〉
    Keywords: Aging/physiology ; Animals ; Humans ; Internationality ; Japan ; Mice ; Patents as Topic/*legislation & jurisprudence ; *Pluripotent Stem Cells/cytology ; Time Factors ; United States ; Universities
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  • 189
    Publication Date: 2008-11-21
    Description: The kidney has an important role in the regulation of acid-base homeostasis. Renal ammonium production and excretion are essential for net acid excretion under basal conditions and during metabolic acidosis. Ammonium is secreted into the urine by the collecting duct, a distal nephron segment where ammonium transport is believed to occur by non-ionic NH(3) diffusion coupled to H(+) secretion. Here we show that this process is largely dependent on the Rhesus factor Rhcg. Mice lacking Rhcg have abnormal urinary acidification due to impaired ammonium excretion on acid loading-a feature of distal renal tubular acidosis. In vitro microperfused collecting ducts of Rhcg(-/-) acid-loaded mice show reduced apical permeability to NH(3) and impaired transepithelial NH(3) transport. Furthermore, Rhcg is localized in epididymal epithelial cells and is required for normal fertility and epididymal fluid pH. We anticipate a critical role for Rhcg in ammonium handling and pH homeostasis both in the kidney and the male reproductive tract.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Biver, Sophie -- Belge, Hendrica -- Bourgeois, Soline -- Van Vooren, Pascale -- Nowik, Marta -- Scohy, Sophie -- Houillier, Pascal -- Szpirer, Josiane -- Szpirer, Claude -- Wagner, Carsten A -- Devuyst, Olivier -- Marini, Anna Maria -- England -- Nature. 2008 Nov 20;456(7220):339-43. doi: 10.1038/nature07518.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Universite Libre de Bruxelles (U.L.B.), Institut de Biologie et de Medecine Moleculaires, Laboratoire de Biologie du Developpement, Gosselies, Belgium.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19020613" target="_blank"〉PubMed〈/a〉
    Keywords: Acidosis/physiopathology ; Acids/metabolism ; Animals ; Biological Transport ; Body Fluids ; Cation Transport Proteins/deficiency/genetics/*metabolism ; Epithelial Cells/metabolism ; Fertility/*physiology ; Gene Deletion ; Genitalia, Male/cytology/metabolism ; Homeostasis ; Hydrogen-Ion Concentration ; Kidney/*physiology ; Kidney Tubules, Collecting/physiology ; Kidney Tubules, Distal/physiology ; Male ; Membrane Glycoproteins/deficiency/genetics/*metabolism ; Mice ; Permeability ; Quaternary Ammonium Compounds/*urine ; Stress, Physiological ; Weight Loss
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  • 190
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    Nature Publishing Group (NPG)
    Publication Date: 2008-09-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Whitfield, John -- England -- Nature. 2008 Sep 18;455(7211):281-4. doi: 10.1038/455281a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18800108" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Austria ; *Biological Evolution ; Biology/*trends ; Congresses as Topic ; Female ; Heredity ; Humans ; Male ; *Models, Biological ; Selection, Genetic
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  • 191
    Publication Date: 2008-10-31
    Description: Calcium signalling in astrocytes couples changes in neural activity to alterations in cerebral blood flow by eliciting vasoconstriction or vasodilation of arterioles. However, the mechanism for how these opposite astrocyte influences provide appropriate changes in vessel tone within an environment that has dynamic metabolic requirements remains unclear. Here we show that the ability of astrocytes to induce vasodilations over vasoconstrictions relies on the metabolic state of the rat brain tissue. When oxygen availability is lowered and astrocyte calcium concentration is elevated, astrocyte glycolysis and lactate release are maximized. External lactate attenuates transporter-mediated uptake from the extracellular space of prostaglandin E(2), leading to accumulation and subsequent vasodilation. In conditions of low oxygen concentration extracellular adenosine also increases, which blocks astrocyte-mediated constriction, facilitating dilation. These data reveal the role of metabolic substrates in regulating brain blood flow and provide a mechanism for differential astrocyte control over cerebrovascular diameter during different states of brain activation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4097022/" 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/PMC4097022/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gordon, Grant R J -- Choi, Hyun B -- Rungta, Ravi L -- Ellis-Davies, Graham C R -- MacVicar, Brian A -- R01 GM053395/GM/NIGMS NIH HHS/ -- R01 GM053395-13/GM/NIGMS NIH HHS/ -- England -- Nature. 2008 Dec 11;456(7223):745-9. doi: 10.1038/nature07525. Epub 2008 Oct 29.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Brain Research Centre, Department of Psychiatry, University of British Columbia, British Columbia T2N 2B5, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18971930" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine/metabolism/pharmacology ; Animals ; Arterioles/drug effects/*metabolism ; Astrocytes/*metabolism ; Brain/*blood supply/*metabolism ; Dinoprostone/metabolism ; Glycolysis ; Lactic Acid/metabolism ; Male ; Organic Anion Transporters/metabolism ; Oxygen/metabolism ; Pressure ; Prostaglandin-Endoperoxide Synthases/metabolism ; Rats ; Rats, Sprague-Dawley ; Vasoconstriction/drug effects/*physiology ; Vasodilation/drug effects/*physiology ; Vasodilator Agents/pharmacology
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  • 192
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    Nature Publishing Group (NPG)
    Publication Date: 2008-09-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Whitfield, John -- England -- Nature. 2008 Sep 4;455(7209):11. doi: 10.1038/455011a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18769401" target="_blank"〉PubMed〈/a〉
    Keywords: Academies and Institutes/economics/*organization & administration/trends ; Animal Diseases/prevention & control/*transmission ; Animals ; Biology/methods/*trends ; Communicable Diseases, Emerging/transmission ; Ecology/methods ; Humans ; *Mathematics ; Social Behavior ; Tennessee ; Zoonoses/transmission
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  • 193
    Publication Date: 2008-05-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Martens, Koen -- Schon, Isa -- England -- Nature. 2008 May 29;453(7195):587. doi: 10.1038/453587b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18509420" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Crustacea/anatomy & histology/*physiology ; Female ; History, 19th Century ; History, Ancient ; Male ; Reproduction, Asexual/*physiology ; Rotifera/*physiology ; Time Factors
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  • 194
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    Nature Publishing Group (NPG)
    Publication Date: 2008-07-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cyranoski, David -- England -- Nature. 2008 Jul 24;454(7203):384-7. doi: 10.1038/454384a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18650885" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; China/epidemiology ; Conservation of Energy Resources/trends ; Conservation of Natural Resources/trends ; Environmental Restoration and Remediation/trends ; Humans ; Public Health/trends ; Research/economics/*trends ; Space Flight/trends ; Ursidae
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  • 195
    Publication Date: 2008-05-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kalaska, John F -- England -- Nature. 2008 Jun 19;453(7198):994-5. doi: 10.1038/nature06366.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18509339" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Arm ; Eating ; Humans ; Macaca mulatta/*physiology ; *Man-Machine Systems ; Motion ; Motor Cortex/*physiology ; Robotics/*instrumentation/*methods
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  • 196
    Publication Date: 2008-12-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gordon, Stephen V -- England -- Nature. 2008 Dec 11;456(7223):700. doi: 10.1038/456700b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19079032" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cattle ; Cattle Diseases/economics ; Foot-and-Mouth Disease/economics ; Great Britain ; Humans ; Mycobacterium bovis/physiology ; Public Health Practice/economics ; Tuberculosis, Bovine/diagnosis/*economics/*prevention & control
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  • 197
    Publication Date: 2008-04-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kalluri, Raghu -- Kanasaki, Keizo -- England -- Nature. 2008 Apr 3;452(7187):543-5. doi: 10.1038/452543a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18385725" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Humans ; Immunity, Innate/immunology ; Interferon-gamma/immunology ; Interleukin-12/immunology ; Macular Degeneration/complications/genetics/therapy ; Mice ; Neovascularization, Pathologic/genetics/*immunology/*prevention & control/therapy ; RNA, Small Interfering/genetics/*immunology/*metabolism ; Toll-Like Receptor 3/deficiency/genetics/*metabolism ; Vascular Endothelial Growth Factor A/genetics
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  • 198
    Publication Date: 2008-07-11
    Description: Structured RNAs embedded in the untranslated regions (UTRs) of messenger RNAs can regulate gene expression. In bacteria, control of a metabolite gene is mediated by the self-cleaving activity of a ribozyme embedded in its 5' UTR. This discovery has raised the question of whether gene-regulating ribozymes also exist in eukaryotic mRNAs. Here we show that highly active hammerhead ribozymes are present in the 3' UTRs of rodent C-type lectin type II (Clec2) genes. Using a hammerhead RNA motif search with relaxed delimitation of the non-conserved regions, we detected ribozyme sequences in which the invariant regions, in contrast to the previously identified continuous hammerheads, occur as two fragments separated by hundreds of nucleotides. Notably, a fragment pair can assemble to form an active hammerhead ribozyme structure between the translation termination and the polyadenylation signals within the 3' UTR. We demonstrate that this hammerhead structure can self-cleave both in vitro and in vivo, and is able to reduce protein expression in mouse cells. These results indicate that an unrecognized mechanism of post-transcriptional gene regulation involving association of discontinuous ribozyme sequences within an mRNA may be modulating the expression of several CLEC2 proteins that function in bone remodelling and the immune response of several mammals.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2612532/" 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/PMC2612532/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Martick, Monika -- Horan, Lucas H -- Noller, Harry F -- Scott, William G -- R01 AI043393/AI/NIAID NIH HHS/ -- R01 AI043393-09/AI/NIAID NIH HHS/ -- R01 GM087721/GM/NIGMS NIH HHS/ -- R01043393/PHS HHS/ -- England -- Nature. 2008 Aug 14;454(7206):899-902. doi: 10.1038/nature07117. Epub 2008 Jul 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Molecular Biology of RNA, University of California, Santa Cruz, California 95064, USA. mmartick@yahoo.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18615019" target="_blank"〉PubMed〈/a〉
    Keywords: 3' Untranslated Regions/genetics ; Animals ; Down-Regulation ; Lectins, C-Type/genetics/metabolism ; Mice ; Models, Molecular ; NIH 3T3 Cells ; Nucleic Acid Conformation ; RNA, Catalytic/chemistry/*genetics/metabolism ; RNA, Messenger/chemistry/*genetics/metabolism ; Rats ; Reverse Transcriptase Polymerase Chain Reaction
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  • 199
    Publication Date: 2008-06-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cyranoski, David -- England -- Nature. 2008 Jun 19;453(7198):962-3. doi: 10.1038/453962a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18563108" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Embryonic Stem Cells/cytology ; Humans ; Japan ; Mice ; *Patents as Topic/legislation & jurisprudence ; *Pluripotent Stem Cells/cytology ; United States
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  • 200
    Publication Date: 2008-03-28
    Description: The retinotectal projection has long been studied experimentally and theoretically, as a model for the formation of topographic brain maps. Neighbouring retinal ganglion cells (RGCs) project their axons to neighbouring positions in the optic tectum, thus re-establishing a continuous neural representation of visual space. Mapping along this axis requires chemorepellent signalling from tectal cells, expressing ephrin-A ligands, to retinal growth cones, expressing EphA receptors. High concentrations of ephrin A, increasing from anterior to posterior, prevent temporal axons from invading the posterior tectum. However, the force that drives nasal axons to extend past the anterior tectum and terminate in posterior regions remains to be identified. We tested whether axon-axon interactions, such as competition, are required for posterior tectum innervation. By transplanting blastomeres from a wild-type (WT) zebrafish into a lakritz (lak) mutant, which lacks all RGCs, we created chimaeras with eyes that contained single RGCs. These solitary RGCs often extended axons into the tectum, where they branched to form a terminal arbor. Here we show that the distal tips of these arbors were positioned at retinotopically appropriate positions, ruling out an essential role for competition in innervation of the ephrin-A-rich posterior tectum. However, solitary arbors were larger and more complex than under normal, crowded conditions, owing to a lack of pruning of proximal branches during refinement of the retinotectal projection. We conclude that dense innervation is not required for targeting of retinal axons within the zebrafish tectum but serves to restrict arbor size and shape.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2885002/" 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/PMC2885002/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gosse, Nathan J -- Nevin, Linda M -- Baier, Herwig -- R01 EY012406/EY/NEI NIH HHS/ -- R01 EY012406-06A2/EY/NEI NIH HHS/ -- R01 EY012406-07/EY/NEI NIH HHS/ -- R01 EY012406-08/EY/NEI NIH HHS/ -- R01 EY012406-09/EY/NEI NIH HHS/ -- R01 EY013855/EY/NEI NIH HHS/ -- R01 EY013855-01A1/EY/NEI NIH HHS/ -- R01 EY013855-02/EY/NEI NIH HHS/ -- R01 EY013855-03/EY/NEI NIH HHS/ -- R01 EY013855-04/EY/NEI NIH HHS/ -- R01 EY013855-05/EY/NEI NIH HHS/ -- R01 EY013855-06/EY/NEI NIH HHS/ -- R01 EY013855-07/EY/NEI NIH HHS/ -- R01 EY013855-08/EY/NEI NIH HHS/ -- England -- Nature. 2008 Apr 17;452(7189):892-5. doi: 10.1038/nature06816. Epub 2008 Mar 26.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Program in Developmental Biology, University of California, San Francisco, Department of Physiology, 1550 Fourth Street, San Francisco, California 94158-2324, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18368050" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/*physiology ; DNA-Binding Proteins/genetics/metabolism ; Models, Neurological ; Retinal Ganglion Cells/*cytology/*physiology ; Superior Colliculi/*cytology/*physiology ; Zebrafish/*physiology ; Zebrafish Proteins/genetics/metabolism
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