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  • 1
    Publication Date: 2012-06-20
    Description: The method presented here refines molecular conformations directly against projections of single particles measured by electron microscopy. By optimizing the orientation of the projection at the same time as the conformation, the method is well-suited to two-dimensional class averages from cryoelectron microscopy. Such direct use of two-dimensional images circumvents the need for a three-dimensional density map, which may be difficult to reconstruct from projections due to structural heterogeneity or preferred orientations of the sample on the grid. Our refinement protocol exploits Natural Move Monte Carlo to model a macromolecule as a small number of segments connected by flexible loops, on multiple scales. After tests on artificial data from lysozyme, we applied the method to the Methonococcus maripaludis chaperonin. We successfully refined its conformation from a closed-state initial model to an open-state final model using just one class-averaged projection. We also used Natural Moves to iteratively refine against heterogeneous projection images of Methonococcus maripaludis chaperonin in a mix of open and closed states. Our results suggest a general method for electron microscopy refinement specially suited to macromolecules with significant conformational flexibility. The algorithm is available in the program Methodologies for Optimization and Sampling In Computational Studies.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 2
    Publication Date: 2014-04-30
    Description: Nucleosomes alter gene expression by preventing transcription factors from occupying binding sites along DNA. DNA methylation can affect nucleosome positioning and so alter gene expression epigenetically (without changing DNA sequence). Conventional methods to predict nucleosome occupancy are trained on observed DNA sequence patterns or known DNA oligonucleotide structures. They are...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 3
    Publication Date: 2009-09-18
    Description: The cerebral cortex is a laminated sheet of neurons composed of the arrays of intersecting radial columns. During development, excitatory projection neurons originating from the proliferative units at the ventricular surface of the embryonic cerebral vesicles migrate along elongated radial glial fibres to form a cellular infrastructure of radial (vertical) ontogenetic columns in the overlaying cortical plate. However, a subpopulation of these clonally related neurons also undergoes a short lateral shift and transfers from their parental to the neighbouring radial glial fibres, and intermixes with neurons originating from neighbouring proliferative units. This columnar organization acts as the primary information processing unit in the cortex. The molecular mechanisms, role and significance of this lateral dispersion for cortical development are not understood. Here we show that an Eph receptor A (EphA) and ephrin A (Efna) signalling-dependent shift in the allocation of clonally related neurons is essential for the proper assembly of cortical columns. In contrast to the relatively uniform labelling of the developing cortical plate by various molecular markers and retrograde tracers in wild-type mice, we found alternating labelling of columnar compartments in Efna knockout mice that are caused by impaired lateral dispersion of migrating neurons rather than by altered cell production or death. Furthermore, in utero electroporation showed that lateral dispersion depends on the expression levels of EphAs and ephrin-As during neuronal migration. This so far unrecognized mechanism for lateral neuronal dispersion seems to be essential for the proper intermixing of neuronal types in the cortical columns, which, when disrupted, might contribute to neuropsychiatric disorders associated with abnormal columnar organization.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2874978/" 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/PMC2874978/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Torii, Masaaki -- Hashimoto-Torii, Kazue -- Levitt, Pat -- Rakic, Pasko -- R01 DA022785/DA/NIDA NIH HHS/ -- R01 DA022785-03/DA/NIDA NIH HHS/ -- R01 DA023999/DA/NIDA NIH HHS/ -- R01 DA023999-01A1/DA/NIDA NIH HHS/ -- R01 DA023999-02/DA/NIDA NIH HHS/ -- R01 NS014841/NS/NINDS NIH HHS/ -- R01 NS014841-30/NS/NINDS NIH HHS/ -- R01 NS014841-31/NS/NINDS NIH HHS/ -- R01 NS038296/NS/NINDS NIH HHS/ -- R01 NS038296-09/NS/NINDS NIH HHS/ -- R01 NS038296-10/NS/NINDS NIH HHS/ -- England -- Nature. 2009 Sep 24;461(7263):524-8. doi: 10.1038/nature08362. Epub 2009 Sep 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology and Kavli Institute for Neuroscience, Yale University School of Medicine, 333 Cedar Street, New Haven, Connecticut 06510, USA. masaaki.torii@yale.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19759535" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell Movement ; Cerebral Cortex/anatomy & histology/cytology/*embryology/metabolism ; Ephrins/deficiency/genetics/*metabolism ; Mice ; Mice, Knockout ; Neocortex/cytology/metabolism ; Neurons/*cytology/*metabolism ; Organogenesis ; Rats ; Receptors, Eph Family/deficiency/genetics/*metabolism ; *Signal Transduction
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 4
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2004-01-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Levitt, Pat -- New York, N.Y. -- Science. 2004 Jan 2;303(5654):48-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Vanderbilt Kennedy Center for Research on Human Development and Department of Pharmacology, Vanderbilt University, Nashville, TN 37203, USA. pat.levitt@vanderbilt.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14704417" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Differentiation ; Cell Lineage ; Cerebral Cortex/*cytology/embryology ; DNA-Binding Proteins/*genetics/*metabolism ; Down-Regulation ; Forkhead Transcription Factors ; Gene Expression Regulation, Developmental ; Mice ; Nerve Tissue Proteins/*genetics/*metabolism ; Neurons/*cytology/*physiology ; Stem Cells/cytology/*physiology ; Time Factors ; Transcription Factors/genetics/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
    Publication Date: 2011-04-23
    Description: Serotonin (5-hydroxytryptamine or 5-HT) is thought to regulate neurodevelopmental processes through maternal-fetal interactions that have long-term mental health implications. It is thought that beyond fetal 5-HT neurons there are significant maternal contributions to fetal 5-HT during pregnancy but this has not been tested empirically. To examine putative central and peripheral sources of embryonic brain 5-HT, we used Pet1(-/-) (also called Fev) mice in which most dorsal raphe neurons lack 5-HT. We detected previously unknown differences in accumulation of 5-HT between the forebrain and hindbrain during early and late fetal stages, through an exogenous source of 5-HT which is not of maternal origin. Using additional genetic strategies, a new technology for studying placental biology ex vivo and direct manipulation of placental neosynthesis, we investigated the nature of this exogenous source. We uncovered a placental 5-HT synthetic pathway from a maternal tryptophan precursor in both mice and humans. This study reveals a new, direct role for placental metabolic pathways in modulating fetal brain development and indicates that maternal-placental-fetal interactions could underlie the pronounced impact of 5-HT on long-lasting mental health outcomes.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3084180/" 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/PMC3084180/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bonnin, Alexandre -- Goeden, Nick -- Chen, Kevin -- Wilson, Melissa L -- King, Jennifer -- Shih, Jean C -- Blakely, Randy D -- Deneris, Evan S -- Levitt, Pat -- 1P50MH078280A1/MH/NIMH NIH HHS/ -- 5R21HD065287/HD/NICHD NIH HHS/ -- P50 MH078028/MH/NIMH NIH HHS/ -- P50 MH078028-01A1/MH/NIMH NIH HHS/ -- P50 MH078028-02/MH/NIMH NIH HHS/ -- P50 MH078028-03/MH/NIMH NIH HHS/ -- P50 MH078028-04/MH/NIMH NIH HHS/ -- P50 MH078028-05/MH/NIMH NIH HHS/ -- R01MH39085/MH/NIMH NIH HHS/ -- R21 HD065287/HD/NICHD NIH HHS/ -- R21 HD065287-01/HD/NICHD NIH HHS/ -- R21 HD065287-02/HD/NICHD NIH HHS/ -- England -- Nature. 2011 Apr 21;472(7343):347-50. doi: 10.1038/nature09972.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Zilkha Neurogenetic Institute, Keck School of Medicine of USC, Los Angeles, California 90089, USA. bonnin@usc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21512572" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Embryo, Mammalian/metabolism ; Female ; Fetus/embryology/*metabolism ; Humans ; In Vitro Techniques ; Maternal-Fetal Exchange/*physiology ; Mice ; Placenta/*metabolism ; Pregnancy ; Prenatal Exposure Delayed Effects ; Prosencephalon/*embryology/*metabolism ; Raphe Nuclei/cytology ; Rhombencephalon/embryology/metabolism ; Serotonin/analysis/*biosynthesis/metabolism ; Time Factors ; Transcription Factors/deficiency/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 2014-04-04
    Description: The anatomical and functional architecture of the human brain is mainly determined by prenatal transcriptional processes. We describe an anatomically comprehensive atlas of the mid-gestational human brain, including de novo reference atlases, in situ hybridization, ultra-high-resolution magnetic resonance imaging (MRI) and microarray analysis on highly discrete laser-microdissected brain regions. In developing cerebral cortex, transcriptional differences are found between different proliferative and post-mitotic layers, wherein laminar signatures reflect cellular composition and developmental processes. Cytoarchitectural differences between human and mouse have molecular correlates, including species differences in gene expression in subplate, although surprisingly we find minimal differences between the inner and outer subventricular zones even though the outer zone is expanded in humans. Both germinal and post-mitotic cortical layers exhibit fronto-temporal gradients, with particular enrichment in the frontal lobe. Finally, many neurodevelopmental disorder and human-evolution-related genes show patterned expression, potentially underlying unique features of human cortical formation. These data provide a rich, freely-accessible resource for understanding human brain development.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4105188/" 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/PMC4105188/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Miller, Jeremy A -- Ding, Song-Lin -- Sunkin, Susan M -- Smith, Kimberly A -- Ng, Lydia -- Szafer, Aaron -- Ebbert, Amanda -- Riley, Zackery L -- Royall, Joshua J -- Aiona, Kaylynn -- Arnold, James M -- Bennet, Crissa -- Bertagnolli, Darren -- Brouner, Krissy -- Butler, Stephanie -- Caldejon, Shiella -- Carey, Anita -- Cuhaciyan, Christine -- Dalley, Rachel A -- Dee, Nick -- Dolbeare, Tim A -- Facer, Benjamin A C -- Feng, David -- Fliss, Tim P -- Gee, Garrett -- Goldy, Jeff -- Gourley, Lindsey -- Gregor, Benjamin W -- Gu, Guangyu -- Howard, Robert E -- Jochim, Jayson M -- Kuan, Chihchau L -- Lau, Christopher -- Lee, Chang-Kyu -- Lee, Felix -- Lemon, Tracy A -- Lesnar, Phil -- McMurray, Bergen -- Mastan, Naveed -- Mosqueda, Nerick -- Naluai-Cecchini, Theresa -- Ngo, Nhan-Kiet -- Nyhus, Julie -- Oldre, Aaron -- Olson, Eric -- Parente, Jody -- Parker, Patrick D -- Parry, Sheana E -- Stevens, Allison -- Pletikos, Mihovil -- Reding, Melissa -- Roll, Kate -- Sandman, David -- Sarreal, Melaine -- Shapouri, Sheila -- Shapovalova, Nadiya V -- Shen, Elaine H -- Sjoquist, Nathan -- Slaughterbeck, Clifford R -- Smith, Michael -- Sodt, Andy J -- Williams, Derric -- Zollei, Lilla -- Fischl, Bruce -- Gerstein, Mark B -- Geschwind, Daniel H -- Glass, Ian A -- Hawrylycz, Michael J -- Hevner, Robert F -- Huang, Hao -- Jones, Allan R -- Knowles, James A -- Levitt, Pat -- Phillips, John W -- Sestan, Nenad -- Wohnoutka, Paul -- Dang, Chinh -- Bernard, Amy -- Hohmann, John G -- Lein, Ed S -- 5R24HD0008836/HD/NICHD NIH HHS/ -- R00 HD061485/HD/NICHD NIH HHS/ -- R01 MH092535/MH/NIMH NIH HHS/ -- R24 HD000836/HD/NICHD NIH HHS/ -- RC2 MH089921/MH/NIMH NIH HHS/ -- RC2MH089921/MH/NIMH NIH HHS/ -- England -- Nature. 2014 Apr 10;508(7495):199-206. doi: 10.1038/nature13185. Epub 2014 Apr 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Allen Institute for Brain Science, Seattle, Washington 98103, USA [2]. ; Allen Institute for Brain Science, Seattle, Washington 98103, USA. ; Division of Genetic Medicine, Department of Pediatrics, University of Washington, 1959 North East Pacific Street, Box 356320, Seattle, Washington 98195, USA. ; 1] Department of Radiology, Harvard Medical School, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts 02129, USA [2] Computer Science and AI Lab, MIT, Cambridge, Massachusetts 02139, USA. ; Department of Neurobiology and Kavli Institute for Neuroscience, Yale School of Medicine, New Haven, Connecticut 06510, USA. ; Department of Radiology, Harvard Medical School, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts 02129, USA. ; 1] Program in Computational Biology and Bioinformatics, Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520, USA [2] Department of Computer Science, Yale University, New Haven, Connecticut 06520, USA. ; Program in Neurogenetics, Department of Neurology and Semel Institute David Geffen School of Medicine, UCLA, Los Angeles, California 90095, USA. ; 1] Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, Washington 98101, USA [2] Department of Neurological Surgery, University of Washington School of Medicine, Seattle, Washington 98105, USA. ; Advanced Imaging Research Center, UT Southwestern Medical Center, Dallas, Texas 75390, USA. ; Zilkha Neurogenetic Institute, and Department of Psychiatry, University of Southern California, Los Angeles, California 90033, USA. ; 1] Department of Pediatrics, Children's Hospital, Los Angeles, California 90027, USA [2] Keck School of Medicine, University of Southern California, Los Angeles, California 90089, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24695229" target="_blank"〉PubMed〈/a〉
    Keywords: Anatomy, Artistic ; Animals ; Atlases as Topic ; Brain/embryology/*metabolism ; Conserved Sequence/genetics ; Fetus/cytology/embryology/*metabolism ; Gene Expression Regulation, Developmental/*genetics ; Gene Regulatory Networks/genetics ; Humans ; Mice ; Neocortex/embryology/metabolism ; Species Specificity ; *Transcriptome
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 2017-08-04
    Description: Photochemical oxidation of aromatic hydrocarbons leads to tropospheric ozone and secondary organic aerosol (SOA) formation, with profound implications for air quality, human health, and climate. Toluene is the most abundant aromatic compound under urban environments, but its detailed chemical oxidation mechanism remains uncertain. From combined laboratory experiments and quantum chemical...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 8
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    Unknown
    American Association for the Advancement of Science (AAAS)
    Publication Date: 1984-01-20
    Description: A monoclonal antibody produced against hippocampal cell membranes labeled the surface of neurons in the rat limbic system. With a few exceptions, all nonlimbic components were unstained. This specific distribution of immunopositive neurons provides strong evidence of molecular specificity among functionally related neurons in the mammalian brain and supports the concept of a limbic system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Levitt, P -- NS 19606/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1984 Jan 20;223(4633):299-301.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6199842" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal ; Axons/immunology ; Brain Stem/immunology ; Cell Membrane/immunology ; Cerebellum/immunology ; Cerebral Cortex/immunology ; Diencephalon/immunology ; Epitopes/*analysis ; Female ; Hippocampus/*immunology ; Hypothalamus/immunology ; Immunoenzyme Techniques ; Limbic System/cytology/*immunology ; Neurons/*immunology ; Rats ; Rats, Inbred Strains ; Spinal Cord/immunology ; Telencephalon/immunology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
    Publication Date: 2018-02-27
    Description: We report results of 13 C/ 12 C, 18 O/ 16 O, and 13 C- 18 O “clumped” isotope analyses from a series of calcite precipitation experiments from aqueous solutions under laboratory conditions. Chemo-stat precipitation experiments were performed to synthetically form calcite from aqueous solution onto 43 Ca-labeled calcite seed crystals. Formation rate was controlled during the experiments to investigate the effect of precipitation rate and temperature on 13 C- 18 O bonding in calcite, where rates ranged from 10 −6.88 to 10 −8.20 mol m −2 s −1 at three temperatures (10, 20, and 30°C). No relation was observed between precipitation rate and 13 C- 18 O bonding proportion over the range of precipitation rates used. The relation between Δ 47 and temperature produced was: (1) Comparing solution conditions across multiple experimental data sets indicates an inverse relation between saturation state and 13 C- 18 O bonding, where high super-saturation conditions are likely to be furthest from equilibrium 13 C- 18 O partitioning. Carbon fractionation factors between calcite and HCO 3 - (aq) were found to be a temperature independent value of +1.6‰. Measured 18 O/ 16 O fractionation factors, yield a temperature relation of: (2) The temperature-dependent calcite-water 18 O/ 16 O fractionation relation determined in this study is slightly different (larger α calcite-H2O value) than those measured in several previous investigations. Significantly, we observe a dependence of the 18 O/ 16 O isotope fractionation factor on growth rate. Taken together, these findings suggest carbonate growth in our experiments approached equilibrium more closely than previous experiments of this type.
    Electronic ISSN: 1525-2027
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Developmental Biology 96 (1983), S. 472-484 
    ISSN: 0012-1606
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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