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  • 1
    Publication Date: 2016-08-19
    Description: Fitness landscapes determine the course of adaptation by constraining and shaping evolutionary trajectories. Knowledge of the structure of a fitness landscape can thus predict evolutionary outcomes. Empirical fitness landscapes, however, have so far only offered limited insight into real-world questions, as the high dimensionality of sequence spaces makes it impossible to exhaustively measure the fitness of all variants of biologically meaningful sequences. We must therefore revert to statistical descriptions of fitness landscapes that are based on a sparse sample of fitness measurements. It remains unclear, however, how much data are required for such statistical descriptions to be useful. Here, we assess the ability of regression models accounting for single and pairwise mutations to correctly approximate a complex quasi-empirical fitness landscape. We compare approximations based on various sampling regimes of an RNA landscape and find that the sampling regime strongly influences the quality of the regression. On the one hand it is generally impossible to generate sufficient samples to achieve a good approximation of the complete fitness landscape, and on the other hand systematic sampling schemes can only provide a good description of the immediate neighborhood of a sequence of interest. Nevertheless, we obtain a remarkably good and unbiased fit to the local landscape when using sequences from a population that has evolved under strong selection. Thus, current statistical methods can provide a good approximation to the landscape of naturally evolving populations.
    Print ISSN: 0737-4038
    Electronic ISSN: 1537-1719
    Topics: Biology
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  • 2
    Publication Date: 2000-10-29
    Description: Lentiviral delivery of glial cell line-derived neurotrophic factor (lenti-GDNF) was tested for its trophic effects upon degenerating nigrostriatal neurons in nonhuman primate models of Parkinson's disease (PD). We injected lenti-GDNF into the striatum and substantia nigra of nonlesioned aged rhesus monkeys or young adult rhesus monkeys treated 1 week prior with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). Extensive GDNF expression with anterograde and retrograde transport was seen in all animals. In aged monkeys, lenti-GDNF augmented dopaminergic function. In MPTP-treated monkeys, lenti-GDNF reversed functional deficits and completely prevented nigrostriatal degeneration. Additionally, lenti-GDNF injections to intact rhesus monkeys revealed long-term gene expression (8 months). In MPTP-treated monkeys, lenti-GDNF treatment reversed motor deficits in a hand-reach task. These data indicate that GDNF delivery using a lentiviral vector system can prevent nigrostriatal degeneration and induce regeneration in primate models of PD and might be a viable therapeutic strategy for PD patients.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kordower, J H -- Emborg, M E -- Bloch, J -- Ma, S Y -- Chu, Y -- Leventhal, L -- McBride, J -- Chen, E Y -- Palfi, S -- Roitberg, B Z -- Brown, W D -- Holden, J E -- Pyzalski, R -- Taylor, M D -- Carvey, P -- Ling, Z -- Trono, D -- Hantraye, P -- Deglon, N -- Aebischer, P -- NS40578/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2000 Oct 27;290(5492):767-73.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurological Sciences, Rush Presbyterian-St. Luke's Medical Center, Chicago, IL 60612, USA. jkordowe@rush.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11052933" target="_blank"〉PubMed〈/a〉
    Keywords: 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine ; Aging ; Animals ; Antigens, CD/analysis ; Dihydroxyphenylalanine/*analogs & derivatives/metabolism ; Disease Models, Animal ; Dopamine/*metabolism ; Female ; Gene Expression ; *Genetic Therapy ; Genetic Vectors ; Glial Cell Line-Derived Neurotrophic Factor ; Lentivirus/genetics ; Macaca mulatta ; Neostriatum/metabolism/pathology ; Nerve Degeneration/*prevention & control ; *Nerve Growth Factors ; Nerve Tissue Proteins/*genetics/metabolism/therapeutic use ; Neurons/enzymology ; Parkinson Disease/metabolism/pathology/physiopathology/*therapy ; Parkinsonian Disorders/metabolism/pathology/physiopathology/therapy ; Psychomotor Performance ; Substantia Nigra/metabolism/pathology ; Tyrosine 3-Monooxygenase/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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  • 3
    Publication Date: 2010-06-10
    Description: The autism spectrum disorders (ASDs) are a group of conditions characterized by impairments in reciprocal social interaction and communication, and the presence of restricted and repetitive behaviours. Individuals with an ASD vary greatly in cognitive development, which can range from above average to intellectual disability. Although ASDs are known to be highly heritable ( approximately 90%), the underlying genetic determinants are still largely unknown. Here we analysed the genome-wide characteristics of rare (〈1% frequency) copy number variation in ASD using dense genotyping arrays. When comparing 996 ASD individuals of European ancestry to 1,287 matched controls, cases were found to carry a higher global burden of rare, genic copy number variants (CNVs) (1.19 fold, P = 0.012), especially so for loci previously implicated in either ASD and/or intellectual disability (1.69 fold, P = 3.4 x 10(-4)). Among the CNVs there were numerous de novo and inherited events, sometimes in combination in a given family, implicating many novel ASD genes such as SHANK2, SYNGAP1, DLGAP2 and the X-linked DDX53-PTCHD1 locus. We also discovered an enrichment of CNVs disrupting functional gene sets involved in cellular proliferation, projection and motility, and GTPase/Ras signalling. Our results reveal many new genetic and functional targets in ASD that may lead to final connected pathways.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3021798/" 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/PMC3021798/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pinto, Dalila -- Pagnamenta, Alistair T -- Klei, Lambertus -- Anney, Richard -- Merico, Daniele -- Regan, Regina -- Conroy, Judith -- Magalhaes, Tiago R -- Correia, Catarina -- Abrahams, Brett S -- Almeida, Joana -- Bacchelli, Elena -- Bader, Gary D -- Bailey, Anthony J -- Baird, Gillian -- Battaglia, Agatino -- Berney, Tom -- Bolshakova, Nadia -- Bolte, Sven -- Bolton, Patrick F -- Bourgeron, Thomas -- Brennan, Sean -- Brian, Jessica -- Bryson, Susan E -- Carson, Andrew R -- Casallo, Guillermo -- Casey, Jillian -- Chung, Brian H Y -- Cochrane, Lynne -- Corsello, Christina -- Crawford, Emily L -- Crossett, Andrew -- Cytrynbaum, Cheryl -- Dawson, Geraldine -- de Jonge, Maretha -- Delorme, Richard -- Drmic, Irene -- Duketis, Eftichia -- Duque, Frederico -- Estes, Annette -- Farrar, Penny -- Fernandez, Bridget A -- Folstein, Susan E -- Fombonne, Eric -- Freitag, Christine M -- Gilbert, John -- Gillberg, Christopher -- Glessner, Joseph T -- Goldberg, Jeremy -- Green, Andrew -- Green, Jonathan -- Guter, Stephen J -- Hakonarson, Hakon -- Heron, Elizabeth A -- Hill, Matthew -- Holt, Richard -- Howe, Jennifer L -- Hughes, Gillian -- Hus, Vanessa -- Igliozzi, Roberta -- Kim, Cecilia -- Klauck, Sabine M -- Kolevzon, Alexander -- Korvatska, Olena -- Kustanovich, Vlad -- Lajonchere, Clara M -- Lamb, Janine A -- Laskawiec, Magdalena -- Leboyer, Marion -- Le Couteur, Ann -- Leventhal, Bennett L -- Lionel, Anath C -- Liu, Xiao-Qing -- Lord, Catherine -- Lotspeich, Linda -- Lund, Sabata C -- Maestrini, Elena -- Mahoney, William -- Mantoulan, Carine -- Marshall, Christian R -- McConachie, Helen -- McDougle, Christopher J -- McGrath, Jane -- McMahon, William M -- Merikangas, Alison -- Migita, Ohsuke -- Minshew, Nancy J -- Mirza, Ghazala K -- Munson, Jeff -- Nelson, Stanley F -- Noakes, Carolyn -- Noor, Abdul -- Nygren, Gudrun -- Oliveira, Guiomar -- Papanikolaou, Katerina -- Parr, Jeremy R -- Parrini, Barbara -- Paton, Tara -- Pickles, Andrew -- Pilorge, Marion -- Piven, Joseph -- Ponting, Chris P -- Posey, David J -- Poustka, Annemarie -- Poustka, Fritz -- Prasad, Aparna -- Ragoussis, Jiannis -- Renshaw, Katy -- Rickaby, Jessica -- Roberts, Wendy -- Roeder, Kathryn -- Roge, Bernadette -- Rutter, Michael L -- Bierut, Laura J -- Rice, John P -- Salt, Jeff -- Sansom, Katherine -- Sato, Daisuke -- Segurado, Ricardo -- Sequeira, Ana F -- Senman, Lili -- Shah, Naisha -- Sheffield, Val C -- Soorya, Latha -- Sousa, Ines -- Stein, Olaf -- Sykes, Nuala -- Stoppioni, Vera -- Strawbridge, Christina -- Tancredi, Raffaella -- Tansey, Katherine -- Thiruvahindrapduram, Bhooma -- Thompson, Ann P -- Thomson, Susanne -- Tryfon, Ana -- Tsiantis, John -- Van Engeland, Herman -- Vincent, John B -- Volkmar, Fred -- Wallace, Simon -- Wang, Kai -- Wang, Zhouzhi -- Wassink, Thomas H -- Webber, Caleb -- Weksberg, Rosanna -- Wing, Kirsty -- Wittemeyer, Kerstin -- Wood, Shawn -- Wu, Jing -- Yaspan, Brian L -- Zurawiecki, Danielle -- Zwaigenbaum, Lonnie -- Buxbaum, Joseph D -- Cantor, Rita M -- Cook, Edwin H -- Coon, Hilary -- Cuccaro, Michael L -- Devlin, Bernie -- Ennis, Sean -- Gallagher, Louise -- Geschwind, Daniel H -- Gill, Michael -- Haines, Jonathan L -- Hallmayer, Joachim -- Miller, Judith -- Monaco, Anthony P -- Nurnberger, John I Jr -- Paterson, Andrew D -- Pericak-Vance, Margaret A -- Schellenberg, Gerard D -- Szatmari, Peter -- Vicente, Astrid M -- Vieland, Veronica J -- Wijsman, Ellen M -- Scherer, Stephen W -- Sutcliffe, James S -- Betancur, Catalina -- 075491/Z/04/Wellcome Trust/United Kingdom -- AS2077/Autism Speaks/ -- AS7462/Autism Speaks/ -- G0601030/Medical Research Council/United Kingdom -- HD055751/HD/NICHD NIH HHS/ -- HD055782/HD/NICHD NIH HHS/ -- HD055784/HD/NICHD NIH HHS/ -- HD35465/HD/NICHD NIH HHS/ -- MC_U137761446/Medical Research Council/United Kingdom -- MH061009/MH/NIMH NIH HHS/ -- MH06359/MH/NIMH NIH HHS/ -- MH066673/MH/NIMH NIH HHS/ -- MH080647/MH/NIMH NIH HHS/ -- MH081754/MH/NIMH NIH HHS/ -- MH52708/MH/NIMH NIH HHS/ -- MH55284/MH/NIMH NIH HHS/ -- MH57881/MH/NIMH NIH HHS/ -- MH66766/MH/NIMH NIH HHS/ -- NS026630/NS/NINDS NIH HHS/ -- NS042165/NS/NINDS NIH HHS/ -- NS049261/NS/NINDS NIH HHS/ -- P01 CA089392/CA/NCI NIH HHS/ -- P01 CA089392-08/CA/NCI NIH HHS/ -- P01 HD035465-01S1/HD/NICHD NIH HHS/ -- P01 NS026630/NS/NINDS NIH HHS/ -- P01 NS026630-15/NS/NINDS NIH HHS/ -- P50 HD055748/HD/NICHD NIH HHS/ -- P50 HD055748-01/HD/NICHD NIH HHS/ -- P50 HD055748-02/HD/NICHD NIH HHS/ -- P50 HD055748-03/HD/NICHD NIH HHS/ -- P50 HD055751/HD/NICHD NIH HHS/ -- P50 HD055751-01/HD/NICHD NIH HHS/ -- P50 HD055782/HD/NICHD NIH HHS/ -- P50 HD055782-04/HD/NICHD NIH HHS/ -- R01 DA013423/DA/NIDA NIH HHS/ -- R01 DA013423-05/DA/NIDA NIH HHS/ -- R01 DA019963/DA/NIDA NIH HHS/ -- R01 DA019963-01A2/DA/NIDA NIH HHS/ -- R01 DA019963-02/DA/NIDA NIH HHS/ -- R01 DA019963-03/DA/NIDA NIH HHS/ -- R01 MH052708-05/MH/NIMH NIH HHS/ -- R01 MH055284/MH/NIMH NIH HHS/ -- R01 MH055284-04/MH/NIMH NIH HHS/ -- R01 MH057881/MH/NIMH NIH HHS/ -- R01 MH057881-02/MH/NIMH NIH HHS/ -- R01 MH061009/MH/NIMH NIH HHS/ -- R01 MH061009-05/MH/NIMH NIH HHS/ -- R01 MH080647/MH/NIMH NIH HHS/ -- R01 MH080647-11/MH/NIMH NIH HHS/ -- R01 MH081754/MH/NIMH NIH HHS/ -- R01 MH081754-01/MH/NIMH NIH HHS/ -- R01 NS042165/NS/NINDS NIH HHS/ -- R01 NS042165-05/NS/NINDS NIH HHS/ -- R01 NS049261/NS/NINDS NIH HHS/ -- R01 NS049261-02/NS/NINDS NIH HHS/ -- U01 HG004422/HG/NHGRI NIH HHS/ -- U01 HG004422-02/HG/NHGRI NIH HHS/ -- U10 MH066766-05/MH/NIMH NIH HHS/ -- U19 HD035469/HD/NICHD NIH HHS/ -- U19 HD035469-06/HD/NICHD NIH HHS/ -- U19 HD035469-07/HD/NICHD NIH HHS/ -- U19 HD035469-08/HD/NICHD NIH HHS/ -- U19 HD035469-09/HD/NICHD NIH HHS/ -- U19 HD035469-10/HD/NICHD NIH HHS/ -- U54 MH066673/MH/NIMH NIH HHS/ -- U54 MH066673-05/MH/NIMH NIH HHS/ -- UL1 TR000448/TR/NCATS NIH HHS/ -- Canadian Institutes of Health Research/Canada -- Medical Research Council/United Kingdom -- England -- Nature. 2010 Jul 15;466(7304):368-72. doi: 10.1038/nature09146. Epub 2010 Jun 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Centre for Applied Genomics and Program in Genetics and Genomic Biology, The Hospital for Sick Children, Toronto, Ontario M5G 1L7, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20531469" target="_blank"〉PubMed〈/a〉
    Keywords: Case-Control Studies ; Cell Movement ; Child ; Child Development Disorders, Pervasive/*genetics/pathology/*physiopathology ; Cytoprotection ; DNA Copy Number Variations/*genetics ; Europe/ethnology ; Gene Dosage/*genetics ; Genetic Predisposition to Disease/*genetics ; Genome-Wide Association Study ; Humans ; Signal Transduction ; Social Behavior
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 1988-09-02
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mark, J C -- Davies, T D -- Hoenig, M M -- Leventhal, P L -- New York, N.Y. -- Science. 1988 Sep 2;241(4870):1166-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17740780" target="_blank"〉PubMed〈/a〉
    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: 1976-10-01
    Print ISSN: 0047-2425
    Electronic ISSN: 1537-2537
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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