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  • 1
    Publication Date: 2015-05-30
    Description: We investigated global patterns of variation in 157 whole-genome sequences of Vibrio parahaemolyticus , a free-living and seafood associated marine bacterium. Pandemic clones, responsible for recent outbreaks of gastroenteritis in humans, have spread globally. However, there are oceanic gene pools, one located in the oceans surrounding Asia and another in the Mexican Gulf. Frequent recombination means that most isolates have acquired the genetic profile of their current location. We investigated the genetic structure in the Asian gene pool by calculating the effective population size in two different ways. Under standard neutral models, the two estimates should give similar answers but we found a 27-fold difference. We propose that this discrepancy is caused by the subdivision of the species into a hundred or more ecotypes which are maintained stably in the population. To investigate the genetic factors involved, we used 51 unrelated isolates to conduct a genome-wide scan for epistatically interacting loci. We found a single example of strong epistasis between distant genome regions. A majority of strains had a type VI secretion system associated with bacterial killing. The remaining strains had genes associated with biofilm formation and regulated by cyclic dimeric GMP signaling. All strains had one or other of the two systems and none of isolate had complete complements of both systems, although several strains had remnants. Further "top down" analysis of patterns of linkage disequilibrium within frequently recombining species will allow a detailed understanding of how selection acts to structure the pattern of variation within natural bacterial populations.
    Print ISSN: 0737-4038
    Electronic ISSN: 1537-1719
    Topics: Biology
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  • 2
    Publication Date: 2010-05-08
    Description: Neandertals, the closest evolutionary relatives of present-day humans, lived in large parts of Europe and western Asia before disappearing 30,000 years ago. We present a draft sequence of the Neandertal genome composed of more than 4 billion nucleotides from three individuals. Comparisons of the Neandertal genome to the genomes of five present-day humans from different parts of the world identify a number of genomic regions that may have been affected by positive selection in ancestral modern humans, including genes involved in metabolism and in cognitive and skeletal development. We show that Neandertals shared more genetic variants with present-day humans in Eurasia than with present-day humans in sub-Saharan Africa, suggesting that gene flow from Neandertals into the ancestors of non-Africans occurred before the divergence of Eurasian groups from each other.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Green, Richard E -- Krause, Johannes -- Briggs, Adrian W -- Maricic, Tomislav -- Stenzel, Udo -- Kircher, Martin -- Patterson, Nick -- Li, Heng -- Zhai, Weiwei -- Fritz, Markus Hsi-Yang -- Hansen, Nancy F -- Durand, Eric Y -- Malaspinas, Anna-Sapfo -- Jensen, Jeffrey D -- Marques-Bonet, Tomas -- Alkan, Can -- Prufer, Kay -- Meyer, Matthias -- Burbano, Hernan A -- Good, Jeffrey M -- Schultz, Rigo -- Aximu-Petri, Ayinuer -- Butthof, Anne -- Hober, Barbara -- Hoffner, Barbara -- Siegemund, Madlen -- Weihmann, Antje -- Nusbaum, Chad -- Lander, Eric S -- Russ, Carsten -- Novod, Nathaniel -- Affourtit, Jason -- Egholm, Michael -- Verna, Christine -- Rudan, Pavao -- Brajkovic, Dejana -- Kucan, Zeljko -- Gusic, Ivan -- Doronichev, Vladimir B -- Golovanova, Liubov V -- Lalueza-Fox, Carles -- de la Rasilla, Marco -- Fortea, Javier -- Rosas, Antonio -- Schmitz, Ralf W -- Johnson, Philip L F -- Eichler, Evan E -- Falush, Daniel -- Birney, Ewan -- Mullikin, James C -- Slatkin, Montgomery -- Nielsen, Rasmus -- Kelso, Janet -- Lachmann, Michael -- Reich, David -- Paabo, Svante -- GM40282/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- Intramural NIH HHS/ -- New York, N.Y. -- Science. 2010 May 7;328(5979):710-22. doi: 10.1126/science.1188021.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Evolutionary Genetics, Max-Planck Institute for Evolutionary Anthropology, D-04103 Leipzig, Germany. green@eva.mpg.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20448178" target="_blank"〉PubMed〈/a〉
    Keywords: African Continental Ancestry Group/genetics ; Animals ; Asian Continental Ancestry Group/genetics ; Base Sequence ; Bone and Bones ; DNA, Mitochondrial/genetics ; European Continental Ancestry Group/genetics ; Evolution, Molecular ; Extinction, Biological ; Female ; *Fossils ; Gene Dosage ; Gene Flow ; Genetic Variation ; *Genome ; *Genome, Human ; Haplotypes ; Hominidae/*genetics ; Humans ; Pan troglodytes/genetics ; Polymorphism, Single Nucleotide ; Selection, Genetic ; Sequence Alignment ; *Sequence Analysis, DNA ; Time
    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: 2003-03-08
    Description: Helicobacter pylori, a chronic gastric pathogen of human beings, can be divided into seven populations and subpopulations with distinct geographical distributions. These modern populations derive their gene pools from ancestral populations that arose in Africa, Central Asia, and East Asia. Subsequent spread can be attributed to human migratory fluxes such as the prehistoric colonization of Polynesia and the Americas, the neolithic introduction of farming to Europe, the Bantu expansion within Africa, and the slave trade.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Falush, Daniel -- Wirth, Thierry -- Linz, Bodo -- Pritchard, Jonathan K -- Stephens, Matthew -- Kidd, Mark -- Blaser, Martin J -- Graham, David Y -- Vacher, Sylvie -- Perez-Perez, Guillermo I -- Yamaoka, Yoshio -- Megraud, Francis -- Otto, Kristina -- Reichard, Ulrike -- Katzowitsch, Elena -- Wang, Xiaoyan -- Achtman, Mark -- Suerbaum, Sebastian -- R02GM63270/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2003 Mar 7;299(5612):1582-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Max-Planck Institut fur Infektionsbiologie, 10117 Berlin, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12624269" target="_blank"〉PubMed〈/a〉
    Keywords: Africa ; Agriculture ; Americas ; Asia ; Bacterial Proteins/genetics ; Bayes Theorem ; Continental Population Groups ; *Emigration and Immigration ; Ethnic Groups ; Europe ; Genes, Bacterial ; Genetic Variation ; *Genetics, Population ; Geography ; Helicobacter Infections/*microbiology/transmission ; Helicobacter pylori/classification/*genetics/isolation & purification ; Humans ; Indians, North American ; Language ; *Polymorphism, Genetic ; Polynesia ; Recombination, Genetic ; Social Problems ; Software
    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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  • 4
    Publication Date: 2015-03-20
    Description: Fine-scale genetic variation between human populations is interesting as a signature of historical demographic events and because of its potential for confounding disease studies. We use haplotype-based statistical methods to analyse genome-wide single nucleotide polymorphism (SNP) data from a carefully chosen geographically diverse sample of 2,039 individuals from the United Kingdom. This reveals a rich and detailed pattern of genetic differentiation with remarkable concordance between genetic clusters and geography. The regional genetic differentiation and differing patterns of shared ancestry with 6,209 individuals from across Europe carry clear signals of historical demographic events. We estimate the genetic contribution to southeastern England from Anglo-Saxon migrations to be under half, and identify the regions not carrying genetic material from these migrations. We suggest significant pre-Roman but post-Mesolithic movement into southeastern England from continental Europe, and show that in non-Saxon parts of the United Kingdom, there exist genetically differentiated subgroups rather than a general 'Celtic' population.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4632200/" 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/PMC4632200/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Leslie, Stephen -- Winney, Bruce -- Hellenthal, Garrett -- Davison, Dan -- Boumertit, Abdelhamid -- Day, Tammy -- Hutnik, Katarzyna -- Royrvik, Ellen C -- Cunliffe, Barry -- Wellcome Trust Case Control Consortium 2 -- International Multiple Sclerosis Genetics Consortium -- Lawson, Daniel J -- Falush, Daniel -- Freeman, Colin -- Pirinen, Matti -- Myers, Simon -- Robinson, Mark -- Donnelly, Peter -- Bodmer, Walter -- 072974/Wellcome Trust/United Kingdom -- 072974/Z/03/Z/Wellcome Trust/United Kingdom -- 075491/Wellcome Trust/United Kingdom -- 075491/Z/04/A/Wellcome Trust/United Kingdom -- 075491/Z/04/B/Wellcome Trust/United Kingdom -- 075491/Z/04/Z/Wellcome Trust/United Kingdom -- 084818/Wellcome Trust/United Kingdom -- 084818/Z/08/Z/Wellcome Trust/United Kingdom -- 085475/Z/08/Z/Wellcome Trust/United Kingdom -- 085475DONNELLY/Wellcome Trust/United Kingdom -- 088262/Wellcome Trust/United Kingdom -- 088262/Z/09/Z/Wellcome Trust/United Kingdom -- 090532/Wellcome Trust/United Kingdom -- 090532/Z/09/Z/Wellcome Trust/United Kingdom -- 095552/Wellcome Trust/United Kingdom -- 095552/Z/11/Z/Wellcome Trust/United Kingdom -- 098386/Wellcome Trust/United Kingdom -- 098386/Z/12/Z/Wellcome Trust/United Kingdom -- 098387/Wellcome Trust/United Kingdom -- 098387/Z/12/Z/Wellcome Trust/United Kingdom -- England -- Nature. 2015 Mar 19;519(7543):309-14. doi: 10.1038/nature14230.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Murdoch Childrens Research Institute, Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia [2] University of Melbourne, Department of Mathematics and Statistics, Parkville, Victoria 3010, Australia [3] University of Oxford, Department of Oncology, Old Road Campus Research Building, Roosevelt Drive, Oxford OX3 7DQ, UK. ; University of Oxford, Department of Oncology, Old Road Campus Research Building, Roosevelt Drive, Oxford OX3 7DQ, UK. ; University College London Genetics Institute, Darwin Building, Gower Street, London WC1E 6BT, UK. ; Counsyl, 180 Kimball Way, South San Francisco, California 94080, USA. ; University of Oxford, Institute of Archaeology, 36 Beaumont Street, Oxford OX1 2PG, UK. ; University of Bristol, Department of Mathematics, University Walk, Bristol BS8 1TW, UK. ; College of Medicine, Swansea University, Singleton Park, Swansea SA2 8PP, UK. ; The Wellcome Trust Centre for Human Genetics, Roosevelt Drive, Oxford OX3 7BN, UK. ; University of Helsinki, P.O. Box 20, Helsinki, FI-00014, Finland. ; University of Oxford, Department of Statistics, 1 South Parks Road, Oxford OX1 3TG, UK. ; University of Oxford, University Museum of Natural History, Parks Road, Oxford OX1 3PW, UK. ; 1] The Wellcome Trust Centre for Human Genetics, Roosevelt Drive, Oxford OX3 7BN, UK [2] University of Oxford, Department of Statistics, 1 South Parks Road, Oxford OX1 3TG, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25788095" target="_blank"〉PubMed〈/a〉
    Keywords: Algorithms ; European Continental Ancestry Group/genetics ; *Genetics, Population ; Great Britain/ethnology ; Haplotypes/*genetics ; Humans ; Polymorphism, Single Nucleotide/*genetics ; Principal Component Analysis
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 5
    Publication Date: 2008-04-12
    Description: The nature of species boundaries in bacteria remains controversial. In particular, the mechanisms of bacterial speciation and maintenance in the face of frequent genetic exchange are poorly understood. Here, we report patterns of genetic exchange that show two closely related zoonotic pathogenic species, Campylobacter jejuni and Campylobacter coli, are converging as a consequence of recent changes in gene flow. Population expansion into a novel ecological niche generated by human activity is the most probable explanation for the increase in genetic exchange between these species. Bacterial speciation can therefore occur by mechanisms analogous to those seen in metazoans, where genetic diversification and incipient speciation caused by ecological factors have been reported in several genera.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sheppard, Samuel K -- McCarthy, Noel D -- Falush, Daniel -- Maiden, Martin C J -- 047072/Wellcome Trust/United Kingdom -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2008 Apr 11;320(5873):237-9. doi: 10.1126/science.1155532.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departments of Zoology and Statistics, University of Oxford, Peter Medawar Building, South Parks Road, Oxford OX1 3SY, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18403712" target="_blank"〉PubMed〈/a〉
    Keywords: Agriculture ; Alleles ; Animals ; *Biological Evolution ; Campylobacter coli/classification/*genetics/isolation & purification ; Campylobacter jejuni/classification/*genetics/isolation & purification ; Cluster Analysis ; Gene Flow ; Genes, Bacterial ; *Genetic Speciation ; Genetic Variation ; Haplotypes ; Humans ; *Hybridization, Genetic ; Intestines/microbiology ; Recombination, Genetic
    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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  • 6
    Publication Date: 2014-02-18
    Description: Modern genetic data combined with appropriate statistical methods have the potential to contribute substantially to our understanding of human history. We have developed an approach that exploits the genomic structure of admixed populations to date and characterize historical mixture events at fine scales. We used this to produce an atlas of worldwide human admixture history, constructed by using genetic data alone and encompassing over 100 events occurring over the past 4000 years. We identified events whose dates and participants suggest they describe genetic impacts of the Mongol empire, Arab slave trade, Bantu expansion, first millennium CE migrations in Eastern Europe, and European colonialism, as well as unrecorded events, revealing admixture to be an almost universal force shaping human populations.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4209567/" 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/PMC4209567/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hellenthal, Garrett -- Busby, George B J -- Band, Gavin -- Wilson, James F -- Capelli, Cristian -- Falush, Daniel -- Myers, Simon -- 090532/Wellcome Trust/United Kingdom -- 098386/Wellcome Trust/United Kingdom -- 098386/Z/12/Z/Wellcome Trust/United Kingdom -- 098387/Wellcome Trust/United Kingdom -- 098387/Z/12/Z/Wellcome Trust/United Kingdom -- Biotechnology and Biological Sciences Research Council/United Kingdom -- New York, N.Y. -- Science. 2014 Feb 14;343(6172):747-51. doi: 10.1126/science.1243518.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉UCL Genetics Institute, University College London, Gower Street, London WC1E 6BT, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24531965" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Chromosome Painting/methods ; *Computer Simulation ; DNA/genetics ; Europe, Eastern/ethnology ; Genetic Drift ; *Genotyping Techniques ; Haplotypes ; History, Ancient ; Human Migration/*history ; Humans ; Middle East/ethnology ; *Models, Genetic ; Mongolia/ethnology ; Polymorphism, Single Nucleotide ; Population/*genetics ; Software
    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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  • 10
    Publication Date: 2004-03-29
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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