{"id":72586,"date":"2012-07-17T20:07:04","date_gmt":"2012-07-18T04:07:04","guid":{"rendered":"http:\/\/blogs.discovermagazine.com\/gnxp\/?p=17374"},"modified":"2012-07-17T20:07:04","modified_gmt":"2012-07-18T04:07:04","slug":"identity-by-descent-the-volkerwanderung","status":"publish","type":"post","link":"https:\/\/www.razib.com\/wordpress\/2012\/07\/17\/identity-by-descent-the-volkerwanderung\/","title":{"rendered":"Identity by descent &amp; the V\u00f6lkerwanderung"},"content":{"rendered":"<p><a href=\"http:\/\/blogs.discovermagazine.com\/gnxp\/files\/2012\/07\/europe.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-17375\" title=\"europe\" src=\"http:\/\/blogs.discovermagazine.com\/gnxp\/files\/2012\/07\/europe.jpg\" alt=\"\" width=\"288\" height=\"486\" \/><\/a>Early this year I received an email from <a href=\"http:\/\/www.eve.ucdavis.edu\/plralph\/\">Dr. Peter Ralph<\/a>, inquiring if I might discuss some interesting statistical genetic results from analyses of the POPRES data set which might have historical relevance. I&#8217;ve been excitingly waiting for the preprint to be made public so it could trigger some wider discussion. I believe that the methods outlined in the paper perhaps show us a path into the near future, where we might gain a much sharper perspective upon the recent past. So it&#8217;s finally out, <strong>and you can read it in full.<\/strong> Ralph and Dr. Graham Coop have posted put it up at <a href=\"http:\/\/arxiv.org\/abs\/1207.3815\">arXiv<\/a>, <a href=\"http:\/\/arxiv.org\/abs\/1207.3815\">The geography of recent genetic ancestry across Europe<\/a>. The paper uses ~500,000 SNPs from the POPRES data set individuals, and looks at patterns of <a href=\"http:\/\/en.wikipedia.org\/wiki\/Identity_by_descent\">identity by descent<\/a> as a function of geography. By identity by descent, we&#8217;re talking about segments of the genome which are derived from a common ancestor. Because of recombination the length of the segments can give us a sense of the date of the last common ancestor; long segments indicate more recent ancestry because fewer recombination events have &#8230;<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/feeds.feedburner.com\/~r\/GeneExpressionBlog\/~4\/AH-YjJfcs8Q\" height=\"1\" width=\"1\"\/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Early this year I received an email from Dr. Peter Ralph, inquiring if I might discuss some interesting statistical genetic results from analyses of the POPRES data set which might have historical relevance. I&#8217;ve been excitingly waiting for the p&#8230;<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[55,877,2069,19,2070],"tags":[],"class_list":["post-72586","post","type-post","status-publish","format-standard","hentry","category-demographics","category-europe","category-europe-history","category-history","category-volkerwanderung"],"_links":{"self":[{"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/posts\/72586","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/comments?post=72586"}],"version-history":[{"count":9,"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/posts\/72586\/revisions"}],"predecessor-version":[{"id":72778,"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/posts\/72586\/revisions\/72778"}],"wp:attachment":[{"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/media?parent=72586"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/categories?post=72586"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.razib.com\/wordpress\/wp-json\/wp\/v2\/tags?post=72586"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}