{"id":2510,"date":"2013-04-29T15:20:55","date_gmt":"2013-04-29T15:20:55","guid":{"rendered":"http:\/\/thetravellerslastjourney.com\/shai\/?p=2510"},"modified":"2019-07-14T02:34:44","modified_gmt":"2019-07-14T02:34:44","slug":"parallel-evolutionary-dynamics-of-adaptive-diversification","status":"publish","type":"post","link":"https:\/\/thetravellerslastjourney.com\/shai\/2013\/04\/29\/parallel-evolutionary-dynamics-of-adaptive-diversification\/","title":{"rendered":"Science Review: Parallel evolutionary dynamics of adaptive diversification"},"content":{"rendered":"

There is a Research Highlights piece (in<\/a> Nat Rev Gen [Nature Review Genetics]<\/span>) on a paper entitled Parallel evolutionary dynamics of adaptive diversification in Escherichia coli (in PLoS Biol<\/a>), which studies the principle of\u00a0sympatric diversification<\/strong>, which is the “organismal diversification or speciation that occurs without […] geographical separation of [the] diverging populations”.<\/p>\n

Background to experiment: the same authors had shown that a single strain grown in the presence of both glucose and acetate diversify into coexisting stable populations that (relatively) specialize in using either glucose\/acetate.<\/p>\n

Experiment: Same as before, but now conduct whole-genome sequencing from three replicate diverged populations. Sequence not only at end-point, but also use frozen samples collected in intermediate generations.<\/p>\n

Results: All three replicates had similar evolutionary trajectories: rare glucose-specialization mutations (100 generations) eventually dominate (300 gen’s), after which acetate-specialization mutations gain frequency, until eventually, both types co-exist at intermediate levels until end of experiment (1045 gen’s).<\/p>\n

This is consistent with frequency-dependent selection<\/strong>\u00a0in which the frequency of one strain causes (and so correlates with) the selective pressure on another strain. Here dominance of glucose metabolizers would create a relative excess of acetate enabling an advantage for acetate metabolizers.<\/p>\n","protected":false},"excerpt":{"rendered":"

There is a Research Highlights piece (in Nat Rev Gen [Nature Review Genetics]) on a paper entitled Parallel evolutionary dynamics of adaptive diversification in Escherichia coli (in PLoS Biol), which studies the principle of\u00a0sympatric diversification, which is the “organismal diversification or speciation that occurs without […] geographical separation of [the] diverging populations”. Background to experiment: […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[159,242,16,17],"tags":[],"metadata":[],"class_list":["post-2510","post","type-post","status-publish","format-standard","hentry","category-all-posts","category-evernote-entries","category-science","category-science-news"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":2472,"url":"https:\/\/thetravellerslastjourney.com\/shai\/2013\/04\/07\/science-review-adaptive-diversification-2\/","url_meta":{"origin":2510,"position":0},"title":"Science Review: Adaptive diversification","author":"Pala","date":"April 7, 2013","format":false,"excerpt":"Concept: Adaptive diversification. Also: allopatric diversification; sympatric diversification; frequency-dependent selection. Source: An (original research) article published in PLoS Biology\u00a0(February 19, 2013) Background: A dichotomy of diversification follows depending on whether the\u00a0ancestral populations were geographically isolated from each other (allopatric diversification) or not (sympatric diversification). 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