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タイトル: | Life-cycle modification in open oceans accounts for genome variability in a cosmopolitan phytoplankton |
著者: | Von Dassow, Peter John, Uwe Ogata, Hiroyuki https://orcid.org/0000-0001-6594-377X (unconfirmed) Probert, Ian Bendif, El Mahdi Kegel, Jessica U. Audic, Stéphane Wincker, Patrick Da Silva, Corinne Claverie, Jean Michel Doney, Scott Glover, David M. Flores, Daniella Mella Herrera, Yeritza Lescot, Magali Garet-Delmas, Marie José De Vargas, Colomban |
著者名の別形: | 緒方, 博之 |
キーワード: | Ecology, Evolution, Behavior and Systematics Microbiology |
発行日: | Dec-2014 |
出版者: | Nature Publishing Group |
誌名: | ISME Journal |
巻: | 9 |
開始ページ: | 1365 |
終了ページ: | 1377 |
抄録: | Emiliania huxleyi is the most abundant calcifying plankton in modern oceans with substantial intraspecific genome variability and a biphasic life cycle involving sexual alternation between calcified 2N and flagellated 1N cells. We show that high genome content variability in Emiliania relates to erosion of 1N-specific genes and loss of the ability to form flagellated cells. Analysis of 185 E. huxleyi strains isolated from world oceans suggests that loss of flagella occurred independently in lineages inhabiting oligotrophic open oceans over short evolutionary timescales. This environmentally linked physiogenomic change suggests life cycling is not advantageous in very large/diluted populations experiencing low biotic pressure and low ecological variability. Gene loss did not appear to reflect pressure for genome streamlining in oligotrophic oceans as previously observed in picoplankton. Life-cycle modifications might be common in plankton and cause major functional variability to be hidden from traditional taxonomic or molecular markers. |
記述: | Supplementary Information accompanies this paper on The ISME Journal website (http://www.nature.com/ismej) |
著作権等: | © 2015 International Society for Microbial Ecology. All rights reserved. This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 3.0 Unported License. The images or other third partymaterial in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if thematerial is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/ licenses/by-nc-sa/3.0/ |
URI: | http://hdl.handle.net/2433/227402 |
DOI(出版社版): | 10.1038/ismej.2014.221 |
PubMed ID: | 25461969 |
出現コレクション: | 学術雑誌掲載論文等 |
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