Molecular adaptation during a rapid adaptive radiation.

Molecular adaptation during a rapid adaptive radiation.
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DOI:
10.1093/molbev/mst013
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发表时间:
2013-05
影响因子:
10.7
通讯作者:
Filatov DA
Filatov DA
中科院分区:
生物学1区
文献类型:
--
作者:
Kapralov MV;Votintseva AA;Filatov DA

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岛屿上的“爆炸性”适应辐射仍然是最令人困惑的进化现象之一,这种辐射背后的进化遗传过程仍然不清楚。在岛屿辐射期间,快速的形态和生态进化表明,许多基因可能受到相当强的选择,尽管这一点尚未得到证实。在这里,我们报告说,在夏威夷特有的植物属Schiedea(嘉鱼科),5在36个研究基因进化的积极选择下,最近迅速多样化。积极选择的基因涉及防御机制、光合作用和繁殖。与八个大陆植物群的比较表明,在夏威夷Schiedea的净化选择和更广泛的积极选择的放松。这提供了令人信服的证据,蛋白质编码基因的适应性进化可能在岛屿适应性辐射过程中发挥重要作用。
“Explosive” adaptive radiations on islands remain one of the most puzzling evolutionary phenomena and the evolutionary genetic processes behind such radiations remain unclear. Rapid morphological and ecological evolution during island radiations suggests that many genes may be under fairly strong selection, although this remains untested. Here, we report that during a rapid recent diversification in the Hawaiian endemic plant genus Schiedea (Caryophyllaceae), 5 in 36 studied genes evolved under positive selection. Positively selected genes are involved in defence mechanisms, photosynthesis, and reproduction. Comparison with eight mainland plant groups demonstrates both the relaxation of purifying selection and more widespread positive selection in Hawaiian Schiedea. This provides compelling evidence that adaptive evolution of protein-coding genes may play a significant role during island adaptive radiations.
DOI: 10.1038/nature06341
发表时间: 2007-11-08
期刊: NATURE
影响因子: 64.8
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