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Adaptive Evolution of the STRA6 Genes in Mammalian

文献类型： 外文期刊

作者： Wu, Jianghong 1 ; Xiang, Hui; Qi, Yunxia 1 ; Yang, Ding 1 ; Wang, Xiaojuan 1 ; Sun, Hailian 1 ; Wang, Feng 2 ; Liu, Bi 1 ;

作者机构： 1.Chinese Acad Sci, Inner Mongolia Prataculture Res Ctr, Hohhot, Peoples R China

2.Inner Mongolia Acad Agr & Anim Husb Sci, Anim Husb Inst, Hohhot, Peoples R China

3.Chinese Acad Sci, Kunming Inst Zool, Kunming, Peop

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2014 年 9 卷 9 期

页码：

收录情况： SCI

摘要： Stimulated by retinoic acid 6 (STRA6) is the receptor for retinol binding protein and is relevant for the transport of retinol to specific sites such as the eye. The adaptive evolution mechanism that vertebrates have occupied nearly every habitat available on earth and adopted various lifestyles associated with different light conditions and visual challenges, as well as their role in development and adaptation is thus far unknown. In this work, we have investigated different aspects of vertebrate STRA6 evolution and used molecular evolutionary analyses to detect evidence of vertebrate adaptation to the lightless habitat. Free-ratio model revealed significant rate shifts immediately after the species divergence. The amino acid sites detected to be under positive selection are within the extracellular loops of STRA6 protein. Branch-site model A test revealed that STRA6 has undergone positive selection in the different phyla of mammalian except for the branch of rodent. The results suggest that interactions between different light environments and host may be driving adaptive change in STRA6 by competition between species. In support of this, we found that altered functional constraints may take place at some amino acid residues after speciation. We suggest that STRA6 has undergone adaptive evolution in different branch of vertebrate relation to habitat environment.

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