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Expression Divergence of Duplicate Genes in the Protein Kinase Superfamily in Pacific Oyster

文献类型： 外文期刊

作者： Gao, Dahai 1 ; Ko, Dennis C. 2 ; Tian, Xinmin 3 ; Yang, Guang 4 ; Wang, Liuyang 2 ;

作者机构： 1.Chinese Acad Sci, Inst Oceanol, Key Lab Expt Marine Biol, Qingdao, Shandong, Peoples R China

2.Duke Univ, Dept Mol Genet & Microbiol, Med Ctr, Durham, NC 27706 USA

3.Chinese Acad Trop Agr Sci, Trop Crops Genet Resources Res Inst, Danzhou, Hainan, Peoples R China

4.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao, Shandong, Peoples R China

关键词： duplicate genes;Pacific oyster;RNA-seq;protein kinase superfamily

期刊名称：EVOLUTIONARY BIOINFORMATICS （ 影响因子：1.625； 五年影响因子：2.38 ）

ISSN： 1176-9343

年卷期： 2015 年 11 卷

页码：

收录情况： SCI

摘要： Gene duplication has been proposed to serve as the engine of evolutionary innovation. It is well recognized that eukaryotic genomes contain a large number of duplicated genes that evolve new functions or expression patterns. However, in mollusks, the evolutionary mechanisms underlying the divergence and the functional maintenance of duplicate genes remain little understood. In the present study, we performed a comprehensive analysis of duplicate genes in the protein kinase superfamily using whole genome and transcriptome data for the Pacific oyster. A total of 64 duplicated gene pairs were identified based on a phylogenetic approach and the reciprocal best BLAST method. By analyzing gene expression from RNA-seq data from 69 different developmental and stimuli-induced conditions (nine tissues, 38 developmental stages, eight dry treatments, seven heat treatments, and seven salty treatments), we found that expression patterns were significantly correlated for a number of duplicate gene pairs, suggesting the conservation of regulatory mechanisms following divergence. Our analysis also identified a subset of duplicate gene pairs with very high expression divergence, indicating that these gene pairs may have been subjected to transcriptional subfunctionalization or neofunctionalization after the initial duplication events. Further analysis revealed a significant correlation between expression and sequence divergence (as revealed by synonymous or nonsynonymous substitution rates) under certain conditions. Taken together, these results provide evidence for duplicate gene sequence and expression divergence in the Pacific oyster, accompanying its adaptation to harsh environments. Our results provide new insights into the evolution of duplicate genes and their expression levels in the Pacific oyster.

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