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Selective modes determine evolutionary rates, gene compactness and expression patterns in Brassica

文献类型： 外文期刊

作者： Guo, Yue 1 ; Liu, Jing 1 ; Zhang, Jiefu 2 ; Liu, Shengyi 3 ; Du, Jianchang 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Biotechnol, Prov Key Lab Agrobiol, Nanjing 210014, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Ind Crops, Key Lab Cotton & Rapeseed, Minist Agr Peoples Republ China, Nanjing 210014, Jiangsu, Peoples R China

3.Chinese Acad Agr Sci, Oil Crops Res Inst, Key Lab Biol & Genet Improvement Oil Crops, Minist Agr Peoples Republ China, Wuhan 430062, Peoples R China

关键词： Brassica;nonsynonymous substitution;positive selection;purifying selection;synonymous substitution

期刊名称：PLANT JOURNAL （ 影响因子：6.417； 五年影响因子：7.627 ）

ISSN： 0960-7412

年卷期： 2017 年 91 卷 1 期

页码：

收录情况： SCI

摘要： It has been well documented that most nuclear protein-coding genes in organisms can be classified into two categories: positively selected genes (PSGs) and negatively selected genes (NSGs). The characteristics and evolutionary fates of different types of genes, however, have been poorly understood. In this study, the rates of nonsynonymous substitution (K-a) and the rates of synonymous substitution (K-s) were investigated by comparing the orthologs between the two sequenced Brassica species, Brassica rapa and Brassica oleracea, and the evolutionary rates, gene structures, expression patterns, and codon bias were compared between PSGs and NSGs. The resulting data show that PSGs have higher protein evolutionary rates, lower synonymous substitution rates, shorter gene length, fewer exons, higher functional specificity, lower expression level, higher tissue-specific expression and stronger codon bias than NSGs. Although the quantities and values are different, the relative features of PSGs and NSGs have been largely verified in the model species Arabidopsis. These data suggest that PSGs and NSGs differ not only under selective pressure (K-a/K-s), but also in their evolutionary, structural and functional properties, indicating that selective modes may serve as a determinant factor for measuring evolutionary rates, gene compactness and expression patterns in Brassica.

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