Adaptive Evolution Patterns in the Pacific Oyster Crassostrea gigas

被引:10
作者
Song, Kai [1 ]
Wen, Shiyong [2 ,3 ]
Zhang, Guofan [4 ]
机构
[1] Qingdao Univ, Sch Math & Stat, Qingdao 266071, Shandong, Peoples R China
[2] Inner Mongolia Agr Univ, Coll Vet Med, Hohhot 010018, Peoples R China
[3] Dezhou State Owned Assets Supervis & Adm Commiss, Dezhou 253000, Peoples R China
[4] Chinese Acad Sci, Inst Oceanol, Key Lab Expt Marine Biol, Qingdao 266071, Shandong, Peoples R China
基金
中国国家自然科学基金;
关键词
Adaptive evolution rates; Gene expression pattern; Crassostrea gigas; PROTEIN EVOLUTION; NEGATIVE SELECTION; IMMUNE-SYSTEM; GENES; ADAPTATION; REVEALS; MUTATIONS; RESPONSES; TRAITS; GROWTH;
D O I
10.1007/s10126-019-09906-w
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Estimation of adaptive evolution rates at the molecular level is important in evolutionary genomics. However, knowledge of adaptive evolutionary patterns in Mollusca is very scarce, especially for oysters. Such information would help clarify how oysters adapt to pathogen-rich and dynamically changing intertidal environments. In this study, we characterized the patterns of adaptive evolution in the Crassostrea gigas genome, using population diversity analysis and congeneric comparison. Our analysis revealed that gene expression patterns were positively associated with adaptive evolution rates, which suggested that positive selection played an important role in gene evolution. The genes with more exons and alternative splicing events had higher adaptive evolution rates. The rates of adaptive evolution in immune-related and stress-response genes were higher than those in other genes, suggesting that these groups of genes experienced strong positive selection. This study represents the first analysis of adaptive evolution rates in oysters and the first comprehensive study of a Mollusca species. These results provide a system-level investigation of association between adaptive evolution rates with some intrinsic genetic factors. They also suggest that adaptation to pathogens and environmental stressors are important forces driving the adaptive evolution of genes.
引用
收藏
页码:614 / 622
页数:9
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