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Population transcriptomics reveals weak parallel genetic basis in repeated marine and freshwater divergence in nine-spined sticklebacks

文献类型： 外文期刊

作者： Wang, Yingnan 1 ; Zhao, Yongxin 1 ; Wang, Yu 1 ; Li, Zitong 3 ; Guo, Baocheng 1 ; Merila, Juha 3 ;

作者机构： 1.Chinese Acad Sci, Inst Zool, Key Lab Zool Systemat & Evolut, Beijing, Peoples R China

2.Univ Chinese Acad Sci, Beijing, Peoples R China

3.Univ Helsinki, Fac Biol & Environm Sci, Organismal & Evolutionary Biol Res Programme, Ecol Genet Res Unit, Helsinki, Finland

4.Chinese Acad Sci, Ctr Excellence Anim Evolut & Genet, Kunming, Yunnan, Peoples R China

5.Beijing Acad Agr & Forestry Sci, Beijing Agrobiotechnol Res Ctr, Beijing, Peoples R China

关键词： expression divergence; Gasterosteidae; genetic parallelism; RNA-seq; SNP

期刊名称：MOLECULAR ECOLOGY （ 影响因子：6.185； 五年影响因子：6.801 ）

ISSN： 0962-1083

年卷期： 2020 年 29 卷 9 期

页码：

收录情况： SCI

摘要： The degree to which adaptation to similar selection pressures is underlain by parallel versus non-parallel genetic changes is a topic of broad interest in contemporary evolutionary biology. Sticklebacks provide opportunities to characterize and compare the genetic underpinnings of repeated marine-freshwater divergences at both intra- and interspecific levels. While the degree of genetic parallelism in repeated marine-freshwater divergences has been frequently studied in the three-spined stickleback (Gasterosteus aculeatus), much less is known about this in other stickleback species. Using a population transcriptomic approach, we identified both genetic and gene expression variations associated with marine-freshwater divergence in the nine-spined stickleback (Pungitius pungitius). Specifically, we used a genome-wide association study approach, and found that similar to 1% of the total 173,491 identified SNPs showed marine-freshwater ecotypic differentiation. A total of 861 genes were identified to have SNPs associated with marine-freshwater divergence, but only 12 of these genes have also been reported as candidates associated with marine-freshwater divergence in the three-spined stickleback. Hence, our results indicate a low degree of interspecific genetic parallelism in marine-freshwater divergence. Moreover, 1,578 genes in the brain and 1,050 genes in the liver were differentially expressed between marine and freshwater nine-spined sticklebacks, similar to 5% of which have also been identified as candidates associated with marine-freshwater divergence in the three-spined stickleback. However, only few of these (e.g., CLDND1) appear to have been involved in repeated marine-freshwater divergence in nine-spined sticklebacks. Taken together, the results indicate a low degree of genetic parallelism in repeated marine-freshwater divergence both at intra- and interspecific levels.

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