Genomic and phenotypic consequences of two independent secondary contact zones between allopatric lineages of the anadromous ice goby Leucopsarion petersii
Genomic and phenotypic consequences of two independent secondary contact zones between allopatric lineages of the anadromous ice goby Leucopsarion petersii
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溯河产卵冰虾虎鱼 Leucopsarion petersii 异域谱系之间两个独立次级接触区的基因组和表型后果
DOI：
10.1038/s41437-019-0239-6
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发表时间：
2020
期刊：
影响因子：
3.8
通讯作者：
Kikuchi K
中科院分区：
文献类型：
--
作者：
Hirase S;Kokita T;Nagano JA;Kikuchi K
遗传和表型分析的独立的次级接触区之间的某些对不同的人群提供了强大的机会，以评估是否有不同的环境背景的后果。种群的冰虾虎鱼Leucopsarion petersii分布在整个日本列岛，包括遗传和表型分歧组在日本海和太平洋。特别是，日本海的种群比太平洋的种群有更大的体型和椎骨数量。在此，我们进行了两个独立的次级接触区的基因型和表型的综合分析，并调查其后果。群体遗传分析显示，相对于两个次级接触区的核基因组的小混合物的线粒体基因组的任一谱系的不对称渐渗。在表型分析中，脊椎数目清楚地解释了核基因组祖先在两个次级接触区，而身体大小没有，这表明一点渗入的核基因调节身体大小。事实上，我们观察到一个候选基因，神经肽Y（NPY），这可能控制身体大小的冰虾虎鱼的偏见渐渗。此外，渐渗群体的体型变化可能会影响线粒体基因组在这些区域的渐渗模式。总的来说，我们的研究结果表明，二次接触的基因组和表型的后果在海洋可变环境中变化。
Genetic and phenotypic analyses of independent secondary contact zones between certain pairs of divergent populations offer powerful opportunities to assess whether the consequences vary with different environmental backgrounds. Populations of the ice gobyLeucopsarion petersiiare distributed throughout the Japanese archipelago and comprise genetically and phenotypically divergent groups in the Japan Sea and the Pacific Ocean. In particular, populations in the Japan Sea have a larger body size and numbers of vertebrae than those in the Pacific Ocean. Herein, we performed integrated analyses of genotypes and phenotypes of two independent secondary contact zones and investigated their consequences. Population genetic analyses revealed asymmetric introgression of the mitochondrial genome of either lineage relative to little admixture of nuclear genomes in both secondary contact zones. On phenotype analyses, vertebral numbers were clearly explained by nuclear genomic ancestry in both secondary contact zones, whereas body size was not, suggesting that a little introgression of nuclear genes regulates body size. Actually, we observed biased introgression of a candidate gene, neuropeptide Y (NPY), which potentially controls body size in the ice goby. Moreover, the body size changes in the introgressed populations possibly affect the introgression patterns of mitochondrial genomes across these zones. Collectively, our results demonstrated that genomic and phenotypic consequences of secondary contact varied in marine variable environments.