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Polygenic adaptation contributes to the invasive success of the Colorado potato beetle

文献类型： 外文期刊

作者： Yang, Fangyuan 1 ; Crossley, Michael S. 3 ; Schrader, Lukas 4 ; Dubovskiy, Ivan M. 5 ; Wei, Shu-Jun 2 ; Zhang, Runzhi 1 ;

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

2.Beijing Acad Agr & Forestry Sci, Inst Plant & Environm Protect, Beijing, Peoples R China

3.Univ Delaware, Dept Entomol & Wildlife Ecol, Newark, DE USA

4.Univ Munster, Inst Evolut & Biodivers, Munster, Germany

5.Novosibirsk State Agr Univ, Lab Biol Plant Protect & Biotechnol, Novosibirsk, Russia

6.Univ Chinese Acad Sci, Coll Life Sci, Beijing, Peoples R China

关键词： Colorado potato beetle; environment adaptation; genetic paradox; invasive species; population genomics

期刊名称：MOLECULAR ECOLOGY （ 影响因子：6.622； 五年影响因子：6.895 ）

ISSN： 0962-1083

年卷期： 2022 年 31 卷 21 期

页码：

收录情况： SCI

摘要： How invasive species cope with novel selective pressures with limited genetic variation is a fundamental question in molecular ecology. Several mechanisms have been proposed, but they can lack generality. Here, we addressed an alternative solution, polygenic adaptation, wherein traits that arise from multiple combinations of loci may be less sensitive to loss of variation during invasion. We tested the polygenic signal of environmental adaptation of Colorado potato beetle (CPB) introduced in Eurasia. Population genomic analyses showed declining genetic diversity in the eastward expansion of Eurasian populations, and weak population genetic structure (except for the invasion fronts in Asia). Demographic history showed that all populations shared a strong bottleneck about 100 years ago when CPB was introduced to Europe. Genome scans revealed a suite of genes involved in activity regulation functions that are plausibly related to cold stress, including some well-founded functions (e.g., the activity of phosphodiesterase, the G-protein regulator) and discrete functions. Such polygenic architecture supports the hypothesis that polygenic adaptation and potentially genetic redundancy can fuel the adaptation of CPB despite strong genetic depletion, thus representing a promising general mechanism for resolving the genetic paradox of invasion. More broadly, most complex traits based on polygenes may be less sensitive to invasive bottlenecks, thus ensuring the evolutionary success of invasive species in novel environments.

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