.png){kind=icon}
返回
Evolution at two time frames: Polymorphisms from an ancient singular divergence event fuel contemporary parallel evolution
.png){kind=icon}
OA
AI
DOI：10.1371/journal.pgen.1007796.png)
.png){kind=icon}
.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
When environments change, populations may adapt surprisingly fast, repeatedly and even at microgeographic scales. There is increasing evidence that such cases of rapid parallel evolution are fueled by standing genetic variation, but the source of this genetic variation remains poorly understood. In the salt-marsh beetle Pogonus chalceus, short-winged 'tidal' and long-winged 'seasonal' ecotypes have diverged in response to contrasting hydrological regimes and can be repeatedly found along the Atlantic European coast. By analyzing genomic variation across the beetles' distribution, we reveal that alleles selected in the tidal ecotype are spread across the genome and evolved during a singular and, likely, geographically isolated divergence event, within the last 190 Kya. Due to subsequent admixture, the ancient and differentially selected alleles are currently polymorphic in most populations across its range, which could potentially allow for the fast evolution of one ecotype from a small number of random individuals, as low as 5 to 15, from a population of the other ecotype. Our results suggest that cases of fast parallel ecological divergence can be the result of evolution at two different time frames: divergence in the past, followed by repeated selection on the same divergently evolved alleles after admixture. These findings highlight the importance of an ancient and, likely, allopatric divergence event for driving the rate and direction of contemporary fast evolution under gene flow. This mechanism is potentially driven by periods of geographic isolation imposed by large-scale environmental changes such as glacial cycles.
Keyword:
GENOMIC DIVERGENCE
LOCAL ADAPTATION
GENE-FLOW
ECOLOGICAL SPECIATION
POGONUS-CHALCEUS
BEETLE
HISTORY
DIFFERENTIATION
CONVERGENCE
POPULATIONS
AI总结
对已上传原文的论文进行重点信息的提取，主要内容包括：简要概述、研究摘要、背景介绍、关键亮点、图文解析、展望与总结。
期刊
IF:
3.7
论文数:
9.8K
被引数:
4.6W
机构
引用论文
分享收藏Repeated evolution of reproductive isolation in a marine snail: unveiling mechanisms of speciationOAAI
OAAI分享收藏Reduced graphene oxide–CdS nanocomposites with enhanced visible-light photoactivity synthesized using ionic-liquid precursors使用离子液体前体合成的具有增强的可见光光活性的还原氧化石墨烯-CdS纳米复合材料.png)
New J. Chem.
New J. Chem.IF0
PREAI
分享收藏
查看更多内容