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首页> 外文期刊>Evolution Letters >Genomic divergence landscape in recurrently hybridizing Chironomus sister taxa suggests stable steady state between mutual gene flow and isolation
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Genomic divergence landscape in recurrently hybridizing Chironomus sister taxa suggests stable steady state between mutual gene flow and isolation

机译：杂交杂交的基因组分歧景观患者分类患者的矛盾表明，互基因流动与隔离之间的稳定状态

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Divergence is mostly viewed as a progressive process often initiated by selection targeting individual loci, ultimately resulting in ever increasing genomic isolation due to linkage. However, recent studies show that this process may stall at intermediate stable equilibrium states without achieving complete genomic isolation. We tested the extent of genomic isolation between two recurrently hybridizing nonbiting midge sister taxa, Chironomus riparius and Chironomus piger, by analyzing the divergence landscape. Using a principal component-based method, we estimated that only about 28.44% of the genomes were mutually isolated, whereas the rest was still exchanged. The divergence landscape was fragmented into isolated regions of on average 30 kb, distributed throughout the genome. Selection and divergence time strongly influenced lengths of isolated regions, whereas local recombination rate only had minor impact. Comparison of divergence time distributions obtained from several coalescence-simulated divergence scenarios with the observed divergence time estimates in an approximate Bayesian computation framework favored a short and concluded divergence event in the past. Most divergence happened during a short time span about 4.5 million generations ago, followed by a stable equilibrium between mutual gene flow through ongoing hybridization for the larger part of the genome and isolation in some regions due to rapid purifying selection of introgression, supported by high effective population sizes and recombination rates.? 2020 The Authors. Evolution Letters published by Wiley Periodicals LLC on behalf of Society for the Study of Evolution (SSE) and European Society for Evolutionary Biology (ESEB).
机译：发散主要被视为通常通过选择各个基因座来发起的渐进过程，最终导致导致由于连杆引起的基因组分离增加。然而，最近的研究表明，该过程可能在中间稳定的平衡状态下停滞，而不实现完全的基因组分离。通过分析分解景观，我们测试了两次常规杂交非杂交的中间姐妹分类群，互相同杂交的中间姐妹分类群的基因组分离程度。利用基于主成分的方法，我们估计只有约28.44％的基因组被互相隔离，而其余部分仍然交换。分布在整个基因组的平均30 kB的分离区域中分散到分离区域。选择和分歧时间强烈影响孤立地区的长度，而局部重组率仅产生轻微的影响。从多个聚结 - 模拟分歧场景获得的分歧时间分布与观察到的差异时间估计在近似贝叶斯计算框架中的估计有利于过去的短暂和结论的分歧事件。在短时间内发生的大部分发生了大约450万代，随后通过持续杂交，通过对基因组的较大部分和由于快速净化的血栓选择而分离的较大部分的较大杂交，由高效率的快速净化人口尺寸和重组率。？ 2020作者。 Wiley期刊LLC发布的演变信函代表进化（SSE）和欧洲进化生物学学会研究（ESEB）。

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