同配和性选择对基因流动的多基因障碍的影响

Parvathy Surendranadh, Himani Sachdeva
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引用次数: 0

摘要

同类交配和性选择在自然界非常普遍,通过建立和维持生殖隔离(RI),它们在物种形成过程中发挥着重要作用。然而,它们在 RI 期间对全基因组基因流抑制的贡献却很少被量化。在此,我们考虑了一种多基因 "神奇 "性状,这种性状在通过迁移连接的两个种群中进行分化选择,同时也是同配交配的基础,从而对一个或两个性别产生性选择。我们假定所有其他基因位点对任何基因位点的影响都可以通过有效迁移率来囊括,从而对单个性状位点的分化进行理论预测。我们的分析阐明了 "临界点"(以适应性分化的突然崩溃为特征)是如何出现的,以及同类交配何时可以改变迁移的临界水平,从而使分化崩溃。我们量化了生存能力和性选择对全基因组基因流动障碍的相对贡献,并讨论了这些贡献如何取决于现有的分化水平。我们的研究结果表明,有效迁移率是理解基因组分化的一种有用方法,即使在涉及多种相互作用的 RI 机制的情况下也是如此。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of assortative mating and sexual selection on polygenic barriers to gene flow
Assortative mating and sexual selection are widespread in nature and can play an important role in speciation, through the buildup and maintenance of reproductive isolation (RI). However, their contribution to genome-wide suppression of gene flow during RI is rarely quantified. Here, we consider a polygenic `magic' trait that is divergently selected across two populations connected by migration, while also serving as the basis of assortative mating, thus generating sexual selection on one or both sexes. We obtain theoretical predictions for divergence at individual trait loci by assuming that the effect of all other loci on any locus can be encapsulated via an effective migration rate, which bears a simple relationship to measurable fitness components of migrants and various early generation hybrids. Our analysis clarifies how `tipping points' (characterised by an abrupt collapse of adaptive divergence) arise, and when assortative mating can shift the critical level of migration beyond which divergence collapses. We quantify the relative contributions of viability and sexual selection to genome-wide barriers to gene flow and discuss how these depend on existing divergence levels. Our results suggest that effective migration rates provide a useful way of understanding genomic divergence, even in scenarios involving multiple, interacting mechanisms of RI.
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