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The complex genetic architecture of male mate choice evolution between Drosophila species
Heredity ( IF 3.1 ) Pub Date : 2020-03-20 , DOI: 10.1038/s41437-020-0309-9
Michael P Shahandeh 1 , Thomas L Turner 1
Affiliation  

Mate choice behaviors are among the most important reproductive isolating barriers in many animals. Little is known about the genetic basis of reproductively isolating behaviors, but examples to date provide evidence that they can have a simple genetic basis. However, it is unclear if these results indicate that individual genes with large effects are common, or are instead due to ascertainment biases. Here, we present the results of a QTL mapping study for the most important behavioral isolating barrier between Drosophila simulans and D. sechellia: male mate choice. Our QTL results initially suggested that differences in male mate choice may be due to a couple loci with large effects. However, as we divided the largest-effect QTL using stable introgression strains, we found evidence of multiple interacting loci. We further find that separate regions of the genome control different aspects of male choice. Taken together, our results suggest that the genetic architecture of mate choice behavior, in this case, is more complex than QTL mapping suggested, highlighting potential challenges to future mapping studies. We discuss the implications of these results as they relate to signal–receiver coevolution, mate choice, and reproductive isolation.

中文翻译:

果蝇物种间雄性择偶进化的复杂遗传结构

配偶选择行为是许多动物最重要的生殖隔离障碍之一。关于生殖隔离行为的遗传基础知之甚少,但迄今为止的例子提供证据表明它们可以具有简单的遗传基础。然而,尚不清楚这些结果是否表明具有较大影响的单个基因是常见的,还是由于确定偏差。在这里,我们展示了模拟果蝇和 D. sechellia 之间最重要的行为隔离屏障的 QTL 映射研究的结果:雄性配偶选择。我们的 QTL 结果最初表明,雄性配偶选择的差异可能是由于一对具有较大影响的基因座所致。然而,当我们使用稳定的基因渗入菌株划分最大效应 QTL 时,我们发现了多个相互作用位点的证据。我们进一步发现基因组的不同区域控制着男性选择的不同方面。总之,我们的结果表明,在这种情况下,配偶选择行为的遗传结构比 QTL 映射更复杂,突出了未来映射研究的潜在挑战。我们讨论了这些结果的含义,因为它们与信号-接收器协同进化、配偶选择和生殖隔离有关。
更新日期:2020-03-20
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