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在Drosophila pseudoobscura中进行性选择,基因组进化和种群适应性

Stewart Leigh¹, Peter Thorpe^1,2, Rhonda R Snook³

¹Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews, Fife, UK.

Proceedings. Biological sciences

|April 1, 2025

概括

性选择对基因组进化和人口健康有重大影响. 它影响了基因变异和可移植元素的分布,特别是在染色体3和X染色体上.

科学领域:

进化遗传学的进化遗传学
人口基因组学是人口的基因组学.
性选择性选择性选择

背景情况:

性选择对基因组进化产生深远影响,并且可以通过清除有害突变或通过性冲突维持遗传负载等机制影响人口健康.
了解性选择如何塑造基因组变异对于理解人口健康和进化轨迹至关重要.

研究的目的:

调查性选择对基因组变异的影响,与人口健康相关.
分析经过实验操纵的性选择制度 (多夫制与一夫制) 对*Drosophila pseudoobscura*的基因组的影响.

主要方法:

经过实验,在不同的性选择制度下 (高层多夫多妻制和严格一夫一妻制) 经历了大约200代的 *Drosophila pseudoobscura* 种群的进化.
基于个体的全基因组测序.
使用核酸多样性 (π),固定指数 (Fst) 和重组率等措施分析基因组变异.

主要成果:

选择的特征主要定位在第三个和X染色体上,表明非均的基因组效应.
虽然总体突变负载相似,但在线和染色体之间观察到健康效应分布的显著变化.
在交配制度之间,可转移元素的分布有所不同,在一夫一妻制系中检测到的负载更高,这表明与性冲突和净化选择的复杂相互作用.

结论:

性选择,结合性冲突和净化选择,复杂地塑造了基因组进化,特别是在染色体3和性染色体上.
这项研究揭示,性选择以复杂的方式驱动染色体之间的分歧,不仅仅是清除有害的位置.

关键词:

健身效应的分布健身影响的分布突变负载的变化负载性冲突是性冲突.性选择性选择性选择

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