测试内部特异性交配特征和跨特异性交配障碍之间的基因组重叠
Leeban H Yusuf1, Sonia Pascoal2, Peter A Moran3
1Centre for Biological Diversity, School of Biology, University of St Andrews, Fife, United Kingdom.
Evolution letters
|December 16, 2024
概括
澳大利亚的交配信号的遗传基础显示,物种内部变异和分离它们的遗传障碍之间存在有限的重叠. 这表明,物种内特征进化和物种间的繁殖隔离有着不同的遗传途径.
科学领域:
- 进化生物学是进化的生物学.
- 人口基因组学是人口的基因组学.
- 规格研究研究 规格研究
背景情况:
- 跨物种的交配特征推动了物种之间的快速进化和繁殖隔离.
- 强化可以在二次接触期间加强交配障碍.
- 在跨物种屏障形成中,潜在的物种内特征变异的位置的作用尚不清楚.
研究的目的:
- 调查是否与交配特征的内部特异性变异相关的位置在形成跨物种交配障碍时被选择.
- 确定导致Teleogryllus oceanicus*中性信号 (歌曲,激素) 内部特异变化的遗传位置.
- 在*Teleogryllus oceanicus*和*Teleogryllus commodus*之间确定负责生殖隔离的候选位点.
主要方法:
- 种群基因组学方法使用在接触区的澳大利亚板姐妹物种 (*T. oceanicus*和 *T. commodus*) 的自然种群.
- 识别与T. oceanicus*中的广告歌和皮质碳化合物 (CHC) 激素的种内变异相关的位置.
- 基于两种物种之间高基分歧的候选跨物种屏障位点的识别.
主要成果:
- 在物种之间具有高等位基因分歧的基因被丰富为神经功能.
- 只有两个与CHC相关的基因与跨种候选屏障位点重叠;CHC位点显示出强大的选择性约束.
- 十个属性内与歌曲相关的基因显示了物种之间高度的遗传差异化,其中两种呈现出高基因组分歧.
结论:
- 种内交配特征的位置与种间屏障位置之间的有限重叠表明了不同的遗传架构.
- 生殖隔离的遗传基础可能不太依赖于基因的合作,在物种的性信号中驱动变异.
- 这些发现提供了对基因机制的洞察力,这些机制是物种化和生殖隔离的演变的基础.
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