功能性基因组多样性的演变在瓶期间
Flávia Schlichta1,2, Stephan Peischl2,3, Laurent Excoffier1,2
1Computational and Molecular Population Genetics (CMPG), Institute of Ecology and Evolution (IEE), University of Bern, Bern 3012, Switzerland.
Genome biology and evolution
|June 5, 2025
概括
具有有害突变的基因组区域可以形成多样性低谷,类似于在人口瓶或范围扩张期间的选择性扫描. 在低重组区的部分衰退突变更好地保持遗传多样性.
科学领域:
- 进化遗传学的进化遗传学
- 人口遗传学 人口遗传学
- 基因组学就是基因组学.
背景情况:
- 种群瓶和范围扩张对物种的遗传多样性产生重大影响.
- 中性变体可以在这些事件中固定,模仿选择性扫描.
- 之前的研究集中在中性变体上,使有害变体的动态不那么被探索.
研究的目的:
- 在瓶和范围扩张期间,研究具有有害变异的功能区域中的基因组多样性的动态.
- 确定有害突变的主导地位如何影响多样性模式.
- 为了比较具有有害突变的地区与中性地区的多样性水平.
主要方法:
- 模拟范围扩展作为连续创始人效应.
- 在具有有害突变的地区分析多样性低谷的形成和特性.
- 有害突变的主导程度的变化 (共主导,衰退,部分衰退).
- 考虑到重组率和选择系数的影响.
主要成果:
- 具有有害变异的功能区域可以形成类似于选择性扫描的多样性低谷.
- 低谷的数量随着共占优势的有害突变而不是衰退的有害突变而增加得更快.
- 与共主导或中立区域相比,在部分衰退突变的地区,遗传多样性下降的速度较慢.
- 这些效应在复合率较低的地区和具有中间选择系数的地区更为明显.
结论:
- 有害的突变,特别是部分衰退的突变,可以在人口规模变化期间塑造基因组多样性模式.
- 功能性,低重组区在范围扩张期间可能充当遗传多样性的储库,如果大多数有害突变是部分衰退的.
- 了解这些动态对于预测进化轨迹和保护遗传多样性至关重要.
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