在杆背中出现的De Novo突变率
Chaowei Zhang1, Kerry Reid1, Arthur F Sands1
1Area of Ecology & Biodiversity, School of Biological Sciences, The University of Hong Kong, Hong Kong, Hong Kong SAR.
Molecular biology and evolution
|August 30, 2023
概括
准确的 de novo 突变率被估计为九条脊椎鱼种群. 这些新的突变率 (μ) 值对这种鱼类的进化研究和种群遗传学研究进行了改进.
科学领域:
- 人口遗传学 人口遗传学
- 进化生物学 进化生物学
- 基因组学就是基因组学.
背景情况:
- 突变率是人口遗传学的关键参数,影响遗传多样性和人口推断.
- 对于野生生物来说,准确的新突变率估计很少,这阻碍了种群遗传研究.
- 九条的鱼 (Pungitius pungitius) 是生态和进化研究的一个重要模型.
研究的目的:
- 为了估计 de novo 突变速率 (μ) 在两个野生海洋种群的九脊.
- 为了提供更准确的突变速率,用于重新校准粘性鱼物种的进化时间表.
- 为鱼群遗传学研究提供一个有价值的资源.
主要方法:
- 使用了来自Pungitius pungitius种群的2代和3代家族血统.
- 对个体进行了深度全基因组再测序 (>50×覆盖率).
- 应用严格的过来识别来自高质量的参考基因组的生殖系突变.
主要成果:
- 在106个后代中发现了308个生殖基因突变.
- 估计的突变率为μ = 4.83 × 10−9和μ = 4.29 × 10−9每基每代.
- 观察到多达20%的突变共享的全-sibs,表明显著的父母马赛克主义.
结论:
- 估计的新突变率远远低于常用的替代率 (3.1倍).
- 使用这些新突变率进行重新校准,可显著增加鱼物种之间估计的分歧时间.
- 这些发现为种群遗传学和鱼和其他鱼类的进化研究提供了关键数据.
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