高的生殖线突变率,但不是极端的人口爆发,影响基石珊瑚捕食者的遗传多样性
Iva Popovic1, Lucie A Bergeron2, Yves-Marie Bozec1
1School of the Environment, The University of Queensland, St Lucia, Queensland, Australia.
PLoS genetics
|February 12, 2024
概括
刺冠海星表现出高突变率,挑战了遗传多样性和种群规模之间的联系. 这项研究揭示了突变率,而不是人口波动,可能会推动海洋无脊椎动物的多样性.
科学领域:
- 进化生物学是进化的生物学.
- 海洋无脊椎动物基因组学
- 人口遗传学 人口遗传学
背景情况:
- 列文廷悖论描述了遗传多样性 (π) 和人口普查人口大小 (Nc) 之间缺乏线性缩放的情况.
- 海洋无脊椎动物表现出 π 和 Nc 之间的极端不匹配,突变速率的影响不清楚.
- 了解突变率对于解释这些种群中的遗传多样性至关重要.
研究的目的:
- 为了估计海洋无脊椎动物的生殖基因突变率 (μ),请参阅*Acanthaster. 太阳星* (棘冠的海星).
- 在人口普查人口大小 (Nc) 波动的群体中调查遗传多样性 (π) 的决定因素.
- 在海洋无脊椎动物中调和 Lewontin 的悖论.
主要方法:
- 14个*A. cf.的父子三组的全基因组测序. 太阳系*. 太阳系*.
- 在大堡礁人口大小 (Nc) 的实证估计.
- 对突变率,有效种群大小 (Ne) 和Nc波动的联合分析.
主要成果:
- *A. cf. 的平均生殖基因突变率 (μ). 太阳系*是9.13×10−9个基因突变,每个基因位点每代.
- 这种突变率超过了对其他无脊椎动物的估计,并且与脊椎动物的突变率更接近.
- 低有效人口规模 (Ne) 和Ne/Nc比率表明,人口爆发对长期遗传多样性的影响有限.
结论:
- 在海洋无脊椎动物中,由于有效种群规模减少和生成时间缩短,突变率可能会升高.
- 这一发现对理解高突变负载和遗传多样性模式有重大影响.
- 这项研究为海洋种群中莱文顿悖论提供了新的解释.
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