优势的有利逆转在波动的杀虫剂选择下保持了大效应的耐药多态性
Marianthi Karageorgi1, Anastasia S Lyulina2,3, Mark C Bitter2
1Department of Biology, Stanford University, Stanford, CA, USA. mkarag@stanford.edu.
Nature ecology & evolution
|September 15, 2025
概括
优势的有益逆转稳定了遗传变异. 在Drosophila中,当有益时,耐药基因是主导的,当有害时是衰退的,在波动的选择下保持昆虫剂耐药性多态.
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
- 分子进化的分子进化.
背景情况:
- 大影响的遗传变异在自然种群中很常见,但面临着定向选择.
- 主导逆转 (当有利时具有主导性,当有害时具有衰退性) 是在波动选择下稳定多态的理论机制.
- 对逆转主导地位的经验证据是有限的,因为需要在现场测量适应性和选择性.
研究的目的:
- 调查优势的有益逆转在维持大效应的健身多态化中的作用.
- 通过在Drosophila melanogaster中的Ace locus中的杀虫剂耐药性多态体来测试这个假设.
- 为在波动选择下稳定遗传变异提供经验证据.
主要方法:
- 综合实验室和大规模现场中宇宙实验.
- 在实验环境中操纵的杀虫剂暴露.
- 利用数学建模来分析健身和选择动态.
- 在不同的农药条件下测量了Ace等位基因的支配性和适应性效应.
主要成果:
- 抗性Ace等位基因在富含农药的环境中表现出占主导地位的好处.
- 耐药ACE等位基因的适应性成本在没有农药的环境中是衰退的.
- 暂时波动的杀虫剂选择诱导了ACE等位基因附近的染色体尺度基因组扰动.
结论:
- 优势的有利逆转可能有助于维持功能性遗传变异.
- 这种机制稳定了等位基因的大量频率波动.
- 这些发现影响了我们对在波动选择下远程基因组变异模式的理解.
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