微小的当代重组变化及其适应性影响在适应性分离的鱼中
Vrinda Venu1,2, Enni Harjunmaa3,4, Andreea Dreau3,5
1Friedrich Miescher Laboratory of the Max Planck Society, Tübingen, Germany. vrinda@lanl.gov.
Nature ecology & evolution
|June 5, 2024
概括
重组率有所不同,影响了适应性分歧. 在鱼中,杂交物表现出抑制的重组,这表明它在维持不同的种群和潜在地减少混合群体的健康方面的作用.
科学领域:
- 进化遗传学的进化遗传学
- 基因组学就是基因组学.
- 人口遗传学 人口遗传学
背景情况:
- 重组率在基因组和种群中高度可变,但它们对适应性分歧的影响尚不清楚.
- 了解重组变异对于解释种群如何适应和分离至关重要.
研究的目的:
- 在适应性分化的海洋和淡水鱼种群中描述细度重组景观.
- 确定影响重组率变化的因素及其在生殖隔离中的作用.
主要方法:
- 大型核家族的全基因组测序在三脊背动物中.
- 构建海洋,淡水和混合物个体的高分辨率重组地图 (3.8 kb).
- 重组率的量化和驱动变化的因素分析.
主要成果:
- 观察到显著的性别特异性重组差异 (异质基性) 和生态型特异性变异.
- 杂交物表现出大量的重组抑制,影响了整体地图长度和个别位置.
- 在适应位置内和适应位置之间较低的重组率表明在链接的基因"盒子"上进行选择,重组剂的适应性降低.
结论:
- 在混合体中被破坏的cis作用重组修饰剂的分歧可能有助于维持种群之间的适应差异.
- 在杂交动物中,重组抑制可能作为一种加强生殖隔离的机制.
- 这些发现突出了重组在塑造适应性分歧和物种化的作用.
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