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站在基因变异上的选择调解了极端爱好鱼类的融合进化

Kara Ryan¹, Ryan Greenway^2,3, Jake Landers¹

¹School of Biological Sciences, Washington State University, Pullman, Washington, USA.

Molecular ecology

|August 7, 2023

概括

鱼类独立地多次进化硫化物耐受性. 基因组分析揭示了在特定基因中的常态遗传变异上的选择驱动了这种融合进化,而不仅仅是共享的人口统计.

科学领域:

进化生物学进化生物学
基因组学就是基因组学.
毒理学毒理学毒理学

背景情况:

硫化 (H2S) 是一种有毒物质,影响线粒体的能量生产.
*Poecilia mexicana*物种复合体表现出多个种群中H2S耐受性的独立演变.
在H2S耐受性方面的表型趋同是显而易见的,但潜在的基因组基础仍然不清楚.

研究的目的:

调查Poecilia mexicana*中H2S耐受性的重复演变是否涉及类似的基因组变化.
为了确定与H2S耐受性和排毒相关的选择中的特定基因.

主要方法:

参与H2S过程和毒性候选基因的有针对性的捕获测序.
硫化物和非硫化物种群之间的序列变异的比较分析.
人口遗传学分析以推断人口历史和选择.

主要成果:

大多数候选基因显示人口结构是由人口统计学驱动的,而不是选择.
一个基因子集显示出显著的树不一致性,表明不同的进化.
两种与线粒体H2S排毒相关的异常基因在所有硫化物种群中显示出强烈的选择特征.
在这些选定的区域中,在硫化物种群中确定了长,共享的单元类型.

结论:

在 *Poecilia mexicana* 中,对H2S耐受性的趋同表型进化很可能是由站在基因变异上的选择驱动的.
参与线粒体硫化物排毒的特定基因似乎是选择的关键目标.
这项研究强调了适应性遗传变异在重复演化事件中的作用.

关键词:

波西里科科 (Poeciliidae) 是一个小鸟类的家族.适应适应适应适应融合进化的趋同.硫化是硫化的一种物质.人口基因组学人口基因组学

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