一种土生土长的陆地同类动物 (Trichoniscus pusillus) 的分子进化模式
Emily Yarbrough1,2, Christopher Chandler1
1Department of Biological Sciences, State University of New York at Oswego, Oswego, NY, United States of America.
PeerJ
|July 29, 2024
概括
性悖论仍然是一个,但这项研究表明无性繁殖可能会在长期的进化时间尺度上积累有害突变. 由于对新突变的更有效的净化选择,性繁殖可能会受到青.
科学领域:
- 进化生物学 进化生物学
- 遗传学 是一个遗传学.
- 生殖策略 生殖策略
背景情况:
- 性悖论质疑为什么性繁殖尽管付出了代价,但仍然存在.
- 无性生殖预计会受到青,但性生殖是常见的.
- 假设包括利基区分,红皇后假设和突变积累.
研究的目的:
- 为了研究无性与性陆地同足动物的突变积累.
- 为了比较Trichoniscus pusillus* (无性/性) 和Hyloniscus riparius* (性) 的分子进化模式.
- 为了测试无性血统中低效净化选择的假设.
主要方法:
- 对野生捕获的同类动物进行了性别比率调查并收集了RNA-seq数据.
- 分析了蛋白质编码基因中的分子进化在物种内部和物种间的模式.
- 非同义词与同义词替代 (dN/dS) 和SNP (pN/pS) 的计算比例.
主要成果:
- 确认的 *T. pusillus* 无性/三胞胎种群和 *H. riparius* 性/双胞胎种群.
- *T. pusillus* 呈现出更高的异性和SNP密度,这表明其起源是杂交的.
- 没有总体证据表明无效的净化选择 (dN/dS,总体PN/pS) 在无性*T. pusillus*.
结论:
- 最近无性 *T. pusillus* 的突变显示了较高的pN/pS比率,支持在长时间内不那么有效的净化选择.
- 这种同类足系统是研究性和无性繁殖的进化权衡的宝贵模型.
- 低效的净化选择可能是维持自然性繁殖的关键因素.
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