基因托普拉斯 莱什曼尼亚菌种的基因组 在强烈的净化选择下
Evgeny S Gerasimov1,2, Tatiana S Novozhilova1, Sara L Zimmer3
1Department of Molecular Biology, Lomonosov Moscow State University, 119234 Moscow, Russia.
Tropical medicine and infectious disease
|August 25, 2023
概括
莱什马尼亚的kinetoplast maxicircle基因组表现出高的进化速率,但仍然具有功能. 同义替代占主导地位,大多数基因都表现出净化选择,这表明尽管快速突变积累,功能约束仍然存在.
科学领域:
- 分子生物学分子生物学
- 进化遗传学 进化遗传学
- 寄生虫学的寄生虫学
背景情况:
- 包括类动物在内的原生体基因组在某些区域显示基因组不稳定性和快速进化.
- 试类动物的kinetoplast基因组,包括大圆和小圆,可以显示出高的替代率.
- 之前的研究表明,实验室进化可以导致基因细胞细胞基因组功能障碍和基因组组件的损失.
研究的目的:
- 估计自然Leishmania物种线粒体和核基因组区域的进化速率.
- 分析同义词和非同义词的替代,以了解进化动态.
- 为了研究尽管突变率很高,但kinetoplast最大循环基因的功能约束.
主要方法:
- 来自自然Leishmania种群的线粒体和核DNA的比较基因组分析.
- 使用同义 (dN) 和非同义 (dS) 替代分析估计进化速率.
- 对作用于最大圆的编码区域的选择压力的评估.
主要成果:
- 奇纳托普拉斯最大圆的编码区域是线粒体和核基因组中最可变的区域之一.
- 同义词的替换在最大圆的编码区域中显著超过非同义词的替换.
- 大多数maxicircle基因表现出净化选择的签名,表明其功能重要性.
结论:
- 尽管突变率很高,但Leishmania最大圈在自然种群中保持了功能.
- 同义替代和净化选择的占主导地位表明突变和功能约束之间的平衡.
- 这些发现提供了关于Leishmania中必不可少的kinetoplast组件的进化稳定性的见解.
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