量化影响Arabidopsis thaliana基因RNA二次结构的SNP的演变
Galen T Martin1, Christopher J Fiscus1, Brandon S Gaut1
1Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697, USA.
Molecular biology and evolution
|June 10, 2025
概括
在Arabidopsis thaliana中改变RNA二次结构 (pcM) 的突变显示出减少的多样性和较低的频率. 选择对抗这些突变,特别是在未翻译的区域,影响基因表达.
科学领域:
- 人口遗传学 人口遗传学
- 分子进化是分子进化的过程.
- 结构 RNA 结构 RNA 结构
背景情况:
- 单链RNA分子通过分子内键形成二次结构.
- 改变RNA二次结构的突变可以产生表型效应,并受到自然选择的影响.
- 了解这些突变的进化动态对于基因功能研究至关重要.
研究的目的:
- 为了研究影响Arabidopsis thalianaRNA二级结构的突变的种群遗传学.
- 在A. thaliana基因中识别和量化对交换突变 (pcM).
- 评估PCM对核酸多样性,等位基因频率和基因表达的影响.
主要方法:
- 使用计算预测和经验数据识别具有潜在改变RNA二次结构的衍生单核酸多态 (SNP).
- 在1001个A. thaliana基因组中分析PCM的核酸多样性和等位基因频率.
- 人口建模以估计选择系数和全基因组关联研究的环境和表达相关性.
主要成果:
- 确定了8,469个多态 (~0.024%的转录站点) 作为潜在的PCM.
- 与非pcM SNPs相比,同名pcM SNPs的核酸多样性和等位基因频率较低13.4%.
- 在5'和3'未翻译区域检测到对pcm的选择.
- 含有pcM的等位基因在转录丰度中显示出 ~4%的显著平均减少.
- 在寒冷的环境中,pcM的频率更高,尽管非pcM等位基因也增加了.
结论:
- 在A. thaliana.未被翻译的区域对衍生PCM进行选择的证据.
- 在同名地点对衍生PCM进行选择的证据有限.
- pcM对基因表达有很小但很大的影响,可能受到环境因素的影响.
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