蕨类植物rpoC1内含子缺失及其分子进化速率
收稿日期: 2019-06-06
录用日期: 2020-03-24
网络出版日期: 2020-04-15
基金资助
国家自然科学基金(31770587)
Intron Loss and Molecular Evolution Rate of rpoC1 in Ferns
Received date: 2019-06-06
Accepted date: 2020-03-24
Online published: 2020-04-15
rpoC1基因编码RNA聚合酶β°亚基蛋白, 在转录过程中与DNA模板结合, 与β亚基形成的β-β°亚基复合体构成RNA合成的催化中心。以rpoC1基因为研究对象, 在贝叶斯因子大于20的条件下, 用HyPhy软件位点模型检测到3个正选择位点和541个负选择位点; 用PAML软件位点模型检测到10个正选择位点, 其中3个位点的后验概率超过99%。此外, 基于最大似然法构建64种蕨类植物的系统发育树, 结合HyPhy软件分析rpoC1基因的转换率、颠换率、转换率/颠换率、同义替换率、非同义替换率以及同义替换率/非同义替换率, 探讨rpoC1基因内含子丢失与分子进化速率的关系。结果表明, rpoC1基因内含子缺失对转换率、颠换率以及非同义替换率有一定影响。
彭阳, 苏应娟, 王艇 . 蕨类植物rpoC1内含子缺失及其分子进化速率[J]. 植物学报, 2020 , 55(3) : 287 -298 . DOI: 10.11983/CBB19105
The rpoC1 gene encodes the RNA polymerase β' subunit protein, which binds to the DNA template during transcription, and the β-β' subunit complex formed with the β subunit constitutes a catalytic center for RNA synthesis. In this study, the rpoC1 gene mutations in ferns were surveyed. With Bayes factor greater than 20, HyPhy site model detected 3 positive selection sites and 541 negative selection sites; the PAML site model detected 10 positive selection sites, three of which had posterior probabilities greater than 99%. In addition, a phylogenetic tree of 64 ferns was constructed based on the maximum likelihood method. We calculated the transition rate, transversion rate, transition rate/transversion rate, synonymous substitution rate, nonsynonymous substitution rate, and synonymous substitution rate/nonsynonymous substitution rate by HyPhy to analyze the relationship between intron loss of rpoC1 gene and molecular evolution rates. The results indicate that intron loss of the rpoC1 gene might play a role in its transition rate, transversion rate and nonsynonymous substitution rate in ferns.
Key words： rpoC1; intron; positive selection site; selection pressure
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