生物学杂志

• 研究报告 • 上一篇    下一篇

COX I蛋白质分子确定“寒武纪生物大爆发”时期物种分歧时间

  

  1. 同济大学化学系, 上海,200092
  • 出版日期:2016-02-18 发布日期:2016-02-18
  • 通讯作者: 李可群(1968-), 男, 湖南长沙人,同济大学化学系讲师。研究方向:分子遗传进化。Tel: 021-52848695; Email: likequn@tongji.edu.cn

 
Resolving Metazoan Phyla Divergence Times
During Cambrian Explosion by COX I Protein molecules

  1. Department of Chemistry, Tongji University, Shanghai,200092
  • Online:2016-02-18 Published:2016-02-18

摘要:  

使用经典分子钟分子COX I蛋白质和本文作者提出的同源生物分子绝对进化速率计算公式,对“寒武纪生物大爆发”期间的一些主要动物门类分歧时间进行了计算。结果表明:原口动物和后口动物分歧时间为5.60亿年前, 后口动物中的头索动物、尾索动物、半索动物和棘皮动物的分歧时间分别为5.36亿年前、5.40亿年前、5.48亿年前和5.45亿年前。该结果与化石记录基本符合,明显好于现有分子钟理论得到的结果。本文为研究生物起源和演化提供了一种的新的思路和方法。

Abstract:  

By using the equation for resolving absolute evolutionary rates of biological molecules provided by author and the classic “molecular clock” Cytochrome oxidase subunit I (COX I) protein molecules, the metazoan phyla divergence times during Cambrian explosion were obtained. These results show that Protostomia and Deuterostomia separated at 560 million years (myrs ) ago. The phyla divergence times of four major deuterstomia: Cephalochordata, Urochordata, Hemichordata and Echinodermata are 536 myrs ago, 540myrs ago, 548myrs ago and 545myrs ago respectively. These divergence times agree well with fossil records, and are obviously better than those obtained by other current molecule clock methods. Our method may provide a new way to understandorigins and evolution of creatures.