从完整的线粒体基因组推断出的从古代淡水鱼类中出现的两栖动物的进化景观。

Evolutionary landscape of amphibians emerging from ancient freshwater fish inferred from complete mitochondrial genomes.

机构信息

College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.

出版信息

Biochem Biophys Res Commun. 2012 May 4;421(2):228-31. doi: 10.1016/j.bbrc.2012.03.141. Epub 2012 Apr 4.

DOI:10.1016/j.bbrc.2012.03.141

Abstract

It is very interesting that the only extant marine amphibian is the marine frog, Fejervarya cancrivora. This study investigated the reasons for this apparent rarity by conducting a phylogenetic tree analysis of the complete mitochondrial genomes from 14 amphibians, 67 freshwater fishes, four migratory fishes, 35 saltwater fishes, and one hemichordate. The results showed that amphibians, living fossil fishes, and the common ancestors of modern fishes are phylogenetically separated. In general, amphibians, living fossil fishes, saltwater fishes, and freshwater fishes are clustered in different clades. This suggests that the ancestor of living amphibians arose from a type of primordial freshwater fish, rather than the coelacanth, lungfish, or modern saltwater fish. Modern freshwater fish and modern saltwater fish were probably separated from a common ancestor by a single event, caused by crustal movement.

摘要

很有趣的是，唯一现存的海洋两栖动物是海洋蛙，也就是花臭蛙。本研究通过对 14 种两栖动物、67 种淡水鱼类、4 种洄游鱼类、35 种海水鱼类和 1 种半索动物的完整线粒体基因组进行系统发育树分析，探讨了这种明显稀有性的原因。结果表明，两栖动物、活化石鱼类和现代鱼类的共同祖先在系统发育上是分离的。一般来说，两栖动物、活化石鱼类、海水鱼类和淡水鱼类聚类在不同的分支中。这表明，活两栖动物的祖先是从一种原始的淡水鱼类中进化而来的，而不是腔棘鱼、肺鱼或现代海水鱼类。现代淡水鱼类和现代海水鱼类可能是由一次地壳运动引起的单一事件从一个共同祖先中分离出来的。