The mitochondrial genomes of the iguana (Iguana iguana) and the caiman (Caiman crocodylus):: implications for amniote phylogeny
The mitochondrial genomes of the iguana (Iguana iguana) and the caiman (Caiman crocodylus):: implications for amniote phylogeny
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DOI：
10.1098/rspb.2000.1402
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发表时间：
2001-03-22
影响因子：
4.7
通讯作者：
Arnason, U
中科院分区：
文献类型：
--
作者：
Janke, A;Erpenbeck, D;Arnason, U
为了探讨四足动物进化的系统发育问题，对两种爬行动物，普通鬣蜥（Iguana iguana）和凯门鳄（Caiman crocodylus）的线粒体全基因组进行了测序。这两个物种的加入允许使用数据集来分析爬行动物的关系，而不是只包括快速进化的物种。鳄鱼的线粒体基因组似乎比其他脊椎动物进化的速度更快。来自35个线粒体基因组的2889个氨基酸位点的系统发育分析支持鸟类与鳄鱼的关系，但不支持血热菌假说（鸟类和哺乳动物代表姐妹群）。这些分析证实了海龟是鸟类-鳄鱼分支的基础的观点。龟类的这种位置使双孔类并系。有鳞动物的起源估计在2.94亿年前，海龟的起源估计在2.78亿年前。使用额外的外类群对哺乳动物关系的系统发育分析证实了有袋动物假说，该假说将单孔目动物和有袋动物排除在真兽目动物之外。
The complete mitochondrial genomes of two reptiles, the common iguana (Iguana iguana) and the caiman (Caiman crocodylus), were sequenced in order to investigate phylogenetic questions of tetrapod evolution. The addition of the two species allows analysis of reptilian relationships using data sets other than those including only fast-evolving species. The crocodilian mitochondrial genomes seem to have evolved generally at a higher rate than those of other vertebrates. Phylogenetic analyses of 2889 amino-acid sites from 35 mitochondrial genomes supported the bird-crocodile relationship, lending no support to the Haematotherma hypothesis (with birds and mammals representing sister groups). The analyses corroborated the view that turtles are at the base of the bird-crocodile branch. This position of the turtles makes Diapsida paraphyletic. The origin of the squamates was estimated at 294 million years (Myr) ago and that of the turtles at 278 Myr ago. Phylogenetic analysis of mammalian relationships using the additional outgroups corroborated the Marsupionta hypothesis, which joins the monotremes and the marsupials to the exclusion of the eutherians.