Interordinal relationships and timescale of eutherian evolution as inferred from mitochondrial genome data
Interordinal relationships and timescale of eutherian evolution as inferred from mitochondrial genome data
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DOI：
10.1016/s0378-1119(00)00427-3
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发表时间：
2000-12-23
期刊：
影响因子：
3.5
通讯作者：
Hasegawa, M
中科院分区：
文献类型：
--
作者：
Cao, Y;Fujiwara, M;Hasegawa, M
利用最大似然法对哺乳动物线粒体基因组的最新序列数据进行了广泛的系统发育分析，以解决真兽目进化中的深分支问题。在哺乳动物树的分歧时间估计的线粒体蛋白质校准与多个参考宽松的分子钟。一个翼手目/真蹄亚目（即蝙蝠/鼹鼠）的分支和该分支与Fereuungulata（食肉目+奇蹄目+鲸偶蹄目）的密切关系被再次证实具有高度的统计学意义。然而，一个单系的Fereuungulata相对于翼手目/Eulipotyphla分支的支持是脆弱的，我们认为，三个分支之间的食肉目，奇蹄目，鲸目和翼手目/Eulipotyphla相继发生在很短的时间内，估计约77万年BP。翼手目/Eulipotyphla的分歧估计大致与第三纪的边界（6500万年前）相吻合。啮齿目的单系性，Lagomorpha/啮齿目分支（传统上称为Glires），和Afrotheria/Xenarthra分支是首选替代关系，但这些分支的支持不足以排除其他可能性。虽然线粒体基因组数据的分析有力地支持了真兽目的几个超目分类群，但从目前可用的数据来看，真兽目树最深部分的分支顺序仍然不明确。(C)2000 Elsevier Science B. V.保留所有权利。
Extensive phylogenetic analyses of the updated sequence data of mammalian mitochondrial genomes were carried out using the maximum likelihood method in order to resolve deep branchings in eutherian evolution. The divergence times in the mammalian tree were estimated by a relaxed molecular clock of the mitochondrial proteins calibrated with multiple references. A Chiroptera/Eulipotyphla (i.e, bat/mole) clade and a close relationship of this clade to Fereuungulata (Carnivora + Perissodactyla + Cetartiodactyla) were reconfirmed with high statistical significance. However, a support for a monophyly of Fereuungulata relative to the Chiroptera/Eulipotyphla clade was fragile, and we suggest that the three branchings among Carnivora, Perissodactyla, Cetartiodactyla and Chiroptera/Eulipotyphla occurred successively in a short time period, estimated to be approximately 77 Myr BP. The Chiroptera/Eulipotyphla divergence was estimated to roughly coincide with the Cretaceous-Tertiary boundary (65 Myr BP). The monophyly of Rodentia, the Lagomorpha/Rodentia clade (traditionally called Glires), and the Afrotheria/Xenarthra clade were preferred over alternative relationships, but the supports of these clades were not strong enough to exclude other possibilities. Although several super-order taxa of eutherians were strongly supported by the analyses of the mitochondrial genome data, the branching order in the deepest part of the eutherian tree remained ambiguous fi om the data presently available. (C) 2000 Elsevier Science B.V. All rights reserved.