Four new mitochondrial genomes and the increased stability of evolutionary trees of mammals from improved taxon sampling
Four new mitochondrial genomes and the increased stability of evolutionary trees of mammals from improved taxon sampling
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DOI：
10.1093/oxfordjournals.molbev.a004031
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发表时间：
2002-12-01
影响因子：
10.7
通讯作者：
Penny, D
中科院分区：
文献类型：
--
作者：
Lin, YH;McLenachan, PA;Penny, D
我们已经测序了四个新的线粒体基因组，以提高胎盘哺乳动物的树的稳定性;他们是两个食虫动物（裸腹，Echinosorex gymnurus和台湾鼩 Soriculus fumidus）;台湾小马蹄蝠（菊头蝠monoceros）;和新西兰海狗（Arctocephalus forsteri）。刺猬序列（刺猬）的修订也有报道。这五种动物都属于真兽目哺乳动物的Laurasiatheria类群。在这个新的数据集上，刺猬和它的亲戚，gymnure，有一个强烈的趋势，与其他的劳亚兽纲食虫动物（鼹鼠和鼩）。为了从这些数据中量化树的稳定性，我们定义，基于核序列，一个主要的四路分裂在Laurasiatherians。这种（[Xenarthra，Afrotheria]，[Laurasiatheria，Suprapimates]）分裂也可以在线粒体基因组中使用蛋白质编码或RNA（rRNA和tRNA）数据集发现。线粒体和核衍生的树的高度相似性允许从独立的数据集的树的稳定性的定量估计，从三重马尔可夫分析检测。有胎盘哺乳动物的突变过程中有显着的变化，被忽略了目前的树程序。在我们的定量结果的基础上，我们希望哺乳动物的进化树能很快得到解决，这将使其他问题得到解决。
We have sequenced four new mitochondrial genomes to improve the stability of the tree for placental mammals; they are two insectivores (a gymnure, Echinosorex gymnurus and Formosan shrew Soriculus fumidus); a Formosan lesser horseshoe bat (Rhinolophus monoceros); and the New Zealand fur seal (Arctocephalus forsteri). A revision to the hedgehog sequence (Erinaceus europaeus) is also reported. All five are from the Laurasiatheria grouping of eutherian mammals. On this new data set there is a strong tendency for the hedgehog and its relative, the gymnure, to join with the other Laurasiatherian insectivores (mole and shrews). To quantify the stability of trees from this data we define, based on nuclear sequences, a major four-way split in Laurasiatherians. This ([Xenarthra, Afrotheria], [Laurasiatheria, Supraprimates]) split is also found from mitochondrial genomes using either protein-coding or RNA (rRNA and tRNA) data sets. The high similarity of the mitochondrial and nuclear-derived trees allows a quantitative estimate of the stability of trees from independent data sets, as detected from a triplet Markov analysis. There are significant changes in the mutational processes within placental mammals that are ignored by current tree programs. On the basis of our quantitative results, we expect the evolutionary tree for mammals to be resolved quickly, and this will allow other problems to be solved.