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首页> 外文期刊>Genes & Genetic Systems >Timing of a mtDNA gene rearrangement and intercontinental dispersal of varanid lizards.
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Timing of a mtDNA gene rearrangement and intercontinental dispersal of varanid lizards.

机译:mtDNA基因重排和洲际蜥蜴的洲际传播的时间。

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The mitochondrial genomes of the Komodo monitor (Varanus komodoensis) and the Nile monitor (V. niloticus) were previously shown to have an extensive gene rearrangement. Here, we show that this gene arrangement widely occurs in varanid taxa originated from Africa, Asia and Australasia. Based on phylogenetic relationships of the varanids constructed using mitochondrial DNA sequences encoding the NADH dehydrogenase subunit 2 gene and seven flanking tRNA genes, we estimated their divergence times by the Bayesian method without assuming the molecular clock. The results suggested that the mitochondrial DNA gene rearrangement took place once in an ancestral varanid lineage in the Paleocene or earlier. Our results are more consistent with Cenozoic over-water dispersal of Southeast Asian varanids across the Indonesian Archipelago rather than the Cretaceous Gondwanan vicariance for the origin of Australasian varanids.
机译:先前显示,Komodo监测器(Varanus komodoensis)和Nile监测器(V. niloticus)的线粒体基因组具有广泛的基因重排。在这里,我们证明了这种基因排列广泛存在于源自非洲,亚洲和大洋洲的瓦拉尼德分类群中。基于使用编码NADH脱氢酶亚基2基因和7个侧翼tRNA基因的线粒体DNA序列构建的变体的系统发生关系,我们通过贝叶斯方法估计了它们的发散时间,而无需假设分子时钟。结果表明,线粒体DNA基因重排发生在古新世或更早的祖先变种世系中。我们的结果与东南亚变体在印度尼西亚群岛上的新生代水扩散相比,而不是白垩纪的冈瓦南变迁更符合澳大利亚变体的起源。

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