Mitochondrial DNA sequences of the Afro-Arabian spiny-tailed lizards (genus Uromastyx;: family Agamidae):: phylogenetic analyses and evolution of gene arrangements
Mitochondrial DNA sequences of the Afro-Arabian spiny-tailed lizards (genus Uromastyx;: family Agamidae):: phylogenetic analyses and evolution of gene arrangements
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DOI：
10.1111/j.1095-8312.2005.00485.x
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发表时间：
2005-06-01
影响因子：
1.9
通讯作者：
Kumazawa, Y
中科院分区：
文献类型：
--
作者：
Amer, SAM;Kumazawa, Y
对29个个体的线粒体DNA进行了约1.7kbp的测序，这些个体可归属于11个Uromastyx种或亚种和另外两个无鞭毛类。在Uocellata和Uornata中，谷氨酰胺和异亮氨酸tRNA基因之间有一个插入片段，可以折叠成稳定的茎环结构，而Uornata的插入片段还保留了与谷氨酰胺tRNA基因相似的序列。这证实了串联重复在重塑线粒体基因排列中的作用，并支持轻链复制的起点可以在线粒体基因组内重新定位的观点。分子系统发育从不同的树木建设方法一致放置非洲和阿拉伯类群在相互单系群，不包括U hardwickii居住在印度和巴基斯坦。与以往的研究基于形态，U macfadyeni没有聚类与形态相似的阿拉伯类群，这表明趋同进化负责形态相似性。Uromastyx分类群之间的分歧时间估计，连同地质和古生物学证据，表明Uromastyx无鞭毛类起源于始新世期间的中亚和殖民非洲后，其与欧亚大陆在中新世早期的连接。它们的辐射可能是由于自中新世中期以来北非的反复干旱化以及红海和东非裂谷扩张等地质事件而促进的。(c)2005 The Linnean Society of伦敦，Biological Journal of the Linnean Society，2005，85，247-260.
Approximately 1.7 kbp of mitochondrial DNA were sequenced from 29 individuals assignable to 11 Uromastyx species or subspecies and two other agamids. U ocellata and U ornata had an insertion between the glutamine and isoleucine tRNA genes, which could be folded into a stable stem-and-loop structure, and the insertion for U ornata additionally retained a sequence similar to the glutamine tRNA gene. This corroborates the role of tandem duplication in reshaping mitochondrial gene arrangements, and supports the idea that the origin of light-strand replication could be relocated within mitochondrial genomes. Molecular phylogeny from different tree-building methods consistently placed African and Arabian taxa in mutually monophyletic groups, excluding U hardwickii inhabiting India and Pakistan. Unlike previous studies based on morphology, U macfadyeni did not cluster with morphologically similar Arabian taxa, suggesting convergent evolution to be responsible for the morphological similarities. Divergence times estimated among the Uromastyx taxa, together with geological and palaeontological evidence, suggest that the Uromastyx agamids originated from Central Asia during the Eocene and colonized Africa after its connection with Eurasia in the early Miocene. Their radiation may have been facilitated by repeated aridification of North Africa since the middle Miocene, and geological events such as the expansion of the Red Sea and the East African Rift Valley. (c) 2005 The Linnean Society of London, Biological Journal of the Linnean Society, 2005, 85, 247-260.