Oakenfull E A, Clegg J B
Institute of Molecular Medicine, University of Oxford, Oxford, UK.
J Mol Evol. 1998 Dec;47(6):772-83. doi: 10.1007/pl00006436.
Sequences of the alpha1, alpha2 and theta globin genes from six equid species have been determined to investigate relationships within the genus Equus. Analyses using standard phylogenetic methods, or an approach designed to account for the effects of gene conversion between the alpha genes, gave broadly similar results and show that the horses diverged from the zebra/ass ancestor approximately 2.4 million years ago and that the zebra and ass species arose in a rapid radiation approximately 0.9 million years ago. These results from the alpha genes are corroborated by theta gene data and are in contrast to mitochondrial DNA studies of the phylogeny of this genus, which suggest a more gradual set of speciation events.
已测定了六种马科动物的α1、α2和θ珠蛋白基因序列，以研究马属动物之间的关系。使用标准系统发育方法或一种旨在考虑α基因之间基因转换影响的方法进行分析，得出了大致相似的结果，表明马大约在240万年前从斑马/驴的祖先中分化出来，而斑马和驴物种大约在90万年前通过快速辐射出现。来自α基因的这些结果得到了θ基因数据的证实，并且与该属系统发育的线粒体DNA研究形成对比，后者表明物种形成事件更为渐进。
