CHROMOSOMAL PHYLOGENY AND EVOLUTION IN THE GENUS MASTOMYS (MAMMALIA, RODENTIA)
CHROMOSOMAL PHYLOGENY AND EVOLUTION IN THE GENUS MASTOMYS (MAMMALIA, RODENTIA)
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DOI：
10.2307/1382333
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发表时间：
1995-02-01
影响因子：
1.7
通讯作者：
DUPLANTIER, JM
中科院分区：
文献类型：
--
作者：
BRITTONDAVIDIAN, J;CATALAN, J;DUPLANTIER, JM
非洲Mastomys属的染色体系统发育进行了澄清其分类地位，并估计染色体进化的相关性，在本属的多样化。本文报道了四种乳鼠（M. erythroleucus、M. huberti，M. natalensis和M. coucha）进行了比较，密切相关的非洲大鼠，Myomys daltoni和Praomys tullbergi，和三种欧洲鼠。系统发育树可分为两种拓扑结构，其中乳鼠属为单系或并系。可用等位酶数据的支序和表型分析清楚地表明，然而，Mastomys种形成一个密切相关的组，并同意本属的单系起源。Mastomys的染色体进化以七种不同类型的重排为特征，最常见的是臂间倒位。后者也参与种内，染色体多态性表明臂间倒位是一个经常性的事件，在本属的进化。然而，臂间倒位改变了基数，而不是二倍体数，这是一个标准，经常用来确定不同物种的Mastomys。这些观察结果表明，该属的染色体变化模式如下。改变二倍体数量的重排与主要物种形成事件同时发生，导致每个物种的二倍体数量不同，而随后的核型分歧主要是通过臂间倒位的积累进行的。
The chromosomal phylogeny of the African genus Mastomys was undertaken to clarify their taxonomic position and to estimate the relevance of chromosomal evolution in the diversification of this genus. Four species of Mastomys (M. erythroleucus, M. huberti, M. natalensis, and M. coucha) were compared to closely related African rats, Myomys daltoni and Praomys tullbergi, and to three species of European murids. The phylogenetic trees generated could be grouped into two topologies in which Mastomys was either monophyletic or paraphyletic. A cladistic and phenetic analysis of available allozymic data clearly showed, however, that Mastomys species form a closely related group and agreed with a monophyletic origin for this genus. Chromosomal evolution in Mastomys is characterized by seven different types of rearrangements, the most frequent being pericentric inversions. The latter also are involved in intraspecific, chromosomal polymorphisms suggesting that pericentric inversions are a recurrent event in the evolution of this genus. However, pericentric inversions modify the fundamental number, but not the diploid number, which is a criterion often used to identify the different species of Mastomys. These observations suggest the following pattern of chromosomal change in this genus. Rearrangements modifying the diploid number occurred at the same time as major speciation events resulting in different diploid numbers for each species whereas subsequent divergence of karyotypes proceeded mainly by accumulation of pericentric inversions.