A New Cytotype of the Iranian House Mouse, Mus musculus Linnaeus, 1758 (Rodentia: Muridae), in Birjand Region, Eastern Iran: Implications for the Evolution of Sex-Autosome Translocations

Iranian Journal of Animal Biosystematics Pub Date : 2015-09-24 DOI:10.22067/ijab.v12i1.48278

Farahnaz - Molavi, J. Darvish, F. Haddad, M. Matin

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引用次数: 1

Abstract

The highly conserved morphology and chromosomal structures of house mouse, Mus musculus, provides a good model for chromosomal studies. Sex-autosome translocations is one of the rarest chromosomal rearrangements among mammals and therefore sex-autosome translocations has been offered as accurate taxonomic markers to identify species with similar morphological traits. In this study, we described the outcome of a comprehensive cytogenetic survey of the house mouse, Mus musculus, in the eastern Iran using G banding method. Interestingly, results showed the presence of a new cytotype of X-autosome translocation of house mouse which was found in 18 specimens of Birjand region in the eastern Iran. Larger size of choromosomal translocation was observed in Chromosome X. We used karyotype asymmetry method as a powerful statistical parameter to extract coefficient of variation of chromosome length. Based on the data of this study, the results, Birjand population did not show asymmetry in all Asymmetry indexes (AI, DI, As%, A, A2, A1 and Syi%), and this result confirmed translocations in Birjands' chromosomes as well.

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伊朗东部Birjand地区伊朗家鼠，musmusculus Linnaeus, 1758(啮齿类:鼠科)的一种新细胞型:性别常染色体易位的进化意义

家鼠的形态和染色体结构高度保守，为染色体研究提供了良好的模型。性常染色体易位是哺乳动物中最罕见的染色体重排之一，因此，性常染色体易位已被提供作为准确的分类标记来识别具有相似形态特征的物种。在这项研究中，我们描述了在伊朗东部使用G带法对家鼠小家鼠进行全面细胞遗传学调查的结果。有趣的是，结果显示在伊朗东部Birjand地区的18个家鼠标本中发现了一种新的x常染色体易位细胞型。x染色体的染色体易位较大，采用核型不对称法作为有效的统计参数提取染色体长度变异系数。根据本研究数据，结果Birjand人群在所有不对称指标(AI、DI、As%、A、A2、A1和Syi%)中均未出现不对称，这一结果也证实了Birjand染色体的易位。

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Iranian Journal of Animal Biosystematics

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