Chromosomal Polymorphism in the Gray Shrew Crocidura attenuata (Mammalia: Insectivora)
Chromosomal Polymorphism in the Gray Shrew Crocidura attenuata (Mammalia: Insectivora)
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DOI：
10.2108/zsj.18.1153
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发表时间：
2001-11
期刊：
影响因子：
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通讯作者：
M. Motokawa;M. Harada;Yi Wu;Liang-kong Lin;Hitoshi Suzuki
中科院分区：
文献类型：
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作者：
M. Motokawa;M. Harada;Yi Wu;Liang-kong Lin;Hitoshi Suzuki
本文报道了采自广东中国南部的1872年产的瘦花大口甲的常规核型和G-显带核型。二倍体染色体数目(2n)在35~38之间变化，而基本臂数(Fn)始终为54。在常染色体中，包括4对中或亚中着丝粒、3对亚端着丝粒和7对顶端着丝粒的14对常染色体在所有标本中均未表现出变异，其余的则表现出罗伯逊式的多态。X染色体为中等大小的亚中部着丝粒染色体，Y染色体为小的顶着丝粒染色体。这些核型不同于台湾产的淡色锦鸡儿，后者有40条染色体，56条臂。这种差异在很大程度上归因于非罗伯逊重排，其中2n和Fn值彼此不同。广东地区核型中观察到的最大中着丝粒对可能是与台湾同源的一对顶端着丝粒和一对亚端着丝粒之间的着丝粒-端粒易位所致。广东和台湾样本的线粒体细胞色素b基因的形态计量学差异和序列差异都较小。然而，广东和台湾的树鼠核型之间的非罗伯逊重排假设表明，它们在生殖上是相互隔离的。因此，东部大陆种群和台湾种群可能代表不同的种，分别命名为C.tenuata(Sensu Stricto)和C.tanakae Kuroda，1938。
Abstract Conventional and G-banded karyotypes of Crocidura attenuata Milne-Edwards, 1872 from Guangdong, southern China, are reported. The diploid chromosome number (2n) varied from 35 to 38 among specimens, while the fundamental arm number (FN) consistently was 54. Of the autosomes, 14 pairs including four meta- or submetacentric, three subtelocentric, and seven acrocentric pairs showed no variation in all specimens, whereas the remaining pairs showed Robertsonian polymorphism. The X and Y chromosomes were medium sized submetacentric and small acrocentric chromosomes, respectively. These karyotypes differ from that of C. attenuata from Taiwan, which has 40 chromosomes with 56 arms. Such differences are largely attributable to a non-Robertsonian rearrangement, where both 2n and FN values are different from each other. The largest metacentric pair observed in karyotypes from Guangdong may have resulted from the centromere-telomere translocation between an acrocentric and a subtelocentric pairs of karyotype homologous to that from Taiwan. Both morphometric difference and sequence divergence in mitochondrial cytochrome b gene between samples from Guangdong and Taiwan was relatively small. However, the nonRobertsonian rearrangement assumed between karyotypes of the shrews from Guangdong and Taiwan suggest that they are reproductively isolated from each other. The eastern continental and Taiwanese populations therefore may represent different species under the names, C. attenuata (sensu stricto), and C. tanakae Kuroda, 1938, respectively.