Reconsideration of the karyological relationship between two Japanese species of shrew-moles, Dymecodon pilirostris and Urotuichus talpoides
Reconsideration of the karyological relationship between two Japanese species of shrew-moles, Dymecodon pilirostris and Urotuichus talpoides
复制标题
DOI：
10.2108/zsj.16.167
复制
发表时间：
1999-02-01
影响因子：
0.9
通讯作者：
Obara, Y
中科院分区：
文献类型：
--
作者：
Kawada, S;Obara, Y
本文用G-、C-、NOR-、Q-和CMA-五种染色方法，对小日本地鼠Dymecodon pilirostris（2n = 34）和大日本地鼠Urotrichus talpoides（2n = 34）的核型关系进行了研究。染色结果显示，两种鱼的13对常染色体和性染色体在带型上具有很强的同源性。其余三对常染色体，编号。13，14和15，表现出明显的种间差异，无论是在带型和各自的染色体形态。这些种间差异可以分别用染色质中一个异常区域（G-、C-、NOR-和Q-带阴性，但CMA-带阳性）的存在或不存在、臂间倒位inv（14）（p13 q31）和C-异染色质的重复来解释。有人认为，在U. talpoides可能含有高度重复的富含GC的序列，即使它的染色性质似乎是独特的，并不像那些所谓的C-异染色质。详细的配对分析显带染色体，使我们修订的关系，提出了以前由Hamada和Yosida，D。pilirostris和U. talpoides（Hamada和Yosida，La Kromosomo II-20，585-590，1980）。
Details of the karyological relationship between the lesser Japanese shrew-mole Dymecodon pilirostris (2n = 34) and the greater Japanese shrew-mole Urotrichus talpoides (2n = 34) were examined by five differential-staining techniques, namely, G-, C-, NOR-, Q- and CMA-banding. Staining revealed that thirteen autosomal pairs and the sex chromosomes of the two species exhibited strong homology in terms of banding patterns. The remaining three autosomal pairs, nos.13, 14 and 15, exhibited distinct interspecific differences both in banding patterns and in the morphology of the respective chromosomes. These interspecific differences can be explained by the presence or absence of an unusual (G-, C-, NOR- and Q-band-negative, but CMA-band-positive) region of chromatin, by the pericentric inversion inv (14) (p13q31), and by duplication of C-heterochromatin, respectively. It has been suggested that the unusual chromatin found in U. talpoides might contain highly repetitive GC-rich sequences, even though its staining properties appear to be unique and are unlike those of so-called C-heterochromatin. Detailed pair-matching analyses of banded chromosomes led us to revise the relationship, proposed previously by Hamada and Yosida, between D. pilirostris and U. talpoides(Hamada and Yosida, La Kromosomo II-20, 585-590, 1980).