Chromosomal interrelationship of hamster species of the genus Mesocricetus.
Chromosomal interrelationship of hamster species of the genus Mesocricetus.
复制标题
仓鼠属仓鼠的染色体相互关系。
DOI：
10.1159/000131507
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发表时间：
1980
期刊：
影响因子：
--
通讯作者：
J. DePaolo
中科院分区：
文献类型：
--
作者：
N. Popescu;J. DePaolo
本文报道了中国仓鼠属Mesocricetus，M. auratus（2n = 44）、M. brandti（2n = 44和2n = 42）和M. newtoni（2n = 38）。大多数常染色体和性染色体的G-带完全或部分对应，从而为这些物种的分类关系提供了明确的证据。核型差异的发生主要是由于性染色体异染色质的缺失和常染色体易位，经常涉及染色体与异染色质短臂或染色体轴承NOR的。仅发生1例罗伯逊中心融合。尽管遗传物质的排列保守，但异染色质的染色体分布在这些物种的进化过程中出现了分化。M. brandti和newtoni各有一条中部着丝粒染色体，其长臂与亚中部着丝粒M相匹配。auratus常染色体，但短臂对应于两个不同的M.金色染色体这些易位对于解释这些物种的染色体进化方向是至关重要的，并表明M。auratus为常见的祖先种，M.布兰迪和牛顿随后独立进化。
The similarity of chromosomes and the mode by which differences occurred in the chromosomes of the species comprising the genus Mesocricetus, M. auratus (2n = 44), two "cryptic" species of M. brandti (2n = 44 and 2n = 42) and M. newtoni (2n = 38) were determined. Most of the autosomes and the sex chromosomes have either complete or partial G-band correspondence and thus provide definitive evidence for the taxonomic relationship of these species. The karyotypic differences occurred primarily as a result of deletion of sex chromosome heterochromatin and of autosomal translocations that frequently involved chromosomes with heterochromatic short arms or chromosomes bearing NOR's. Only one Robertsonian centric fusion occurred. Despite the conservatism of arrangement of the genetic material, the chromosomal distribution of heterochromatin diverged during the evolution of these species. M. brandti and newtoni each have a metacentric chromosome with a common long arm matching a submetacentric M. auratus autosome, but a short arm corresponding to two different M. auratus chromosomes. These translocations are crucial for explaining the direction of chromosomal evolution of these species and indicate that M. auratus was the commmon ancestral species and that M. brandti and newtoni subsequently evolved independently.