天山灰仓鼠 Nothocricetulus migratorius 24 染色体形式的核型和分子遗传分化

IF 0.6 4区 生物学 Q4 GENETICS & HEREDITY Russian Journal of Genetics Pub Date : 2024-07-27 DOI:10.1134/s1022795424700431
O. V. Brandler, A. V. Blekhman
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引用次数: 0

摘要

摘要--广布于古北界的啮齿类物种灰仓鼠(Nothocricetulus migratorius)在其整个栖息地范围内的核型染色体数目稳定在2n = 22。我们在天山曲麻莱山脊的局部分布区发现了染色体数目为 2n = 24 的二倍体灰仓鼠。我们首次描述了一种新的核型,并分析了不同染色染色体组的G带和NORs带。所描述的核型与灰仓鼠的 22 染色体核型的区别在于 Y 染色体的形态和另外一对异形小染色体的存在。分子遗传分析表明,N. migratorius 的 24 和 22 染色体型存在遗传分化,它们在线粒体标记上的差异相当,而在核标记上的差异超过了 C. barabensis(2n = 20)和 C. psevdogriseus(2n = 24)。所获得的数据为讨论克拉玛依海脊灰仓鼠 24 染色体形式的分类地位提供了依据,并认为 N. migratorius 核型的分化是染色体物种分化的一个阶段。
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Karyotype and Molecular Genetic Differentiation of a 24-Chromosomal Form of the Gray Hamster Nothocricetulus migratorius from the Tien Shan

Abstract

The widespread Palearctic rodent species gray hamster Nothocricetulus migratorius has a karyotype with a stable number of chromosomes 2n = 22 throughout the entire range of its habitat. We found gray hamsters with diploid number of chromosomes 2n = 24 locally distributed in the Qurama Ridge of the Tian Shan. A new karyotype and analysis of G- and NORs-bands of differentially stained chromosome sets were described for the first time. The described karyotype differs from the 22-chromosomal karyotype of gray hamsters by the Y-chromosome morphology and the presence of an additional pair of heteromorphic small chromosomes. Molecular genetic analysis revealed genetic divergence of 24- and 22-chromosomal forms of N. migratorius, and the differences between them in mitochondrial markers are comparable and in terms of nuclear markers exceed the differences between C. barabensis (2n = 20) and C. psevdogriseus (2n = 24). The data obtained give grounds to discuss the taxonomic status of the 24-chromosomal form of gray hamsters from the Qurama Ridge and consider the differentiation of N. migratorius karyomorphs as a stage of chromosomal speciation.

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来源期刊
Russian Journal of Genetics
Russian Journal of Genetics 生物-遗传学
CiteScore
1.00
自引率
33.30%
发文量
126
审稿时长
1 months
期刊介绍: Russian Journal of Genetics is a journal intended to make significant contribution to the development of genetics. The journal publishes reviews and experimental papers in the areas of theoretical and applied genetics. It presents fundamental research on genetic processes at molecular, cell, organism, and population levels, including problems of the conservation and rational management of genetic resources and the functional genomics, evolutionary genomics and medical genetics.
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