A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 33 Leninsky pr., 119071, Moscow, Russia.
Zoological Museum, Moscow State University, Moscow, Russia.
Sci Rep. 2021 Dec 30;11(1):24496. doi: 10.1038/s41598-021-03809-4.
Among seven species of the order Eulipotyphla (from southern Gansu and northern Sichuan Provinces, Central China) studied cytogenetically, karyotypes of one talpid species, Uropsilus aff. soricipes (2n = 36, NFa = 54), and three soricid species, Chodsigoa hypsibia (2n = 65, NFa = 66), Sorex cansulus (2n = 42, NFa = 64) and Sorex thibetanus (2n = 42, NFa = 60), are described cytogenetically for the first time. All four species are endemic to China with distribution ranges restricted to the Qinghai-Tibet Plateau and adjacent mountain ranges. The Ch. hypsibia karyotype consists of mostly acrocentric autosomes and one metacentric pair of autosomes; besides, a B chromosome was identified. No polymorphism was detected among karyotypes of other species, including shrews Sorex bedfordiae (2n = 26, NFa = 44), Anourosorex squamipes (2n = 48, NFa = 92) and Crocidura suaveolens (2n = 40, NFa = 44). The Chinese shrew mole U. aff. soricipes and three shrew species (S. bedfordiae, Ch. hypsibia and A. squamipes) represent autochthonous fauna of Central/Western China, whereas S. thibetanus, S. cansulus and C. suaveolens belong to phylogenetic groups occurring mostly to the north and west from China; therefore, they should be considered relatively recent colonisers. Thus, considering the relationships of the species within phylogenetic groups, our results on karyotypes are in good agreement with molecular genetic data.
在中国研究的 7 种真盲缺目（来自中国中南部的甘肃和北部的四川，以及中部地区）物种中，有 1 种鼩鼱物种（乌氏鼩鼱，2n=36，NFa=54）、3 种鼩鼱物种（喜马拉雅鼠兔，2n=65，NFa=66）、贺氏鼠兔（2n=65，NFa=66）、黄腹旱獭（2n=42，NFa=64）和西藏鼠兔（2n=42，NFa=60）的核型被首次进行了细胞遗传学描述。这四个物种均为中国特有种，分布范围局限于青藏高原及其相邻山脉。Ch. hypsibia 的核型主要由近端着丝粒染色体和一对中着丝粒染色体组成；此外，还鉴定出了一条 B 染色体。其他物种的核型没有多态性，包括长尾鼩（2n=26，NFa=44）、四川短尾鼩（2n=48，NFa=92）和贵州栉鼠（2n=40，NFa=44）。中国鼩鼱乌氏鼩鼱和三种鼩鼱（长尾鼩、喜马拉雅鼠兔和四川短尾鼩）代表了中国中西部的本土动物群，而西藏鼠兔、黄腹旱獭和贵州栉鼠则属于主要分布在中国北部和西部的进化支；因此，它们应该被认为是最近的殖民者。因此，考虑到种间的进化关系，我们的核型结果与分子遗传数据非常吻合。
