Kartavtseva I. V., Sheremetyeva I. N., Pavlenko M. V.
В журнале Russian Journal of Genetics
Год: 2021 Том: 57 Номер: 1 Страницы: 70-82
On the basis of a study of our own and published data on voles from the shores of Lake Evoron (n = 8) and the Amgun River (n = 8) in the Evoron-Chukchagir lowland, as well as individuals from laboratory breeding, new data on karyotypic variation (2n = 38–41, NF = 54–59), chromosomal transformations, and their combinations in the karyotype are presented. The numbering of chromosomes in the Evoron vole karyotype using differential (GTG) staining methods made it possible to identify pairs of chromosomes involved in various chromosomal rearrangements and to number the original pairs for the pairs formed from them by chromosome fusion. The tandem telomere-telomere (TTel) fusions of biarmed chromosomes form a large submetacentric element Mev1/4M; telomere-centromere fusion (TCen) as a result of inactivation of the centromere in one of the acrocentric pairs forms either an acrocentric (Mev17/18A) or metacentric element (Mev17/18M), and the Robertsonian translocation of the same pairs forms a metacentric element (Mev17/18M). The variability of the centromere position in two pairs of autosomes (Mev8 and Mev14) is also shown. The revealed rearrangements made it possible to describe twelve variants of the karyotype: two with 2n = 41, six with 2n = 40, three with 2n = 39, and one with 2n = 38. It is proposed that the voles of the Evoron- Chukchagir lowland be assigned to the “еvoron” chromosome race, and the other voles be assigned to the “argi” race. Prolific offspring from the individuals with TTel fusion in the karyotype and a high percentage of this rearrangement in individuals from natural sample sets indicates the absence of a harmful effect on the viability of voles.
