Treus V V, Iasinetskaia N I, Treus M Iu, Chiriaeva O G, Nikitin N S, Smirnov A F
Genetika. 1997 Sep;33(9):1273-80.
Heterochromatin distribution was studied in three species of subfamily Bovinae: bison (Bison bison), European bison (Bison bonasus), and gayal (Bos frontalis). In all of the studied species, C- and CMA3-banding and in situ hybridization with satellite DNAII (satDNAII) revealed the conservative distribution of heterochromatic regions in autosomes; sex chromosomes did not contain the classical constitutive heterochromatin. The Y chromosome was the most variable element of the karyotypes of both bison species and the gayal. A mechanism for formation of the acrocentric Y chromosome in B. bison was suggested. This hypothetical mechanism included breakage of the p arm at the telomeric region and subsequent translocation and inversion. The map of B. bison chromosomes (491 bands per haploid set) is presented. The data obtained are discussed in terms of speciation and the evolution of Bovinae karyotypes.
美洲野牛（Bison bison）、欧洲野牛（Bison bonasus）和大额牛（Bos frontalis）。在所有研究物种中，C带和CMA3带以及与卫星DNAII（satDNAII）的原位杂交显示常染色体上异染色质区域的分布保守；性染色体不含经典的组成型异染色质。Y染色体是两种野牛和大额牛核型中最具变异性的元素。提出了美洲野牛中近端着丝粒Y染色体形成的一种机制。这种假说机制包括p臂在端粒区域的断裂以及随后的易位和倒位。给出了美洲野牛染色体图谱（单倍体组491条带）。从物种形成和牛亚科核型进化的角度对所得数据进行了讨论。
