ホンドハタネズミ(Microtus montebelli montebelli)のG-,C-及びN-バンドパタ-ン--大陸産ハタネズミ(M.oeconomus)との比較分析

概要

論文の詳細を見る
The chromosomes of the Japanese grass vole, Microtus m. montebelli, were examined in detail by G-, C- and N-banding methods, paying special attention to the karyotypic comparison with the root vole, Microtus oeconomus studied by FREDGA et al. (1980) . Interspecific comparison of G-, C- and N-bands confirmed that 1) both species show almost perfect G-band homology in all the chromosomes, excluding the pericentromeric region of the X chromosome, which is also the case with the C-banding patterns, 2) the X chromosome of the Japanese grass vole is 1.7 times as large as that of the root vole: this is attributable to the difference in the size of C-band material, and 3) the distribution pattern of NORs differs completely between the two species; and the discrepancy seems to be caused by translocation and inactivation of NORs. Thus, it is suggested that the Japanese grass vole is closely related, in karyological and systematic aspects, to the root vole, and further that duplication of C-heterochromatin and translocation and/or inactivation of NORs might have played a role in the speciation process of these two microtine species.
日本哺乳類学会の論文