Lee M R, Martin L K
Cytogenet Cell Genet. 1980;28(1-2):95-103. doi: 10.1159/000131517.
Certain past studies have suggested that the taxa Mastomys (= Praomys) and Rattus were closely allied phyletically. We here present detailed (C- and G-banding and NOR's) comparisons of the karyotypes of M. natalensis (2n = 36) and R. norvegicus (2n = 42). A standardized G-banded karyotype of M. natalensis is also presented. About 45% of the G-banded karyotype of M. natalensis is homologous with that of R, norvegicus. Autosomal constitutive heterochromatin is nearly equivalent in the two species; the X and Y chromosomes of M. natalensis, however, have exceptionally large heterochromatic segments. Both species possess three pairs of NOR's, but adjacent G-banded regions are homologous for only one of these. Primarily on the basis of overall G-band homology, we regard the two taxa as only distantly related.
某些过去的研究表明，非洲巨鼠属（= 非洲柔毛鼠属）和家鼠属在系统发育上密切相关。我们在此展示了 Natalensis 非洲巨鼠（2n = 36）和褐家鼠（2n = 42）核型的详细（C 带和 G 带以及核仁组织区）比较。还展示了 Natalensis 非洲巨鼠的标准化 G 带核型。Natalensis 非洲巨鼠的 G 带核型约 45% 与褐家鼠的同源。两个物种的常染色体组成型异染色质几乎相当；然而，Natalensis 非洲巨鼠的 X 和 Y 染色体具有异常大的异染色质区段。两个物种都有三对核仁组织区，但相邻的 G 带区域仅其中一对是同源的。主要基于整体 G 带同源性，我们认为这两个分类单元仅具有远缘关系。
