Souza M J, Yonenaga-Yassuda Y
Cytogenet Cell Genet. 1982;33(3):197-203. doi: 10.1159/000131755.
G-banding, C-banding, and silver staining techniques were used to analyze the chromosomes of Trichomys apereoides. In a sample of 22 specimens the diploid number was 2n = 30, with several pairs of biarmed chromosomes and a large metacentric (pair 1) with a secondary constriction, or nucleolar organizing region (NOR), in the short arm. One male had a heteromorphic pair 1, with only one NOR-bearing homolog. C-bands showed constitutive heterochromatin in the centromeric region of almost all autosomes. The X has a large block in the proximal region and an interstitial small band in the long arm. The Y is totally heterochromatic. One heteromorphic female with an increased C-band block in one of the X chromosomes was observed. The Y is a small submetacentric; one male showed a metacentric Y, resulting probably from a pericentric inversion. The sexual bivalent and the synaptonemal complexes of all autosomal bivalents were revealed by silver staining in pachytene cells.
采用G显带、C显带和银染技术对粗尾鼠（Trichomys apereoides）的染色体进行分析。在22个样本中，二倍体数为2n = 30，有几对双臂染色体和一对大型中着丝粒染色体（第1对），其短臂有一个次缢痕，即核仁组织区（NOR）。一只雄性个体的第1对染色体异形，只有一条带有NOR的同源染色体。C显带显示几乎所有常染色体的着丝粒区域都有组成型异染色质。X染色体在近端区域有一个大的区段，长臂有一个中间小带。Y染色体完全是异染色质的。观察到一只异形雌性个体，其一条X染色体上的C带区段增加。Y染色体是一条小的亚中着丝粒染色体；一只雄性个体显示Y染色体为中着丝粒染色体，可能是由臂间倒位导致的。在粗线期细胞中通过银染揭示了性二价体和所有常染色体二价体的联会复合体。
