[东亚小鼠半岛姬鼠精母细胞A染色体和B染色体的联会复合体]

[Synaptonemal complexes of the A- and B-chromosomes of the spermatocytes from the East Asian mouse Apodemus peninsulae].

作者信息

Borbiev T E, Kolomiets O L, Borisov Iu M, Safronova A D, Bogdanov Iu F

出版信息

Tsitologiia. 1990;32(2):193-7.

Abstract

The analysis of whole-mount preparations of synaptonemal complexes (SCs) from surface-spread spermatocytes of A. peninsulae (2n = 48A + 1, 2, ... 12 B) had revealed SCs of 23 autosomal bivalents, sex bivalent XY, axial cores and SCs of the B-chromosomes. The intercellular and interindividual variability of the number of B-chromosomes varied from 1 to 12 per cell. The SCs of autosomal bivalents were shown to have a typical structure. The structure and behaviour of SCs of sex bivalent throughout meiotic prophase I appeared to be similar to those observed in other species of this order. Mainly B-univalents and less frequently B-bivalents containing SCs were found to be formed in meiotic prophase I. The full homologues appear to be rarely seen among B-chromosomes of the East-Asiatic mouse. A tendency of forming clusters of B-univalents near the sex bivalent was found, in addition to B-bivalents with lateral elements, having the form of bi- and tri-stranded elements with rare synaptic fragments. Besides this, the SCs of the autosomes of pachytene cells were found to contain structures resembling the recombination nodules.

摘要

对半岛田鼠（2n = 48A + 1, 2, ... 12 B）表面铺展精母细胞的联会复合体（SCs）整装标本进行分析，结果显示有23个常染色体二价体的SCs、性染色体二价体XY、轴芯以及B染色体的SCs。每个细胞中B染色体数量的细胞间和个体间变异性为1至12条。常染色体二价体的SCs显示出典型结构。性染色体二价体的SCs在减数分裂前期I的结构和行为似乎与该目其他物种中观察到的相似。在减数分裂前期I主要发现了B单价体，较少发现含有SCs的B二价体。在东亚田鼠的B染色体中似乎很少见到完全同源的染色体。除了具有双链和三链元件形式且带有罕见突触片段的带有侧生元件的B二价体之外，还发现了在性染色体二价体附近形成B单价体簇的趋势。此外，还发现粗线期细胞常染色体的SCs含有类似重组节的结构。