Liu J Y, Zhang C S
Department of Biology, Northeast Nomal University, Changchun.
Shi Yan Sheng Wu Xue Bao. 1996 Mar;29(1):1-11.
The behavior and morphology of sex chromosomes pairing in spermatocytes of the brown rat have been studied by surface spreading, silver and phosphotungstic acid(PTA) staining techniques. The results are as follows. Sex chromosomes axial cores thicken before X and Y pairing. X Y pairing is delayed until early pachytene. The first pairing initiation site is located on telomere of the short arms of X and Y chromosomes. The second pairing initiation site is located on teltomere of the long arms of X and Y chromosomes or on the interstitial position of the long arms of X and Y. Pycnosis speed of sex axial cores is different with different stages during prophase I of meiosis. In middle Pachytene the almost whole Y is fully paired in SC association with about one-third the X. On the region of X-YSC, lateral elements of X-YSC divide into two skeins, bubble appears on one of the two skeins and the unpaired X and Y axial cores are in variable forms. X Y pairing initiation sites, relationship of X Y pairing and genetic homology and mechanism of thickening and variable X Y axial cores were discussed.
采用表面铺展、银染及磷钨酸（PTA）染色技术，对棕色大鼠精母细胞中性染色体配对的行为和形态进行了研究。结果如下。性染色体轴芯在X和Y配对前增厚。XY配对延迟至粗线期早期。第一个配对起始位点位于X和Y染色体短臂的端粒上。第二个配对起始位点位于X和Y染色体长臂的端粒上或X和Y染色体长臂的间质位置。在减数分裂前期I的不同阶段，性轴芯的固缩速度不同。在粗线期中段，几乎整个Y与约三分之一的X在联会复合体中完全配对。在X-Y联会复合体区域，X-Y联会复合体的侧成分分成两束，其中一束出现气泡，未配对的X和Y轴芯形态各异。讨论了XY配对起始位点、XY配对与遗传同源性的关系以及X和Y轴芯增厚及形态各异的机制。
