Molina J, Martínez-Flores I, Templado C, García M, Egozcue J
Department of Biology, University of the Zulia, Maracaibo, Venezuela, Spain.
Histol Histopathol. 1998 Oct;13(4):949-54. doi: 10.14670/HH-13.949.
We describe the synaptic process during meiotic prophase in spermatocytes from Locusta migratoria, using synaptonemal complex (SC) spreads analyzed by light (LM) and electron (EM) microscopy. At leptotene, a stage of short duration, unpaired axial elements begin to be assembled. Synapsis starts at zygotene, beginning usually at the terminal regions of the bivalents, either at the proximal, centromeric end or at the distal, non-centromeric end; interstitial initiation of synapsis was only occasionally observed in the longer chromosomes. Pairing is asynchronous, and shorter chromosomes are the first to complete synapsis. At pachytene all bivalents are fully synapsed. Diplotene is characterized by the progressive fragmentation of SCs; fragmentation is asynchronous, and affects mainly the longer chromosomes, while the shorter ones maintain their morphology up to late diplotene.
我们利用通过光镜（LM）和电镜（EM）分析的联会复合体（SC）铺展技术，描述了飞蝗精母细胞减数分裂前期的突触过程。在细线期这个持续时间较短的阶段，未配对的轴元件开始组装。联会始于偶线期，通常从二价体的末端区域开始，要么在近端着丝粒端，要么在远端非着丝粒端；在较长的染色体中偶尔会观察到联会的中间起始。配对是异步的，较短的染色体最先完成联会。在粗线期，所有二价体都完全联会。双线期的特征是SC逐渐断裂；断裂是异步的，主要影响较长的染色体，而较短的染色体在双线期末期之前保持其形态。
