SYNAPTONEMAL COMPLEX-ANALYSIS IN SPERMATOCYTES AND OOCYTES OF RAINBOW-TROUT, ONCORHYNCHUS-MYKISS (PISCES, SALMONIDAE) - THE PROCESS OF AUTOSOME AND SEX-CHROMOSOME SYNAPSIS

被引：31

作者：

OLIVEIRA, C ^{[1
]}

FORESTI, F ^{[1
]}

RIGOLINO, MG ^{[1
]}

TABATA, YA ^{[1
]}

机构：

[1] INST PESCA, ESTACAO EXPTL SALMONICULTURA, SAO PAULO, BRAZIL

来源：

CHROMOSOME RESEARCH | 1995年 / 3卷 / 03期

关键词：

FISH; MEIOSIS; NORS; RAINBOW TROUT; SEX CHROMOSOMES; SYNAPTONEMAL COMPLEX;

D O I：

10.1007/BF00710712

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The surface-spreading synaptonemal complex (SC) technique was employed to analyze spermatocytes and oocytes of rainbow trout in order to visualize the process of autosome and sex chromosome synapsis in this species. The structure of lateral elements (LEs) of the SC and the chromosome synapsis process at the stages of leptotene, zygotene and pachytene are described. Comparative analysis of SCs of spermatocytes and oocytes showed a difference in the synaptic process, i.e. in spermatocytes all LEs were synapsed before the appearance of centromeric regions in the biarmed elements, while in the oocytes some fully synapsed LEs, including the centromeric region of the biarmed elements, were found together with fully or partially unsynapsed LEs. In males the sex chromosome synapsis starts only after all autosomes have synapsed. Irregular synapses involving three or four LEs were found in 3.4% of the cells analyzed in mid or late zygotene. Multivalents were found in males and females. Some aspects of initial meiotic development and their implications in rainbow trout cytogenetics, genetics and evolution are discussed.

引用

页码：182 / 190

页数：9

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