Synaptonemal Complex and Male Crossing-over in <i>Drosophila ananassae</i>
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چکیده
منابع مشابه
Heterochromatin, the synaptonemal complex and crossing over.
A combined light- and electron-microscopic examination of chromosomes from two angiospermous plants, Plantago ovata and Lycopersicon esculentum, and a mammal, Mus musculus, was performed. From this investigation three observations have been made that may be relevant to the observed lack of crossing over in heterochromatin. (1) Differential staining indicates that heterochromatin represents a sm...
متن کاملThe Synaptonemal Complex Component C(2)M Regulates Meiotic Crossing over in Drosophila
BACKGROUND The synaptonemal complex (SC) is a proteinaceous structure that forms between homologously paired meiotic chromosomes. Previous studies have suggested that the SC is required for meiotic crossing over in Drosophila. However, only one component of this structure, C(3)G, has been identified in Drosophila. RESULTS Mutations in c(2)M cause a reduced frequency of meiotic crossing over d...
متن کاملSynaptonemal Complex Length Variation in Wild-Type Male Mice
Meiosis yields haploid gametes following two successive divisions of a germ cell in the absence of intervening DNA replication. Balanced segregation of homologous chromosomes in Meiosis I is aided by a proteinaceous structure, the synaptonemal complex (SC). The objective of this study was to determine total average autosomal SC lengths in spermatocytes in three commonly used mouse strains (129S...
متن کاملLoss of HR6B ubiquitin-conjugating activity results in damaged synaptonemal complex structure and increased crossing-over frequency during the male meiotic prophase.
The ubiquitin-conjugating enzymes HR6A and HR6B are the two mammalian homologs of Saccharomyces cerevisiae RAD6. In yeast, RAD6 plays an important role in postreplication DNA repair and in sporulation. HR6B knockout mice are viable, but spermatogenesis is markedly affected during postmeiotic steps, leading to male infertility. In the present study, increased apoptosis of HR6B knockout primary s...
متن کاملElements causing male crossing over in Drosophila melanogaster.
A second chromosome line of Drosophila melanogaster (Symbol: T-007) has previously been shown to be responsible for the induction of male recombination. In the present investigation, the genetic elements responsible for this phenomenon have been partially identified and mapped. A major element (Symbol: Mr, for Male recombination) locates on the second chromosome between the pr (2L-54.4) and c (...
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ژورنال
عنوان ژورنال: CYTOLOGIA
سال: 1974
ISSN: 0011-4545,1348-7019
DOI: 10.1508/cytologia.39.829