Synaptonemal complex and crossing-over: structural support or interference?
نویسندگان
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...
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During meiosis, crossing-over--the exchange of genetic material between maternal and paternal chromosomes--is stringently controlled to restrict the number of crossovers per chromosome pair. In this issue of Cell, Martini et al., (2006) report that the reduction of crossover-initiating events does not result in fewer crossovers. These results have important implications for our understanding of...
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A consideration of the data presented in an earlier paper (GRAUBARD 1932) brings out certain facts with regard to the mechanism of crossing over in chromosome I1 of Drosophila melanogaster which may have general significance. In the previous work experiments were performed to study crossing over and interference along the entire length of the normal chromosome I1 and of the same chromosome with...
متن کاملInterference-mediated synaptonemal complex formation with embedded crossover designation.
Biological systems exhibit complex patterns at length scales ranging from the molecular to the organismic. Along chromosomes, events often occur stochastically at different positions in different nuclei but nonetheless tend to be relatively evenly spaced. Examples include replication origin firings, formation of chromatin loops along chromosome axes and, during meiosis, localization of crossove...
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ژورنال
عنوان ژورنال: Heredity
سال: 1978
ISSN: 0018-067X,1365-2540
DOI: 10.1038/hdy.1978.92