The Synaptonemal Complex Component C(2)M Regulates Meiotic Crossing over in Drosophila

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The 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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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...

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The Sgs1 Helicase Regulates Chromosome Synapsis and Meiotic Crossing Over

BACKGROUND In budding yeast, Sgs1 is the sole member of the RecQ family of DNA helicases. Like the human Bloom syndrome helicase (BLM), Sgs1 functions during both vegetative growth and meiosis. The sgs1 null mutant sporulates poorly and displays reduced spore viability. RESULTS We have identified novel functions for Sgs1 in meiosis. Loss of Sgs1 increases the number of axial associations, whi...

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The synaptonemal complex has liquid crystalline properties and spatially regulates meiotic recombination factors

The synaptonemal complex (SC) is a polymer that spans ~100 nm between paired homologous chromosomes during meiosis. Its striated, periodic appearance in electron micrographs led to the idea that transverse filaments within this structure 'crosslink' the axes of homologous chromosomes, stabilizing their pairing. SC proteins can also form polycomplexes, three-dimensional lattices that recapitulat...

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Central region component1, a novel synaptonemal complex component, is essential for meiotic recombination initiation in rice.

In meiosis, homologous recombination entails programmed DNA double-strand break (DSB) formation and synaptonemal complex (SC) assembly coupled with the DSB repair. Although SCs display extensive structural conservation among species, their components identified are poorly conserved at the sequence level. Here, we identified a novel SC component, designated central region component1 (CRC1), in r...

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ژورنال

عنوان ژورنال: Current Biology

سال: 2003

ISSN: 0960-9822

DOI: 10.1016/s0960-9822(03)00050-2