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A Quality Control Mechanism Coordinates Meiotic Prophase Events to Promote Crossover Assurance


The production of sperm and eggs for sexual reproduction depends on meiosis. During this specialized cell division, homologous chromosomes are linked by at least one crossover recombination event, or chiasma, to promote their proper segregation. How events in meiotic prophase are coordinated to contribute to crossover assurance is not well understood. Here, we show that C. elegans PCH-2 regulates a variety of events during meiotic prophase to promote crossover assurance. In the absence of pch-2, pairing, synapsis and recombination are accelerated, resulting in defects in synapsis and crossover formation. We propose that PCH-2 restrains the events of meiotic prophase to coordinate them, ensure their fidelity and guarantee that each homolog pair has at least one crossover to promote proper meiotic chromosome segregation.


Vyšlo v časopise: A Quality Control Mechanism Coordinates Meiotic Prophase Events to Promote Crossover Assurance. PLoS Genet 10(4): e32767. doi:10.1371/journal.pgen.1004291
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1004291

Souhrn

The production of sperm and eggs for sexual reproduction depends on meiosis. During this specialized cell division, homologous chromosomes are linked by at least one crossover recombination event, or chiasma, to promote their proper segregation. How events in meiotic prophase are coordinated to contribute to crossover assurance is not well understood. Here, we show that C. elegans PCH-2 regulates a variety of events during meiotic prophase to promote crossover assurance. In the absence of pch-2, pairing, synapsis and recombination are accelerated, resulting in defects in synapsis and crossover formation. We propose that PCH-2 restrains the events of meiotic prophase to coordinate them, ensure their fidelity and guarantee that each homolog pair has at least one crossover to promote proper meiotic chromosome segregation.


Zdroje

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