A Link between Meiotic Prophase Progression and Crossover Control
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Life Sciences Division; DOE/OSTI
- Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Life Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology
During meiosis, most organisms ensure that homologous chromosomes undergo at least one exchange of DNA, or crossover, to link chromosomes together and accomplish proper segregation. How each chromosome receives a minimum of one crossover is unknown. During early meiosis in Caenorhabditis elegans and many other species, chromosomes adopt a polarized organization within the nucleus, which normally disappears upon completion of homolog synapsis. Mutations that impair synapsis even between a single pair of chromosomes in C. elegans delay this nuclear reorganization. We quantified this delay by developing a classification scheme for discrete stages of meiosis. Immunofluorescence localization of RAD-51 protein revealed that delayed meiotic cells also contained persistent recombination intermediates. Through genetic analysis, we found that this cytological delay in meiotic progression requires double-strand breaks and the function of the crossover-promoting heteroduplex HIM-14 (Msh4) and MSH-5. Failure of X chromosome synapsis also resulted in impaired crossover control on autosomes, which may result from greater numbers and persistence of recombination intermediates in the delayed nuclei. We conclude that maturation of recombination events on chromosomes promotes meiotic progression, and is coupled to the regulation of crossover number and placement. Our results have broad implications for the interpretation of meiotic mutants, as we have shown that asynapsis of a single chromosome pair can exert global effects on meiotic progression and recombination frequency.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Organization:
- National Institutes of Health (NIH); USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division; Wellcome Trust
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1627265
- Journal Information:
- PLoS Genetics, Journal Name: PLoS Genetics Journal Issue: 2 Vol. 2; ISSN 1553-7404
- Publisher:
- Public Library of ScienceCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
A Link between Meiotic Prophase Progression and CrossoverControl
The conserved AAA ATPase PCH-2 distributes its regulation of meiotic prophase events through multiple meiotic HORMADs in C. elegans
ATM signaling modulates cohesin behavior in meiotic prophase and proliferating cells
Journal Article
·
Wed Jul 06 00:00:00 EDT 2005
· Public Library of Science (PLoS) Genetics
·
OSTI ID:890634
The conserved AAA ATPase PCH-2 distributes its regulation of meiotic prophase events through multiple meiotic HORMADs in C. elegans
Journal Article
·
Thu Apr 13 20:00:00 EDT 2023
· PLoS Genetics
·
OSTI ID:2469722
ATM signaling modulates cohesin behavior in meiotic prophase and proliferating cells
Journal Article
·
Sun Mar 05 19:00:00 EST 2023
· Nature Structural & Molecular Biology
·
OSTI ID:2470954