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Title: Identification of DSB-1, a Protein Required for Initiation of Meiotic Recombination in Caenorhabditis elegans, Illuminates a Crossover Assurance Checkpoint

Journal Article · · PLoS Genetics
 [1];  [1];  [2];  [3];  [4];  [5]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology and California Inst. for Quantitative Biosciences (QB3)
  2. Stanford Univ., CA (United States). School of Medicine, Dept. of Developmental Biology and Genetics
  3. Univ. of Cambridge (United Kingdom). The Gurdon Inst. and Dept. of Genetics
  4. Stanford Univ., CA (United States). School of Medicine, Dept. of Developmental Biology and Genetics
  5. Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology and California Inst. for Quantitative Biosciences (QB3); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States) Howard Hughes Medical Inst., Chevy Chase, MD (United States)

Meiotic recombination, an essential aspect of sexual reproduction, is initiated by programmed DNA double-strand breaks (DSBs). DSBs are catalyzed by the widely-conserved Spo11 enzyme; however, the activity of Spo11 is regulated by additional factors that are poorly conserved through evolution. To expand our understanding of meiotic regulation, we have characterized a novel gene, dsb-1, that is specifically required for meiotic DSB formation in the nematode Caenorhabditis elegans. DSB-1 localizes to chromosomes during early meiotic prophase, coincident with the timing of DSB formation. DSB-1 also promotes normal protein levels and chromosome localization of DSB-2, a paralogous protein that plays a related role in initiating recombination. Mutations that disrupt crossover formation result in prolonged DSB-1 association with chromosomes, suggesting that nuclei may remain in a DSB-permissive state. Extended DSB-1 localization is seen even in mutants with defects in early recombination steps, including spo-11, suggesting that the absence of crossover precursors triggers the extension. Strikingly, failure to form a crossover precursor on a single chromosome pair is sufficient to extend the localization of DSB-1 on all chromosomes in the same nucleus. Based on these observations we propose a model for crossover assurance that acts through DSB-1 to maintain a DSB-permissive state until all chromosome pairs acquire crossover precursors. This work identifies a novel component of the DSB machinery in C. elegans, and sheds light on an important pathway that regulates DSB formation for crossover assurance.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division; National Science Foundation (NSF); National Institutes of Health (NIH); Howard Hughes Medical Institute; Office of Research Infrastructure Programs (ORIP)
Grant/Contract Number:
AC02-05CH11231; R01 GM067268; R01 GM065591
OSTI ID:
1627303
Journal Information:
PLoS Genetics, Vol. 9, Issue 8; ISSN 1553-7404
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Protein Phosphatase 4 Promotes Chromosome Pairing and Synapsis, and Contributes to Maintaining Crossover Competence with Increasing Age journal October 2014
The conserved LEM-3/Ankle1 nuclease is involved in the combinatorial regulation of meiotic recombination repair and chromosome segregation in Caenorhabditis elegans journal June 2018
Mouse REC114 is essential for meiotic DNA double-strand break formation and forms a complex with MEI4 journal December 2018
Exploring Potential Germline-Associated Roles of the TRIM-NHL Protein NHL-2 Through RNAi Screening journal October 2017
Zip it up to shut it down journal June 2014
ATM and ATR Influence Meiotic Crossover Formation Through Antagonistic and Overlapping Functions in C. elegans posted_content April 2019
Mouse REC114 is essential for meiotic DNA double-strand break formation and forms a complex with MEI4 posted_content July 2018
LINC complexes promote homologous recombination in part through inhibition of nonhomologous end joining journal December 2016
Environmentally-relevant exposure to diethylhexyl phthalate (DEHP) alters regulation of double-strand break formation and crossover designation leading to germline dysfunction in Caenorhabditis elegans journal January 2020
Phosphorylation of the synaptonemal complex protein SYP-1 promotes meiotic chromosome segregation posted_content October 2017
Initiation of Meiotic Development Is Controlled by Three Post-transcriptional Pathways in Caenorhabditis elegans journal June 2018
Persistent DNA-break potential near telomeres increases initiation of meiotic recombination on short chromosomes posted_content August 2018
The tumor suppressor BRCA1/BARD1 complex localizes to the synaptonemal complex and regulates recombination under meiotic dysfunction in Caenorhabditis elegans posted_content March 2018
A chromatin-associated protein required for inducing and limiting meiotic DNA double-strand break formation journal October 2018
Phosphorylation of the synaptonemal complex protein SYP-1 promotes meiotic chromosome segregation journal December 2017
ATM and ATR Influence Meiotic Crossover Formation Through Antagonistic and Overlapping Functions in Caenorhabditis elegans journal April 2019
BRCA1-BARD1 associate with the synaptonemal complex and pro-crossover factors and influence RAD-51 dynamics during Caenorhabditis elegans meiosis journal November 2018
The tumor suppressor BRCA1-BARD1 complex localizes to the synaptonemal complex and regulates recombination under meiotic dysfunction in Caenorhabditis elegans journal November 2018
Persistent DNA-break potential near telomeres increases initiation of meiotic recombination on short chromosomes journal February 2019
Evidence That Masking of Synapsis Imperfections Counterbalances Quality Control to Promote Efficient Meiosis journal December 2013
The conserved LEM-3/Ankle1 nuclease is involved in the combinatorial regulation of meiotic recombination repair and chromosome segregation in Caenorhabditis elegans posted_content November 2017
Meiotic recombination modulates the structure and dynamics of the synaptonemal complex during C. elegans meiosis journal March 2017