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GartnerAnton

Gartner, Anton
DNA Damage Response and Genetic Toxicology
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Combinatorial Regulation of Meiotic Holliday Junction Resolution in C. elegans by HIM-6 (BLM) Helicase, SLX-4, and the SLX-1, MUS-81 and XPF-1 Nucleases

Author(s)
Agostinho, AnaMeier, BettinaSonneville, RemiJagut, MarleneWoglar, AlexanderBlow, JulianJantsch, VerenaGartner, Anton
Issued Date
2013-07
DOI
10.1371/journal.pgen.1003591
URI
https://scholarworks.unist.ac.kr/handle/201301/30986
Fulltext
https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1003591
Citation
PLOS GENETICS, v.9, no.7, pp.e1003591
Abstract
Holliday junctions (HJs) are cruciform DNA structures that are created during recombination events. It is a matter of considerable importance to determine the resolvase(s) that promote resolution of these structures. We previously reported that C. elegans GEN-1 is a symmetrically cleaving HJ resolving enzyme required for recombinational repair, but we could not find an overt role in meiotic recombination. Here we identify C. elegans proteins involved in resolving meiotic HJs. We found no evidence for a redundant meiotic function of GEN-1. In contrast, we discovered two redundant HJ resolution pathways likely coordinated by the SLX-4 scaffold protein and also involving the HIM-6/BLM helicase. SLX-4 associates with the SLX-1, MUS-81 and XPF-1 nucleases and has been implicated in meiotic recombination in C. elegans. We found that C. elegans [mus-81; xpf-1], [slx-1; xpf-1], [mus-81; him-6] and [slx-1; him-6] double mutants showed a similar reduction in survival rates as slx-4. Analysis of meiotic diakinesis chromosomes revealed a distinct phenotype in these double mutants. Instead of wildtype bivalent chromosomes, pairs of "univalents" linked by chromatin bridges occur. These linkages depend on the conserved meiosis-specific transesterase SPO-11 and can be restored by ionizing radiation, suggesting that they represent unresolved meiotic HJs. This suggests the existence of two major resolvase activities, one provided by XPF-1 and HIM-6, the other by SLX-1 and MUS-81. In all double mutants crossover (CO) recombination is reduced but not abolished, indicative of further redundancy in meiotic HJ resolution. Real time imaging revealed extensive chromatin bridges during the first meiotic division that appear to be eventually resolved in meiosis II, suggesting back-up resolution activities acting at or after anaphase I. We also show that in HJ resolution mutants, the restructuring of chromosome arms distal and proximal to the CO still occurs, suggesting that CO initiation but not resolution is likely to be required for this process.
Publisher
PUBLIC LIBRARY SCIENCE
ISSN
1553-7404
Keyword
DOUBLE-STRAND BREAKSBLOOMS-SYNDROME HELICASEAURORA-B-KINASECAENORHABDITIS-ELEGANSGENE CONVERSIONCROSSING-OVERDNA-DAMAGEHOMOLOGOUS RECOMBINATIONSTRUCTURED ILLUMINATIONCROSSOVER INTERFERENCE

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