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DNA Repair (Amst). 2019 Mar;75:18-28. doi: 10.1016/j.dnarep.2019.01.007. Epub 2019 Jan 24.

Single-strand annealing mediates the conservative repair of double-strand DNA breaks in homologous recombination-defective germ cells of Caenorhabditis elegans.

Author information

1
Department of Biochemistry, College of Life Science & Biotechnology, Yonsei University, 03772, Seoul, Republic of Korea.
2
Department of Medicine, Hematology/Oncology Division, Brody School of Medicine at East Carolina University, Greenville, NC, 27834, United States.
3
Department of Biochemistry, College of Life Science & Biotechnology, Yonsei University, 03772, Seoul, Republic of Korea. Electronic address: kooh@yonsei.ac.kr.

Abstract

A missense mutation in C. elegans RAD-54, a homolog of RAD54 that operates in the homologous recombination (HR) pathway, was found to decrease ATPase activity in vitro. The hypomorphic mutation caused hypersensitivity of C. elegans germ cells to double-strand DNA breaks (DSBs). Although the formation of RAD-51 foci at DSBs was normal in both the mutant and knockdown worms, their subsequent dissipation was slow. The rad-54-deficient phenotypes were greatly aggravated when combined with an xpf-1 mutation, suggesting a conservative role of single-strand annealing (SSA) for DSB repair in HR-defective worms. The phenotypes of doubly-deficient rad-54;xpf-1 worms were partially suppressed by a mutation of lig-4, a nonhomologous end-joining (NHEJ) factor. In summary, RAD-54 is required for the dissociation of RAD-51 from DSB sites in C. elegans germ cells. Also, NHEJ and SSA exert negative and positive effects, respectively, on genome stability when HR is defective.

KEYWORDS:

DNA repair; Double-strand DNA break; Homologous recombination; Single-strand annealing

PMID:
30710866
DOI:
10.1016/j.dnarep.2019.01.007
[Indexed for MEDLINE]

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