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Mol Cell Biol, April 1998, p. 1891-1902, Vol. 18, No. 4
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Requirement for End-Joining and Checkpoint Functions, but Not RAD52-Mediated Recombination, after EcoRI Endonuclease Cleavage of Saccharomyces cerevisiae DNA

L. Kevin Lewis, Jakob M. Kirchner, and Michael A. Resnick*

Laboratory of Molecular Genetics, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709

Received 23 May 1997/Returned for modification 23 July 1997/Accepted 6 January 1998

RAD52 and RAD9 are required for the repair of double-strand breaks (DSBs) induced by physical and chemical DNA-damaging agents in Saccharomyces cerevisiae. Analysis of EcoRI endonuclease expression in vivo revealed that, in contrast to DSBs containing damaged or modified termini, chromosomal DSBs retaining complementary ends could be repaired in rad52 mutants and in G1-phase Rad+ cells. Continuous EcoRI-induced scission of chromosomal DNA blocked the growth of rad52 mutants, with most cells arrested in G2 phase. Surprisingly, rad52 mutants were not more sensitive to EcoRI-induced cell killing than wild-type strains. In contrast, endonuclease expression was lethal in cells deficient in Ku-mediated end joining. Checkpoint-defective rad9 mutants did not arrest cell cycling and lost viability rapidly when EcoRI was expressed. Synthesis of the endonuclease produced extensive breakage of nuclear DNA and stimulated interchromosomal recombination. These results and those of additional experiments indicate that cohesive ended DSBs in chromosomal DNA can be accurately repaired by RAD52-mediated recombination and by recombination-independent complementary end joining in yeast cells.

* Corresponding author. Mailing address: Laboratory of Molecular Genetics, National Institute of Environmental Health Sciences, 111 Alexander Dr., Research Triangle Park, NC 27709. Phone: (919) 541-4480. Fax: (919) 541-7593. E-mail: resnick{at}niehs.nih.gov.




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