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Originally published as Genetics Published Articles Ahead of Print on May 4, 2007.
Genetics, Vol. 176, 1391-1402, July 2007, Copyright © 2007
doi:10.1534/genetics.107.073056
A Mutant Allele of the Transcription Factor IIH Helicase Gene, RAD3, Promotes Loss of Heterozygosity in Response to a DNA Replication Defect in Saccharomyces cerevisiae
Michelle S. Navarro*,
Liu Bi
and
Adam M. Bailis*,1
* Division of Molecular Biology, Beckman Research Institute, City of Hope National Medical Center, Duarte, California 91010-0269 and Department of Botany and Plant Sciences, University of California, Riverside, California 92521
1 Corresponding author: Division of Molecular Biology, Beckman Institute of the City of Hope, 1450 E. Duarte Rd., Duarte, CA 91010-0269.
E-mail: abailis{at}bricoh.edu
Increased mitotic recombination enhances the risk for loss of heterozygosity, which contributes to the generation of cancer in humans. Defective DNA replication can result in elevated levels of recombination as well as mutagenesis and chromosome loss. In the yeast Saccharomyces cerevisiae, a null allele of the RAD27 gene, which encodes a structure-specific nuclease involved in Okazaki fragment processing, stimulates mutation and homologous recombination. Similarly, rad3-102, an allele of the gene RAD3, which encodes an essential helicase subunit of the core TFIIH transcription initiation and DNA repairosome complexes confers a hyper-recombinagenic and hypermutagenic phenotype. Combining the rad27 null allele with rad3-102 dramatically stimulated interhomolog recombination and chromosome loss but did not affect unequal sister-chromatid recombination, direct-repeat recombination, or mutation. Interestingly, the percentage of cells with Rad52-YFP foci also increased in the double-mutant haploids, suggesting that rad3-102 may increase lesions that elicit a response by the recombination machinery or, alternatively, stabilize recombinagenic lesions generated by DNA replication failure. This net increase in lesions led to a synthetic growth defect in haploids that is relieved in diploids, consistent with rad3-102 stimulating the generation and rescue of collapsed replication forks by recombination between homologs.
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