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Genetics, Vol. 165, 1733-1744, December 2003, Copyright © 2003

Role of Mismatch Repair in the Fidelity of RAD51- and RAD59-Dependent Recombination in Saccharomyces cerevisiae

Rachelle Miller Spella and Sue Jinks-Robertsona
a Department of Biology, Emory University, Atlanta, Georgia 30322

Corresponding author: Sue Jinks-Robertson, Emory University, 1510 Clifton Rd., Atlanta, GA 30322., jinks{at}biology.emory.edu (E-mail)

Communicating editor: A. NICOLAS

To prevent genome instability, recombination between sequences that contain mismatches (homeologous recombination) is suppressed by the mismatch repair (MMR) pathway. To understand the interactions necessary for this regulation, the genetic requirements for the inhibition of homeologous recombination were examined using mutants in the RAD52 epistasis group of Saccharomyces cerevisiae. The use of a chromosomal inverted-repeat recombination assay to measure spontaneous recombination between 91 and 100% identical sequences demonstrated differences in the fidelity of recombination in pathways defined by their dependence on RAD51 and RAD59. In addition, the regulation of homeologous recombination in rad51 and rad59 mutants displayed distinct patterns of inhibition by different members of the MMR pathway. Whereas the requirements for the MutS homolog, MSH2, and the MutL homolog, MLH1, in the suppression of homeologous recombination were similar in rad51 strains, the loss of MSH2 caused a greater loss in homeologous recombination suppression than did the loss of MLH1 in a rad59 strain. The nonequivalence of the regulatory patterns in the wild-type and mutant strains suggests an overlap between the roles of the RAD51 and RAD59 gene products in potential cooperative recombination mechanisms used in wild-type cells.




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