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Genetics, Vol 143, 1127-1135, Copyright © 1996
INVESTIGATIONS |
Mismatch Repair Mutants in Yeast Are Not Defective in Transcription-Coupled DNA Repair of UV-Induced DNA Damage
K. S. Sweder, R. A. Verhage, D. J. Crowley, G. F. Crouse, J. Brouwer and P. C. Hanawalt
Department of Biological Sciences, Stanford University, Stanford, California 94305-5020
Transcription-coupled repair, the targeted repair of the transcribed strands of active genes, is defective in bacteria, yeast, and human cells carrying mutations in mfd, RAD26 and ERCC6, respectively. Other factors probably are also uniquely involved in transcription-repair coupling. Recently, a defect was described in transcription-coupled repair for Escherichia coli mismatch repair mutants and human tumor cell lines with mutations in mismatch repair genes. We examined removal of UV-induced DNA damage in yeast strains mutated in mismatch repair genes in an effort to confirm a defect in transcription-coupled repair in this system. In addition, we determined the contribution of the mismatch repair gene MSH2 to transcription-coupled repair in the absence of global genomic repair using rad7{Delta} mutants. We also determined whether the Rad26-independent transcription-coupled repair observed in rad26{Delta} and rad7{Delta} rad26{Delta} mutants depends on MSH2 by examining repair deficiencies of rad26{Delta} msh2{Delta} and rad7{Delta} rad26{Delta} msh2{Delta} mutants. We found no defects in transcription-coupled repair caused by mutations in the mismatch repair genes MSH2, MLH1, PMS1, and MSH3. Yeast appears to differ from bacteria and human cells in the capacity for transcription-coupled repair in a mismatch repair mutant background.
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