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Reference: Meniel V, et al. (1995) Preferential repair in Saccharomyces cerevisiae rad mutants after induction of interstrand cross-links by 8-methoxypsoralen plus UVA. Mutagenesis 10(6):543-8

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Abstract


The gene specific induction and the incision step of the removal of 8-methoxypsoralen (8-MOP) plus UVA-induced interstrand cross-links (ICL) was measured in repair mutants of Saccharomyces cerevisiae. Events were examined at the MAT alpha and HML alpha loci in mutants deficient in the repair of ICL, namely rad1, rad2 delta, rad52, pso2 and the rad16 mutant which is impaired in the removal of UV-induced pyrimidine dimers from the silent HML alpha locus. Previously, we observed in a wild-type strain (K107) preferential repair concerning the incision of 8-MOP photo-induced ICL. The present study indicates that the two mutants rad1 and rad2 delta show no repair in either locus, due presumably to their deficiency in the incision step of ICL repair. The rad52 mutant which is defective in recombination, is proficient in the preferential incision of ICL at the MAT alpha locus versus the HML alpha locus. The same is true for the pso2 mutant which also lacks the ability to perform complete repair of ICL. The rad16 mutant is unable to repair ICL in the silent locus HML alpha but is proficient in repair (i.e. the incision of ICL) in the transcriptionally active MAT alpha locus.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Meniel V, Magana-Schwencke N, Averbeck D
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