title: Homologous recombination is essential for RAD51 up-regulation in Saccharomyces cerevisiae following DNA crosslinking damage.
abstract: We have determined the kinetics of up-regulation of the homologous recombination gene RAD51, one of the genes induced following DNA damage in isogenic haploid DNA repair-deficient mutants of Saccharomyces cerevisiae, using treatment with the DNA crosslinking agent 8-methoxypsoralen. We show that RAD51 is up-regulated concomitantly, although independently, with a shift from the G1 cell cycle phase to G2/M arrest. This up-regulation is absent in homologous recombination repair-deficient mutants and increased in mutants deficient in nucleotide excision repair and pol(zeta)-dependent translesion synthesis. We demonstrate that the Rad53-dependent DNA damage signal transduction cascade is active in RAD51 non-inducing mutants. However, when independently eliminated, it too abolishes RAD51 up-regulation. We present a model in which RAD51 up-regulation requires two signals: one depending on the Rad53-dependent DNA damage signal transduction cascade and the other on homologous recombination repair.
authors.affiliation: Institut Curie, Section de Recherche, UMR 2027 CNRS/IC, LRC-28V du CEA, Centre Universitaire Paris-Sud, Bât. 110, F-91405 Orsay, France.
authors.forename: Yuval
authors.initials: Y
authors.lastname: Cohen
authors.forename: Michele
authors.initials: M
authors.lastname: Dardalhon
authors.forename: Dietrich
authors.initials: D
authors.lastname: Averbeck
mesh_terms: D002453:Cell Cycle; D002455:Cell Division / Q000187:drug effects / Q000528:radiation effects; D004249:DNA Damage; D004260:DNA Repair; D004268:DNA-Binding Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism; D015966:Gene Expression Regulation, Fungal; D007700:Kinetics; D008730:Methoxsalen / Q000494:pharmacology; D008957:Models, Genetic; D009154:Mutation; D012331:RNA, Fungal / Q000096:biosynthesis; D051135:Rad51 Recombinase; D011995:Recombination, Genetic; D012441:Saccharomyces cerevisiae / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism / Q000528:radiation effects; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction; D015533:Transcriptional Activation; D014466:Ultraviolet Rays; D015854:Up-Regulation
chemical_list: D004268:DNA-Binding Proteins; D012331:RNA, Fungal; D029701:Saccharomyces cerevisiae Proteins; C495151:RAD51 protein, S cerevisiae; D051135:Rad51 Recombinase; D008730:Methoxsalen