Analysis of spontaneous and double-strand break-induced recombination in rad mutants of S. pombe.
Schizosaccharomyces pombe strains containing direct repeats of adeó heteroalleles separated by a functional uro4+ gene, and a DNA site for induction of a double-strand break (DSB), have been used to analyze pathways of spontaneous and DSB-induced intrachromosomal mitotic recombination. These substrates yield Ade+ Ura+ convertants or Ade+ Ura- deletions, by the DSB/gap repair and single-strand annealing (SSA) pathways of recombination, respectively. In S. cerevisiae, the DSB/gap repair pathway is RAD52 dependent, and the RAD1 and RAD10 genes are involved in the SSA pathway. We have sought to understand the genetic control of the pathways of mitotic recombination in S. pombe by determining the effects of mutations in six rad genes involved in DNA repair: rad1 and rad3 involved in checkpoint control in response to unreplicated or damaged DNA; rad5 (homologue of S. cerevisiae RAD3) and rad10 (homologue of S. cerevisiae RAD1) involved in nucleotide excision repair; rad21 and rad22 (homologue of S. cerevisiae RAD52) involved in the repair of ionizing radiation-induced DNA damage. The results suggest that the genetic control of the pathways of spontaneous and DSB-induced mitotic intrachromosomal recombination in S. pombe is different from that in S. cerevisiae.
Fortunato
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EA
Department of Biology, University of California San Diego, La Jolla 92093-0322, USA.
Osman
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F
Subramani
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D000251:Adenosine Triphosphatases; D004249:DNA Damage; D004265:DNA Helicases; D004260:DNA Repair / Q000235:genetics*; D004720:Endonucleases / Q000235:genetics / Q000502:physiology*; D004843:Epistasis, Genetic; D005656:Fungal Proteins / Q000235:genetics / Q000502:physiology*; D005800:Genes, Fungal; D009154:Mutation; D011995:Recombination, Genetic / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D012568:Schizosaccharomyces / Q000235:genetics*; D015719:Single-Strand Specific DNA and RNA Endonucleases
D005656:Fungal Proteins; D029701:Saccharomyces cerevisiae Proteins; D004720:Endonucleases; C064162:RAD10 protein, S cerevisiae; D015719:Single-Strand Specific DNA and RNA Endonucleases; D000251:Adenosine Triphosphatases; C076225:RAD5 protein, S cerevisiae; D004265:DNA Helicases