title: Repair of gamma-ray induced DNA strand breaks in the radiation-sensitive mutant rad18-2 of Saccharomyces cerevisiae.
abstract: The repair of gamma-ray induced DNA single and double-strand breaks was looked at in wild type and rad18-2 strains of the yeast Saccharomyces cerevisiae using sucrose gradient centrifugation. It was found that rad18-2 diploid cells could repair single and double-strand breaks induced by gamma-rays. It was also found that rad18-2 cells experienced a breakup of their DNA during post-irradiation incubation to a size smaller than seen in cells just receiving irradiation. This breakup of DNA in rad18-2 cells is not degradation due to cell death since wild type cells irradiated to similar low survival levels do not show this breakup of DNA with 8 h incubation. The breakup of DNA in rad18-2 cells is not due to replication gaps being formed by synthesis on a damaged template since treatment of rad18-2 a mating type cells with alpha factor, to prevent initiation of DNA synthesis, does not prevent breakup of the DNA.
mesh_terms: D004260:DNA Repair / Q000528:radiation effects*; D004271:DNA, Fungal / Q000096:biosynthesis / Q000528:radiation effects*; D005720:Gamma Rays; D009154:Mutation; D011836:Radiation Tolerance; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism / Q000528:radiation effects
chemical_list: D004271:DNA, Fungal