Characterization of postreplication repair in Saccharomyces cerevisiae and effects of rad6, rad18, rev3 and rad52 mutations

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Abstract

Postreplication repair of nuclear DNA was examined in an excision defective haploid strain of yeast lacking mitochondrial DNA (ral ρ0). The size of the DNA synthesized in cells exposed to various fluences of ultraviolet light (UV) corresponds approximately to the average interdimer distance in the parental DNA. Upon further incubation of cells following exposure to 2.5 J/m2, the DNA increases in size; by 4 h, it corresponds to DNA from uniformly labeled cells. The alkaline sucrose sedimentation pattern of DNA pulse labeled at various times after UV irradiation, for up to 4 h, does not change substantially, indicating that dimers continue to block DNA replication. A significant amount of postreplication repair requires de novo protein synthesis, as determined by its inhibition by cycloheximide. The rad6 mutant does not carry out postreplication repair, the rad18 and rad52 mutants show great inhibition while the rev3 mutation does not affect postreplication repair. Both recombinational and nonrecombinational repair mechanisms may function in postreplication repair and most of postreplication repair is error free.

Original languageEnglish (US)
Pages (from-to)471-478
Number of pages8
JournalMGG Molecular & General Genetics
Volume184
Issue number3
DOIs
StatePublished - Dec 1981
Externally publishedYes

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Saccharomyces cerevisiae
Mutation
DNA
Ultraviolet Rays
Haploidy
Cycloheximide
DNA Replication
Mitochondrial DNA
DNA Repair
Sucrose
Yeasts
Proteins

ASJC Scopus subject areas

  • Genetics

Cite this

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title = "Characterization of postreplication repair in Saccharomyces cerevisiae and effects of rad6, rad18, rev3 and rad52 mutations",
abstract = "Postreplication repair of nuclear DNA was examined in an excision defective haploid strain of yeast lacking mitochondrial DNA (ral ρ0). The size of the DNA synthesized in cells exposed to various fluences of ultraviolet light (UV) corresponds approximately to the average interdimer distance in the parental DNA. Upon further incubation of cells following exposure to 2.5 J/m2, the DNA increases in size; by 4 h, it corresponds to DNA from uniformly labeled cells. The alkaline sucrose sedimentation pattern of DNA pulse labeled at various times after UV irradiation, for up to 4 h, does not change substantially, indicating that dimers continue to block DNA replication. A significant amount of postreplication repair requires de novo protein synthesis, as determined by its inhibition by cycloheximide. The rad6 mutant does not carry out postreplication repair, the rad18 and rad52 mutants show great inhibition while the rev3 mutation does not affect postreplication repair. Both recombinational and nonrecombinational repair mechanisms may function in postreplication repair and most of postreplication repair is error free.",
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