Abstract
Repair of a site-specific double-strand DNA break (DSB) resulted in increased reversion frequency for a nearby allele. Site-specific DSBs were introduced into the genome of Saccharomyces cerevisiae by the endonuclease encoded by the HO gene. Expression of the HO gene from a galactose-inducible promoter allowed efficient DNA cleavage at a single site in large populations of cells. To determine whether the DNA synthesis associated with repair of DSBs has a higher error rate than that associated with genome duplication, HO-induced DSBs were generated 0.3 kb from revertible alleles of trp1. The reversion rate of the trp1 alleles was approximately 100-fold higher among cells that had experienced an HO cut than among uninduced cells. The reverted allele was found predominantly on the chromosome that experienced the DNA cleavage.
MeSH Terms
Alleles
Amino Acid Sequence
Base Sequence
Chromosomes, Fungal
Crosses, Genetic
Crossing Over, Genetic
DNA Repair
DNA, Fungal/biosynthesis
DNA-Directed DNA Polymerase/metabolism
Diploidy
Frameshift Mutation
Genes, Fungal
Genotype
Haploidy
Molecular Sequence Data
Mutagenesis
Oligodeoxyribonucleotides
Restriction Mapping
Saccharomyces cerevisiae/genetics,metabolism
Chemicals
DNA, Fungal
Oligodeoxyribonucleotides
DNA-Directed DNA Polymerase
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Strathern J N
Laboratory of Eukaryotic Gene Expression, NCI-Frederick Cancer Research and Development Center, ABL-Basic Research Program, Maryland 21702-1201, USA.
Shafer B K
McGill C B
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