Cited by 107Genetic factors in colorectal cancerDNA Repair MechanismsFungal and yeast genetics research

Mutation rates, spectra, and genome-wide distribution of spontaneous mutations in mismatch repair deficient yeast.

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Lang, Gregory I, Parsons, Lance, Gammie, Alison E·2013·G3 Genes Genomes Genetics

Abstract

DNA mismatch repair is a highly conserved DNA repair pathway. In humans, germline mutations in hMSH2 or hMLH1, key components of mismatch repair, have been associated with Lynch syndrome, a leading cause of inherited cancer mortality. Current estimates of the mutation rate and the mutational spectra in mismatch repair defective cells are primarily limited to a small number of individual reporter loci. Here we use the yeast Saccharomyces cerevisiae to generate a genome-wide view of the rates, spectra, and distribution of mutation in the absence of mismatch repair. We performed mutation accumulation assays and next generation sequencing on 19 strains, including 16 msh2 missense variants implicated in Lynch cancer syndrome. The mutation rate for DNA mismatch repair null strains was approximately 1 mutation per genome per generation, 225-fold greater than the wild-type rate. The mutations were distributed randomly throughout the genome, independent of replication timing. The mutation spectra included insertions/deletions at homopolymeric runs (87.7%) and at larger microsatellites (5.9%), as well as transitions (4.5%) and transversions (1.9%). Additionally, repeat regions with proximal repeats are more likely to be mutated. A bias toward deletions at homopolymers and insertions at (AT)n microsatellites suggests a different mechanism for mismatch generation at these sites. Interestingly, 5% of the single base pair substitutions might represent double-slippage events that occurred at the junction of immediately adjacent repeats, resulting in a shift in the repeat boundary. These data suggest a closer scrutiny of tumor suppressors with homopolymeric runs with proximal repeats as the potential drivers of oncogenesis in mismatch repair defective cells.

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  1. Silva F. C. Valentin M. D. Ferreira Fde O. Carraro D. M. Rossi B. M., 2009 Mismatch repair genes in Lynch syndrome: a review. Sao Paulo Med. J. 127: 46– 51 19466295 PMC10969316

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Authors
Lang, G. I., Parsons, L., & Gammie, A. E.
Affiliations
Princeton University (US)
Corresponding author
Gammie, Alison E
Venue
G3 Genes Genomes Genetics
Published
2013-09-01
Volume
3
Issue
9
Pages
1453-1465
ISSN
2160-1836 (ISSN-L)
OpenAlex
W2139160625
Cited by
107
References
85
Citations by year
2026: 3 · 2025: 3 · 2024: 2 · 2023: 12 · 2022: 7 · 2021: 14 · 2020: 9 · 2019: 9 · 2018: 8 · 2017: 12 · 2016: 10 · 2015: 13 · 2014: 5
FWCI
6.86
Type
journal article
Language
en
Open access
Locations
  • G3 Genes Genomes Genetics (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Cancer Institute (P30CA072720)
  • National Institute of General Medical Sciences (P50GM071508)
Topics
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Genetic factors in colorectal cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
Keywords
DNA mismatch repair, mutation rate, mutational spectra, Lynch syndrome, MSH2, MLH1, Saccharomyces cerevisiae, microsatellite markers, tumor suppressor, genome-wide mutagenesis, DNA replication timing
MeSH terms
Alleles, Chromosomes, Saccharomyces cerevisiae, Mutagenesis, Insertional, Genome, Fungal, Gene Deletion, Microsatellite Repeats, Mutation, Missense, Saccharomyces cerevisiae Proteins, MutS Homolog 2 Protein, DNA Mismatch Repair, High-Throughput Nucleotide Sequencing, Mutation Rate

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