ArticleThe Journal of biological chemistry2012
DNA mismatch repair complex MutSβ promotes GAA·TTC repeat expansion in human cells.
Article in The Journal of biological chemistry, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 55 papers.
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Who cites it
55 citing papers in PubMed, 71 citations in OpenAlex.
- Therapeutic combination of L-ascorbic acid, N-acetylcysteine, and dimethyl fumarate in Friedreich's ataxia: insights from in vitro models.Redox report : communications in free radical research · 2025Article
- RNA/DNA-binding protein TDP43 regulates DNA mismatch repair genes with implications for genome stability.Nucleic acids research · 2025Article
- RNA/DNA Binding Protein TDP43 Regulates DNA Mismatch Repair Genes with Implications for Genome Stability.bioRxiv : the preprint server for biology · 2025Article
- The origin of mirror repeats in the human genome.Nucleic acids research · 2025Article
- MSH2 is not required for either maintenance of DNA methylation or repeat contraction at the FMR1 locus in fragile X syndrome or the FXN locus in Friedreich's ataxia.Epigenetics & chromatin · 2025Article
- Somatic instability of the FGF14-SCA27B GAA•TTC repeat reveals a marked expansion bias in the cerebellum.Brain : a journal of neurology · 2025Article
- Repeat expansion in a fragile X model is independent of double strand break repair mediated by Pol θ, RAD52, RAD54 or RAD54B.Scientific reports · 2025Article
- Repeat expansion in a Fragile X model is independent of double strand break repair mediated by Pol θ, Rad52, Rad54l or Rad54b.bioRxiv : the preprint server for biology · 2024Article
- Triplex H-DNA structure: the long and winding road from the discovery to its role in human disease.NAR molecular medicine · 2024Article
- Tandem MutSβ binding to long extruded DNA trinucleotide repeats underpins pathogenic expansions.bioRxiv : the preprint server for biology · 2023Article
- Review
- Mismatch repair is a double-edged sword in the battle against microsatellite instability.Expert reviews in molecular medicine · 2022Review
- Mismatch repair proteins play a role in ATR activation upon temozolomide treatment in MGMT-methylated glioblastoma.Scientific reports · 2022Article
- Polymerases and DNA Repair in Neurons: Implications in Neuronal Survival and Neurodegenerative Diseases.Frontiers in cellular neuroscience · 2022Review
- Impact of G-Quadruplexes on the Regulation of Genome Integrity, DNA Damage and Repair.Biomolecules · 2021Review
- Identifying genetic modifiers of age-associated penetrance in X-linked dystonia-parkinsonism.Nature communications · 2021Observational
- Somatic CAG expansion in Huntington's disease is dependent on the MLH3 endonuclease domain, which can be excluded via splice redirection.Nucleic acids research · 2021Article
- Replication-independent instability of Friedreich's ataxia GAA repeats during chronological aging.Proceedings of the National Academy of Sciences of the United States of America · 2021Article
- The Contribution of Somatic Expansion of the CAG Repeat to Symptomatic Development in Huntington's Disease: A Historical Perspective.Journal of Huntington's disease · 2021Review
- FAN1, a DNA Repair Nuclease, as a Modifier of Repeat Expansion Disorders.Journal of Huntington's disease · 2021Review
Corrections and comments
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Authors and funding
4 authors at 2 institutions in 1 country.
Funding
Abstract
While DNA repair has been implicated in CAG·CTG repeat expansion, its role in the GAA·TTC expansion of Friedreich ataxia (FRDA) is less clear. We have developed a human cellular model that recapitulates the DNA repeat expansion found in FRDA patient tissues. In this model, GAA·TTC repeats expand incrementally and continuously. We have previously shown that the expansion rate is linked to transcription within the repeats. Our working hypothesis is that structures formed within the GAA·TTC repeat during transcription attract DNA repair enzymes that then facilitate the expansion process. MutSβ, a heterodimer of MSH2 and MSH3, is known to have a role in CAG·CTG repeat expansion. We now show that shRNA knockdown of either MSH2 or MSH3 slowed GAA·TTC expansion in our system. We further characterized the role of MutSβ in GAA·TTC expansion using a functional assay in primary FRDA patient-derived fibroblasts. These fibroblasts have no known propensity for instability in their native state. Ectopic expression of MSH2 and MSH3 induced GAA·TTC repeat expansion in the native FXN gene. MSH2 is central to mismatch repair and its absence or reduction causes a predisposition to cancer. Thus, despite its essential role in GAA·TTC expansion, MSH2 is not an attractive therapeutic target. The absence or reduction of MSH3 is not strongly associated with cancer predisposition. Accordingly, MSH3 has been suggested as a therapeutic target for CAG·CTG repeat expansion disorders. Our results suggest that MSH3 may also serve as a therapeutic target to slow the expansion of GAA·TTC repeats in the future.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.