ArticleNucleic acids research2024
Somatic and intergenerational G4C2 hexanucleotide repeat instability in a human C9orf72 knock-in mouse model.
Article in Nucleic acids research, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers, 1 of them a synthesis that pooled it.
What it found
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
7 citing papers in PubMed, 1 synthesis or guideline pooled it, 9 citations in OpenAlex.
- C9orf72-related amyotrophic lateral sclerosis-frontotemporal dementia and links to the DNA damage response: a systematic review.Frontiers in molecular neuroscience · 2025Pooled it
- Insights into X-linked Dystonia-Parkinsonism and Spinocerebellar Ataxia type 36 Through the Lens of Amyotrophic Lateral Sclerosis/Frontotemporal Dementia.Molecular neurobiology · 2026Review
- Tandem repeats in human brain evolution and disease susceptibility.Molecules and cells · 2026Review
- Emerging drivers of DNA repeat expansions.Biochemical Society transactions · 2025Review
- Recurrent DNA nicks drive massive expansions of (GAA)Proceedings of the National Academy of Sciences of the United States of America · 2024Article
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Corrections and comments
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Authors and funding
29 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Expansion of a G4C2 repeat in the C9orf72 gene is associated with familial Amyotrophic Lateral Sclerosis (ALS) and Frontotemporal Dementia (FTD). To investigate the underlying mechanisms of repeat instability, which occurs both somatically and intergenerationally, we created a novel mouse model of familial ALS/FTD that harbors 96 copies of G4C2 repeats at a humanized C9orf72 locus. In mouse embryonic stem cells, we observed two modes of repeat expansion. First, we noted minor increases in repeat length per expansion event, which was dependent on a mismatch repair pathway protein Msh2. Second, we found major increases in repeat length per event when a DNA double- or single-strand break (DSB/SSB) was artificially introduced proximal to the repeats, and which was dependent on the homology-directed repair (HDR) pathway. In mice, the first mode primarily drove somatic repeat expansion. Major changes in repeat length, including expansion, were observed when SSB was introduced in one-cell embryos, or intergenerationally without DSB/SSB introduction if G4C2 repeats exceeded 400 copies, although spontaneous HDR-mediated expansion has yet to be identified. These findings provide a novel strategy to model repeat expansion in a non-human genome and offer insights into the mechanism behind C9orf72 G4C2 repeat instability.
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