ArticleMolecular neurodegeneration2020
Dipeptide repeat proteins inhibit homology-directed DNA double strand break repair in C9ORF72 ALS/FTD.
Article in Molecular neurodegeneration, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 60 papers, 2 of them syntheses that pooled it.
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Who cites it
60 citing papers in PubMed, 2 syntheses or guidelines pooled it, 101 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
- The contribution of brain banks to knowledge discovery in amyotrophic lateral sclerosis: A systematic review.Neuropathology and applied neurobiology · 2022Pooled it
- Investigational eIF2B activator DNL343 modulates the integrated stress response in preclinical models of TDP-43 pathology and individuals with ALS in a randomized clinical trial.Nature communications · 2025Trial
- Insights into X-linked Dystonia-Parkinsonism and Spinocerebellar Ataxia type 36 Through the Lens of Amyotrophic Lateral Sclerosis/Frontotemporal Dementia.Molecular neurobiology · 2026Review
- The cGAS-STING pathway in inflammaging and neuroinflammation.Science China. Life sciences · 2026Review
- Environmental Factors Drive Neurodegenerative Diseases Through Glutamate Excitotoxicity: A Convergent Mechanistic Pathway.Neuroscience bulletin · 2026Review
- ASO therapy rescues NOTCH2NLC GGC repeat expansion-induced genomic damage, 3D chromatin structural abnormalities, and senescence.Nature communications · 2026Article
- Blocking RAN translation without altering repeat RNAs rescuesScience (New York, N.Y.) · 2026Article
- Article
- Nucleophosmin 1 proteins as potential therapeutic targets in non-communicable chronic inflammatory diseases: a review of pathophysiological mechanisms.Frontiers in cell and developmental biology · 2026Review
- Beyond the ends: potential implications of telomeric repeat-containing RNA (TERRA) for CNS diseases.Journal of molecular cell biology · 2025Review
- Article
- Aberrant splicing exonizes C9orf72 repeat expansion in ALS/FTD.Nature neuroscience · 2025Article
- Targeting GeneInternational journal of molecular sciences · 2025Review
- Review
- RuvBL1/2 reduce toxic dipeptide repeat protein burden in multiple models of C9orf72-ALS/FTD.Life science alliance · 2025Article
- Proteins Associated with Neurodegenerative Diseases: Link to DNA Repair.Biomedicines · 2024Review
- Review
- Co-Aggregation of TDP-43 with Other Pathogenic Proteins and Their Co-Pathologies in Neurodegenerative Diseases.International journal of molecular sciences · 2024Review
- The Effect of Dipeptide Repeat Proteins on FUS/TDP43-RNA Condensation in C9orf72 ALS/FTD.The journal of physical chemistry. B · 2024Article
Corrections and comments
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Authors and funding
17 authors at 5 institutions in 1 country.
Funding
Abstract
backgroundThe C9ORF72 hexanucleotide repeat expansion is the most common known genetic cause of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD), two fatal age-related neurodegenerative diseases. The C9ORF72 expansion encodes five dipeptide repeat proteins (DPRs) that are produced through a non-canonical translation mechanism. Among the DPRs, proline-arginine (PR), glycine-arginine (GR), and glycine-alanine (GA) are the most neurotoxic and increase the frequency of DNA double strand breaks (DSBs). While the accumulation of these genotoxic lesions is increasingly recognized as a feature of disease, the mechanism(s) of DPR-mediated DNA damage are ill-defined and the effect of DPRs on the efficiency of each DNA DSB repair pathways has not been previously evaluated. METHODS AND
resultsUsing DNA DSB repair assays, we evaluated the efficiency of specific repair pathways, and found that PR, GR and GA decrease the efficiency of non-homologous end joining (NHEJ), single strand annealing (SSA), and microhomology-mediated end joining (MMEJ), but not homologous recombination (HR). We found that PR inhibits DNA DSB repair, in part, by binding to the nucleolar protein nucleophosmin (NPM1). Depletion of NPM1 inhibited NHEJ and SSA, suggesting that NPM1 loss-of-function in PR expressing cells leads to impediments of both non-homologous and homology-directed DNA DSB repair pathways. By deleting NPM1 sub-cellular localization signals, we found that PR binds NPM1 regardless of the cellular compartment to which NPM1 was directed. Deletion of the NPM1 acidic loop motif, known to engage other arginine-rich proteins, abrogated PR and NPM1 binding. Using confocal and super-resolution immunofluorescence microscopy, we found that levels of RAD52, a component of the SSA repair machinery, were significantly increased iPSC neurons relative to isogenic controls in which the C9ORF72 expansion had been deleted using CRISPR/Cas9 genome editing. Western analysis of post-mortem brain tissues confirmed that RAD52 immunoreactivity is significantly increased in C9ALS/FTD samples as compared to controls.
conclusionsCollectively, we characterized the inhibitory effects of DPRs on key DNA DSB repair pathways, identified NPM1 as a facilitator of DNA repair that is inhibited by PR, and revealed deficits in homology-directed DNA DSB repair pathways as a novel feature of C9ORF72-related disease.
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