Cited by 69Amyotrophic Lateral Sclerosis ResearchDNA Repair MechanismsAlzheimer's disease research and treatments

Amyotrophic lateral sclerosis-associated TDP-43 mutation Q331K prevents nuclear translocation of XRCC4-DNA ligase 4 complex and is linked to genome damage-mediated neuronal apoptosis

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Guerrero, Erika N, Mitra, Joy, Wang, Haibo, Rangaswamy, Suganya, Hegde, Pavana M, Basu, Priyadarshini, Rao, K S, Hegde, Muralidhar L·2019·Human Molecular Genetics

Abstract

Dominant mutations in the RNA/DNA-binding protein TDP-43 have been linked to amyotrophic lateral sclerosis (ALS). Here, we screened genomic DNA extracted from spinal cord specimens of sporadic ALS patients for mutations in the TARDBP gene and identified a patient specimen with previously reported Q331K mutation. The patient spinal cord tissue with Q331K mutation showed accumulation of higher levels of DNA strand breaks and the DNA double-strand break (DSB) marker γH2AX, compared to age-matched controls, suggesting a role of the Q331K mutation in genome-damage accumulation. Using conditional SH-SY5Y lines ectopically expressing wild-type (WT) or Q331K-mutant TDP-43, we confirmed the increased cytosolic sequestration of the poly-ubiquitinated and aggregated form of mutant TDP-43, which correlated with increased genomic DNA strand breaks, activation of the DNA damage response factors phospho-ataxia-telangiectasia mutated (ATM), phospho-53BP1, γH2AX and neuronal apoptosis. We recently reported the involvement of WT TDP-43 in non-homologous end joining (NHEJ)-mediated DSB repair, where it acts as a scaffold for the recruitment of XRCC4-DNA ligase 4 complex. Here, the mutant TDP-43, due to its reduced interaction and enhanced cytosolic mislocalization, prevented the nuclear translocation of XRCC4-DNA ligase 4. Consistently, the mutant cells showed significantly reduced DNA strand break sealing activity and were sensitized to DNA-damaging drugs. In addition, the mutant cells showed elevated levels of reactive oxygen species, suggesting both dominant negative and loss-of-function effects of the mutation. Together, our study uncovered an association of sporadic Q331K mutation with persistent genome damage accumulation due to both damage induction and repair defects.

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  • TDP-43 is directly involved in NHEJ through its recruitment and stabilization of the XRCC4-LIG4 complex at DSBs.

    “Recently, TDP‐43 was also found to be directly involved in NHEJ through its recruitment and stabilization of the XRCC4‐LIG4 complex at DSBs (Guerrero et al, 2019; Mitra et al, 2019).”

    From Mechanisms of DNA damage-mediated neurotoxicity in neurodegenerative disease (2022) · cites this paper as Guerrero et al, 2019

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Authors
Guerrero, E. N., Mitra, J., Wang, H., Rangaswamy, S., Hegde, P. M., Basu, P., Rao, K. S., & Hegde, M. L.
Affiliations
  • Houston Methodist (US)
  • Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (PA)
Corresponding author
Hegde, Muralidhar L
Venue
Human Molecular Genetics
Published
2019-04-01
Volume
28
Issue
15
Pages
2459-2476
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2933044054
Cited by
68
References
45
Citations by year
2026: 6 · 2025: 8 · 2024: 7 · 2023: 6 · 2022: 14 · 2021: 13 · 2020: 8 · 2019: 6
FWCI
6.94
Type
journal article
Language
en
Open access
Locations
  • Human Molecular Genetics (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Neurological Disorders and Stroke (R01 NS088645)
  • Muscular Dystrophy Association (MDA 294842)
  • California Health Care Safety Net Institute
  • Secretarí Nacional de Ciencia, Tecnologí e Innovación
Topics
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
amyotrophic lateral sclerosis, TDP-43, TARDBP, non-homologous end joining, DNA double-strand break repair, DNA damage response, neuronal apoptosis, γH2AX, ATM, 53BP1, reactive oxygen species, dominant negative mutation, DNA strand breaks, sporadic ALS
MeSH terms
DNA Ligase ATP, Amyotrophic Lateral Sclerosis, Cell Line, DNA, DNA Repair, DNA-Binding Proteins, Humans, Mutation, Neurons, Spinal Cord, Translocation, Genetic, RNA-Binding Proteins, Apoptosis, Polymorphism, Single Nucleotide, DNA Breaks, Double-Stranded

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