Cited by 506DNA Repair MechanismsEffects of Radiation ExposureCancer-related Molecular Pathways

MDC1 is required for the intra-S-phase DNA damage checkpoint

Goldberg, Michal, Stucki, Manuel, Falck, Jacob, D'Amours, Damien, Rahman, Dinah, Pappin, Darryl, Bartek, Jiri, Jackson, Stephen P.·2003·Nature

Abstract

MRE11, RAD50 and NBS1 form a highly conserved protein complex (the MRE11 complex) that is involved in the detection, signalling and repair of DNA damage. We identify MDC1 (KIAA0170/NFBD1), a protein that contains a forkhead-associated (FHA) domain and two BRCA1 carboxy-terminal (BRCT) domains, as a binding partner for the MRE11 complex. We show that, in response to ionizing radiation, MDC1 is hyperphosphorylated in an ATM-dependent manner, and rapidly relocalizes to nuclear foci that also contain the MRE11 complex, phosphorylated histone H2AX and 53BP1. Downregulation of MDC1 expression by small interfering RNA yields a radio-resistant DNA synthesis (RDS) phenotype and prevents ionizing radiation-induced focus formation by the MRE11 complex. However, downregulation of MDC1 does not abolish the ionizing radiation-induced phosphorylation of NBS1, CHK2 and SMC1, or the degradation of CDC25A. Furthermore, we show that overexpression of the MDC1 FHA domain interferes with focus formation by MDC1 itself and by the MRE11 complex, and induces an RDS phenotype. These findings reveal that MDC1-mediated focus formation by the MRE11 complex at sites of DNA damage is crucial for the efficient activation of the intra-S-phase checkpoint.

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Crossref · 10.1038/nature01445

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  • MDC1 is a binding partner of the MRN nuclease complex and functions in the initial detection and signaling of DSBs.

    “MDC1 is a binding partner of the MRN nuclease complex (Goldberg et al., 2003) and functions in the initial detection and signaling of DSBs (Stewart et al., 2003).”

    From USP7 Is a Master Regulator of Genome Stability (2020) · cites this paper as Goldberg et al., 2003

  • MDC1 is phosphorylated by ATM and relocalizes to damage sites containing MRN, γ-H2AX, and 53BP1, and it is indispensable for the ATM-dependent DNA damage checkpoint.

    “With a forkhead-associated (FHA) domain and two BRCT domains, MDC1 is phosphorylated by ATM and relocalizes to damage sites that contain the MRN complex, γ-H2AX, and 53BP1, thereby playing an indispensable role in ATM-dependent DNA damage checkpoint [61].”

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Authors
Goldberg, M., Stucki, M., Falck, J., D'Amours, D., Rahman, D., Pappin, D., Bartek, J., & Jackson, S. P.
Affiliations
  • University of Cambridge (GB)
  • Danish Cancer Society (DK)
  • Imperial College London (GB)
Corresponding author
Jackson, Stephen P.
Venue
Nature
Published
2003-02
Volume
421
Issue
6926
Pages
952-956
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2077709632
Cited by
506
References
4
Citations by year
2026: 4 · 2025: 5 · 2024: 6 · 2023: 8 · 2022: 11 · 2021: 7 · 2020: 10 · 2019: 11 · 2018: 15 · 2017: 13 · 2016: 13 · 2015: 15 · 2014: 23 · 2013: 20 · 2012: 28
FWCI
16.55
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Cold Spring Harbor Laboratory Institutional Repository (Cold Spring Harbor Laboratory) (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Effects of Radiation Exposure
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
Keywords
MDC1, Mre11 complex, S-phase checkpoint, DNA damage checkpoint, ionizing radiation, ATM phosphorylation, radioresistance (biology), DNA repair, nuclear foci, BRCT domain, FHA domain, 53BP1, H2AX phosphorylation, Chk2, SMC1A, NBS1
MeSH terms
MRE11 Homologue Protein, Structural Maintenance of Chromosome Protein 1, Animals, Cell Line, Chromosomal Proteins, Non-Histone, DNA Damage, DNA-Binding Proteins, Humans, Nuclear Proteins, Phosphorylation, Protein Kinases, Radiation, Ionizing, Tumor Cells, Cultured, Trans-Activators, S Phase, Protein Serine-Threonine Kinases, Protein Structure, Tertiary, Cell Cycle Proteins, cdc25 Phosphatases, DNA Repair Enzymes, Adaptor Proteins, Signal Transducing, Mice, Checkpoint Kinase 2

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