Cited by 289DNA Repair MechanismsEffects of Radiation ExposureDNA and Nucleic Acid Chemistry

The MRN complex: coordinating and mediating the response to broken chromosomes

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van den Bosch, Michael, Bree, Ronan T, Lowndes, Noel F·2003·The EMBO Reports

Abstract

The MRE11-RAD50-NBS1 (MRN) protein complex has been linked to many DNA metabolic events that involve DNA double-stranded breaks (DSBs). In vertebrate cells, all three components are encoded by essential genes, and hypomorphic mutations in any of the human genes can result in genome-instability syndromes. MRN is one of the first factors to be localized to the DNA lesion, where it might initially have a structural role by tethering together, and therefore stabilizing, broken chromosomes. This suggests that MRN could function as a lesion-specific sensor. As well as binding to DNA, MRN has other roles in both the processing and assembly of large macromolecular complexes (known as foci) that facilitate efficient DSB responses. Recently, a novel mediator protein, mediator of DNA damage checkpoint protein 1 (MDC1), was shown to co-immunoprecipitate with the MRN complex and regulate MRE11 foci formation. However, whether the initial recruitment of MRN to DSBs requires MDC1 is unclear. Here, we focus on recent developments in MRN research and propose a model for how DSBs are sensed and the cellular responses to them are mediated.

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Authors
van den Bosch, M., Bree, R. T., & Lowndes, N. F.
Affiliations
Ollscoil na Gaillimhe – University of Galway (IE)
Corresponding author
Lowndes, Noel F
Venue
The EMBO Reports
Published
2003-09-01
Volume
4
Issue
9
Pages
844-849
ISSN
  • 1469-221X (ISSN-L)
  • 1469-3178
OpenAlex
W2000752368
Cited by
289
References
48
Citations by year
2026: 2 · 2025: 3 · 2024: 5 · 2023: 11 · 2022: 6 · 2021: 15 · 2020: 16 · 2019: 8 · 2018: 9 · 2017: 7 · 2016: 9 · 2015: 7 · 2014: 15 · 2013: 13 · 2012: 14
FWCI
1.55
Type
journal article
Language
en
Open access
Locations
  • EMBO Reports (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Arrow@dit (Dublin Institute of Technology) (submittedVersion)
  • ARAN (University of Galway Research Repository) (Ollscoil na Gaillimhe – University of Galway) (submittedVersion, cc-by-nc-nd)
Funders
  • Health Research Board
  • Higher Education Authority
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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
Keywords
MRN complex, MRE11, RAD50, NBS1, DNA double-strand breaks, DNA damage response, MDC1, genomic instability, DNA damage checkpoint
MeSH terms
MRE11 Homologue Protein, Animals, Chromosome Aberrations, DNA Damage, DNA Repair, DNA-Binding Proteins, Humans, Nuclear Proteins, Protein Serine-Threonine Kinases, Acid Anhydride Hydrolases, Cell Cycle Proteins, Tumor Suppressor Proteins, DNA Repair Enzymes, Ataxia Telangiectasia Mutated Proteins

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