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NFBD1/Mdc1 mediates ATR-dependent DNA damage response.

Aimin Peng1, Phang-Lang Chen

  • 1Department of Molecular Medicine and Institute of Biotechnology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA.

Cancer Research
|March 1, 2005
PubMed
Summary

Human DNA repair proteins 53BP1 and NFBD1 are essential for recruiting ATR kinase to DNA damage sites, independent of single-stranded DNA generation. This clarifies their role in early DNA damage response pathways.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Budding yeast Rad9 (scRad9) mediates Mec1-dependent phosphorylation by recruiting downstream substrates.
  • Human orthologues 53BP1 and NFBD1 localize to ionizing radiation-induced foci (IRIF) at DNA repair sites.
  • Gene silencing of 53BP1 or NFBD1 impairs ATM/ATR substrate phosphorylation and checkpoint activation, indicating roles in DNA damage signaling.

Purpose of the Study:

  • To investigate whether 53BP1 and NFBD1 are required for kinase activation or substrate recruitment at IRIF.
  • To elucidate the precise function of 53BP1 and NFBD1 in the DNA damage response pathway.

Main Methods:

  • RNA interference (RNAi) for gene silencing of 53BP1 and NFBD1.
  • Analysis of phosphorylation of ATM/ATR substrates at IRIF.

Related Experiment Videos

  • Assessment of ATR recruitment to DNA damage sites.
  • Investigation of NFBD1 recruitment in relation to single-stranded DNA (ssDNA) generation and RPA coating.

    • Main Results:

    • Both 53BP1 and NFBD1 are required for the recruitment of ATR (ataxia-telangiectasia and Rad3-related) to DNA damage sites.
    • ATR-dependent phosphorylation in response to DNA damage requires 53BP1 and NFBD1.
    • NFBD1 recruitment to DNA damage sites is independent of ssDNA generation and replication protein A (RPA) coating.
    • ssDNA generation and RPA coating play critical roles in regulating the ATR-dependent pathway.

    Conclusions:

    • 53BP1 and NFBD1 act upstream of ATR recruitment, independent of ssDNA generation.
    • These findings clarify the early steps of DNA damage response mediated by NFBD1 and 53BP1.
    • The study highlights the distinct roles of ssDNA/RPA and 53BP1/NFBD1 in ATR pathway regulation.