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FANCD2 binds CtIP and regulates DNA-end resection during DNA interstrand crosslink repair

Junya Unno1, Akiko Itaya2, Masato Taoka3

  • 1Laboratory of DNA Damage Signaling, Department of Late Effects Studies, Radiation Biology Center, Kyoto University, Kyoto 606-8501, Japan.

Cell Reports
|May 6, 2014
PubMed

Insights

The Fanconi anemia (FA) pathway is crucial for stem cell maintenance and cancer prevention. This study reveals that CtIP protein binding to FANCD2 is essential for DNA repair mechanisms following DNA damage.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The Fanconi anemia (FA) pathway is vital for maintaining genomic stability and hematopoietic stem cells.
  • It plays a critical role in suppressing cancer development.
  • The precise mechanisms by which FA proteins coordinate DNA repair, particularly FANCD2, remain incompletely understood.

Purpose of the Study:

  • To elucidate the interaction between CtIP and FANCD2 in the context of DNA interstrand crosslink (ICL) repair.
  • To investigate the functional significance of the FANCD2-CtIP complex in DNA damage response pathways.

Main Methods:

  • Co-immunoprecipitation assays to confirm direct interaction between CtIP and FANCD2.
  • Mitomycin C (MMC) treatment to induce DNA interstrand crosslinks and DNA damage response.
  • Immunofluorescence microscopy to detect CtIP foci formation.
  • Western blotting to assess RPA2 hyperphosphorylation as a marker of end resection.

Main Results:

  • CtIP directly interacts with the monoubiquitinated form of FANCD2.
  • A specific region of CtIP (amino acids 166-273) and FANCD2 monoubiquitination are essential for this interaction and CtIP foci formation upon MMC treatment.
  • Both FANCD2 and CtIP are critical for MMC-induced RPA2 hyperphosphorylation, indicating their role in DNA double-strand break end resection.

Conclusions:

  • Monoubiquitinated FANCD2 directly binds to CtIP, forming a complex crucial for DNA repair.
  • This FANCD2-CtIP interaction is essential for the end resection step during the repair of DNA interstrand crosslinks.
  • The findings reveal a novel role for FANCD2 in coordinating DNA repair pathways through its interaction with CtIP.

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