ATR-ATRIP kinase complex triggers activation of the Fanconi anemia DNA repair pathway

Related Experiment Video

Updated: May 25, 2026

Detection and Visualization of DNA Damage-induced Protein Complexes in Suspension Cell Cultures Using the Proximity Ligation Assay
13:10

Detection and Visualization of DNA Damage-induced Protein Complexes in Suspension Cell Cultures Using the Proximity Ligation Assay

Published on: June 9, 2017

Tomoko Shigechi1, Junya Tomida, Koichi Sato

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

Cancer Research
|January 20, 2012
PubMed

Insights

This study reveals that ATR kinase directly activates the Fanconi anemia (FA) DNA repair pathway by phosphorylating FANCI. This essential DNA damage response is crucial for restarting replication after DNA damage.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • ATR kinase regulates the S-phase checkpoint during DNA replication stress.
  • The Fanconi anemia (FA) pathway is critical for repairing DNA damage and restarting replication.
  • The precise interaction between ATR and the FA pathway was previously undefined.

Purpose of the Study:

  • To elucidate the direct link between ATR kinase and the Fanconi anemia (FA) pathway.
  • To identify the role of ATRIP in DNA damage response signaling.
  • To determine the kinase responsible for activating the FA pathway.

Main Methods:

  • Utilized a DT40 mutant cell line conditionally deficient in ATRIP.
  • Investigated DNA damage-induced FANCD2 monoubiquitination and FANCI phosphorylation.
  • Performed in vitro kinase assays with recombinant FANCI and FANCD2 proteins.

Main Results:

  • ATRIP is essential for DNA damage-induced FANCD2 monoubiquitination and FANCI phosphorylation.
  • ATR kinase directly phosphorylates FANCI in vitro, a process facilitated by FANCD2.
  • Specific domains of ATRIP are differentially required for FANCD2 monoubiquitination and Chk1 phosphorylation.

Conclusions:

  • ATR kinase is the key kinase that activates the Fanconi anemia (FA) DNA repair pathway.
  • This study establishes a direct mechanistic link between ATR signaling and FA pathway activation.
  • Findings clarify a critical step in DNA repair and replication restart.

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