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A novel interplay between the Fanconi anemia core complex and ATR-ATRIP kinase during DNA cross-link repair

Junya Tomida1, Akiko Itaya, Tomoko Shigechi

  • 1Department of Late Effects Studies, Laboratory of DNA Damage Signaling, Kyoto University, Kyoto 606-8501, Japan, Japan Society for the Promotion of Science (JSPS), Tokyo 102-0083, Japan.

Nucleic Acids Research
|June 1, 2013
PubMed

Insights

The Fanconi anemia (FA) core complex enhances DNA repair by aiding ATR-ATRIP kinase localization to damaged DNA. This coordination is crucial for cellular response to genomic stress and DNA damage.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Genetics

Background:

  • DNA damage triggers cellular responses to halt cell cycle and repair DNA.
  • The Ataxia teleangiectasia and Rad3 related (ATR) kinase pathway and the Fanconi anemia (FA) pathway are critical for genomic stability.
  • Coordination between ATR-ATRIP and FA pathways remains poorly understood.

Purpose of the Study:

  • To elucidate the interplay between the ATR-ATRIP kinase pathway and the Fanconi anemia (FA) pathway.
  • To investigate how the FA pathway influences ATR-ATRIP activation following DNA damage.

Main Methods:

  • Exposure of cells to DNA cross-linking agents.
  • Chromatin immunoprecipitation to assess protein localization.
  • Analysis of protein phosphorylation in wild-type and mutant cells.
  • Sensitivity assays in gene-deficient cell lines.

Main Results:

  • The FA core complex promotes ATR-Interacting Protein (ATRIP) binding and localization to damaged chromatin.
  • ATR-mediated phosphorylation of ATRIP and FANCI is impaired in cells lacking the FA core complex.
  • The canonical ATR activation pathway (RAD17/TOPBP1) is not essential for FA pathway activation.
  • Cells deficient in both RAD17 and FANCD2 exhibit synergistic sensitivity to cisplatin.

Conclusions:

  • The FA core complex plays a regulatory role in ATR-ATRIP kinase activation at sites of DNA damage.
  • This study reveals novel mechanisms coordinating ATR and FA pathway responses to DNA damage.
  • Findings highlight the intricate crosstalk essential for maintaining genomic integrity.

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