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ATR-dependent phosphorylation of FANCM at serine 1045 is essential for FANCM functions

Thiyam Ramsing Singh1, Abdullah Mahmood Ali, Manikandan Paramasivam

  • 1Division of Experimental Hematology & Cancer Biology and Cancer & Blood Diseases Institute, Cincinnati Children's Hospital Medical Center; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH 45229, USA.

Cancer Research
|May 24, 2013
PubMed

Insights

Fanconi anemia (FA) involves genome instability. This study reveals that ATR-dependent phosphorylation of FANCM (a key protein) is crucial for DNA repair and cell cycle control during replication stress.

Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • Fanconi anemia (FA) is a genome instability disorder linked to cancer and bone marrow failure.
  • FA proteins regulate the cellular response to replication stress, coordinating DNA repair with replication and cell cycle progression.
  • FANCM, an ATP-dependent DNA translocase, is a key regulator of this stress response and is known to be hyperphosphorylated.

Purpose of the Study:

  • To elucidate the significance of genotoxic stress-induced FANCM phosphorylation.
  • To identify the specific site of FANCM phosphorylation and its functional consequences.
  • To investigate the role of FANCM phosphorylation in the Fanconi anemia pathway and replication stress response.

Main Methods:

  • Investigated the ATR-dependence of FANCM phosphorylation.
  • Identified the specific serine residue (S1045) phosphorylated upon genotoxic stress.
  • Assessed the functional impact of S1045 phosphorylation on FANCM's role in DNA repair and checkpoint activation.

Main Results:

  • Genotoxic stress induces ATR-dependent phosphorylation of FANCM at serine 1045 (S1045).
  • S1045 phosphorylation is essential for FANCM's function in maintaining FA pathway integrity.
  • This phosphorylation is critical for recruiting FANCM to DNA damage sites, preventing premature mitosis, and activating CHK1 and G2-M checkpoints.

Conclusions:

  • An ATR-FANCM feedback loop exists within the FA and replication stress response pathways.
  • This feedback loop is vital for effective ATR/CHK1 checkpoint activation and optimal FANCM function.
  • FANCM phosphorylation at S1045 is a key regulatory mechanism in maintaining genomic stability.

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