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G2 damage checkpoints: what is the turn-on?

Matthew J O'Connell1, Karlene A Cimprich

  • 1Department of Oncological Sciences, Mount Sinai School of Medicine, One Gustave L. Levy Place, Box 1130, New York, NY 10029, USA. matthew.oconnell@mssm.edu

Journal of Cell Science
|December 24, 2004
PubMed
Summary

Cells activate DNA repair and cell-cycle checkpoints upon DNA damage. The p53-independent pathway, crucial in G2, uses ATR kinase signaling to halt cell division, preventing further damage.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Cells possess coordinated responses to DNA damage, involving DNA repair and cell-cycle checkpoints.
  • Checkpoint responses in human cells are categorized into p53-dependent and p53-independent pathways.
  • The p53-independent pathway is predominant in the G2 phase of the cell cycle.

Purpose of the Study:

  • To elucidate the mechanisms by which ATM and ATR kinases recognize DNA damage and activate the p53-independent checkpoint pathway.
  • To understand the role of single-stranded DNA in ATR activation.
  • To detail the signaling cascade leading to G2 arrest.

Main Methods:

  • Investigating the role of ATR and ATM kinases in DNA damage response.
  • Analyzing the involvement of single-stranded DNA (ssDNA) in checkpoint activation.
  • Studying the phosphorylation cascade involving ATR, Chk1, and Cdc2.

Main Results:

  • Single-stranded DNA is central to ATR activation, recruiting checkpoint protein complexes.
  • ATR phosphorylates Chk1, activating it to induce G2 arrest.
  • This pathway enforces a block to mitotic entry, allowing time for DNA repair.

Conclusions:

  • The ATR-Chk1 signaling pathway is a key component of the p53-independent DNA damage response in G2 phase.
  • Recognition of ssDNA by ATR is a critical step in initiating the checkpoint.
  • This mechanism ensures genomic stability by preventing cell division with damaged DNA.

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