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The G(2) checkpoint is maintained by redundant pathways.

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Area of Science:

  • Cell cycle regulation
  • DNA damage response
  • Tumor suppressor function

Background:

  • p53 is crucial for the G1 checkpoint after DNA damage.
  • The role of p53 in the G2 checkpoint is less clear, as p53-deficient cells can still arrest in G2.

Purpose of the Study:

  • To investigate the role of p53 in maintaining the G2 checkpoint following DNA damage.
  • To compare G2 checkpoint function in normal human foreskin fibroblasts (HFFs) versus p53-deficient HFFs.

Main Methods:

  • Comparison of normal HFFs and HFFs lacking p53 (via E6 transduction).
  • Treatment with adriamycin to induce DNA damage.
  • Analysis of G2 arrest, cyclin B/CDC2 kinase activity, and promoter activity.

Main Results:

  • Adriamycin induced G2 arrest with active cyclin B/CDC2 kinase in both normal and p53-deficient HFFs.
  • Normal HFFs with functional p53 downregulated cyclin B/CDC2 kinase activity via p53-dependent repression of CDC2 and cyclin B promoters.
  • p53-deficient HFFs maintained high cyclin B/CDC2 kinase activity and showed attenuated G2 arrest with aging, eventually entering mitosis after DNA damage.
  • p53-deficient cells at late passage entered mitosis post-DNA damage, unlike age-matched controls.

Conclusions:

  • Normal cells possess p53-independent pathways for DNA damage-induced G2 arrest.
  • p53-dependent functions may augment G2 arrest.
  • Loss of p53 increases the risk of aneuploidy due to impaired G2 checkpoint maintenance.