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Distinct p53 transcriptional programs dictate acute DNA-damage responses and tumor suppression.

The molecular basis for p53-mediated tumor suppression remains unclear. Here, to elucidate mechanisms of p53 tumor suppression, we use knockin mice expressing an allelic series of p53 transcriptional activation mutants. Microarray analysis reveals that one mutant, p53(25,26), is severely compromised for transactivation of most p53 target genes, and, moreover, p53(25,26) cannot induce G(1)-arrest or apoptosis in response to acute DNA damage. Surprisingly, p53(25,26) retains robust activity in senescence and tumor suppression, indicating that efficient transactivation of the majority of known p53 targets is dispensable for these pathways. In contrast, the transactivation-dead p53(25,26,53,54) mutant cannot induce senescence or inhibit tumorigenesis, like p53 nullizygosity. Thus, p53 transactivation is essential for tumor suppression but, intriguingly, in association with a small set of novel p53 target genes. Together, our studies distinguish the p53 transcriptional programs involved in acute DNA-damage responses and tumor suppression-a critical goal for designing therapeutics that block p53-dependent side effects of chemotherapy without compromising p53 tumor suppression.

Pubmed ID: 21565614


  • Brady CA
  • Jiang D
  • Mello SS
  • Johnson TM
  • Jarvis LA
  • Kozak MM
  • Kenzelmann Broz D
  • Basak S
  • Park EJ
  • McLaughlin ME
  • Karnezis AN
  • Attardi LD



Publication Data

May 13, 2011

Associated Grants

  • Agency: NCI NIH HHS, Id: CA140875
  • Agency: NCI NIH HHS, Id: R01 CA140875
  • Agency: NCI NIH HHS, Id: R01 CA140875-02
  • Agency: NCI NIH HHS, Id: R21 CA141087
  • Agency: NCI NIH HHS, Id: R21 CA141087-02

Mesh Terms

  • Animals
  • Apoptosis
  • Cell Aging
  • Cell Cycle
  • DNA Damage
  • DNA Repair
  • Gene Knock-In Techniques
  • Humans
  • Mice
  • Mutation
  • Neoplasms
  • Protein Structure, Tertiary
  • Transcriptional Activation
  • Tumor Suppressor Protein p53