Differential effects of p63 mutants on transactivation of p53 and/or p63 responsive genes

Shama K. Khokhar, Ramakrishna Kommagani, Madhavi P. Kadakia

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

p63, known to play a role in development, has more recently also been implicated in cancer progression. Mutations in p63 have been shown to be responsible for several human developmental diseases. Differential splicing of the p63 gene gives rise to p63 isoforms, which can act either as tumor suppressors or as oncogene. In this report, we studied the effects of naturally occurring TAp63γ mutants on the regulation of p53/p63 and p63 specific target genes. We observed significant differences among p63 mutants to regulate the p53/p63 and p63 specific target genes. Additionally, we observed a differential effect of p63 mutants on wildtype-p63-mediated induction of p53/p63 and p63 specific target genes. We also demonstrated that these mutants differentially regulate the binding of wildtype p63 to the promoter of target genes. Furthermore, the effects of these mutants on cell death and survival were consistent with their ability to regulate the downstream targets when compared to wildtype TAp63γ. In summary, our data demonstrate that p63 mutants exhibit differential effects on p63 and p53/p63 specific target genes and on the induction of apoptosis, and provide further insight into the function of p63.

Original languageEnglish
Pages (from-to)1061-1073
Number of pages13
JournalCell Research
Volume18
Issue number10
DOIs
StatePublished - Oct 2008

Keywords

  • Hdm2
  • P21
  • P63 mutants
  • Shh
  • VDR

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