Wild type p53 can mediate sequence-specific transactivation of an internal promoter within the mdm2 gene

Tamar Juven, Yaacov Barak, Arie Zauberman, Donna L. George, Moshe Oren

Research output: Contribution to journalArticlepeer-review

367 Scopus citations

Abstract

The p53 tumor suppressor gene product can complex with polypeptides encoded by the mdm2 putative protooncogene. In addition, mdm2 mRNA levels have been shown to increase following the activation of wild type (wt) p53.To determine the basis for the effect of wt p53 on mdm2 mRNA, we studied the interaction of the mdm2 gene with p53. We report that wt p53 can bind sequence-specifically to a DNA region residing downstream to exon 1 of the mdm2 gene. This is correlated with a pronounced p53-dependent transcriptional activation. Efficient p53-dependent transactivation can be obtained with an mdm2 genomic DNA fragment lacking the putative mdm2 promoter. These findings suggest that p53 can induce transcription from an internal promoter located within the mdm2 gene. These findings raise the possibility that, in addition to increasing the overall levels of mdm2 mRNA, wt p53 may also modulate the repertoire of mdm2 transcripts present within the cell.

Original languageEnglish
Pages (from-to)3411-3416
Number of pages6
JournalOncogene
Volume8
Issue number12
StatePublished - Dec 1993
Externally publishedYes

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