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. 1992 Aug 11;20(15):4083–4087. doi: 10.1093/nar/20.15.4083

Repression of the basal c-fos promoter by wild-type p53.

N Kley 1, R Y Chung 1, S Fay 1, J P Loeffler 1, B R Seizinger 1
PMCID: PMC334091  PMID: 1508692

Abstract

Mutations in the p53 gene are the most common genetic alterations observed in many inherited and sporadic forms of human cancer. Recent studies indicate that wild-type p53 may be involved in the regulation of gene expression. In the present report we examined the effect of p53 on the human c-fos promoter. Using a transient co-transfection assay we show that wild-type human p53, but not a transforming mutant of p53, negatively regulates the activity of the c-fos promoter in a dose-dependent manner. Promoter deletion analysis maps a sequence conferring p53 repression to the basal promoter region between nucleotides -53 and +42 relative to the cap site. In contrast, p53 strongly stimulates transcription when a sequence previously reported to bind p53 (TGCCT repeat) was inserted in front of the HSV-TK promoter driving CAT. These findings raise the question as to whether p53 may mediate its inhibitory effect on c-fos gene expression by interfering, directly or indirectly, with components of the basal transcriptional machinery.

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