A microRNA component of the p53 tumour suppressor network

Nature. 2007 Jun 28;447(7148):1130-4. doi: 10.1038/nature05939. Epub 2007 Jun 6.


A global decrease in microRNA (miRNA) levels is often observed in human cancers, indicating that small RNAs may have an intrinsic function in tumour suppression. To identify miRNA components of tumour suppressor pathways, we compared miRNA expression profiles of wild-type and p53-deficient cells. Here we describe a family of miRNAs, miR-34a-c, whose expression reflected p53 status. Genes encoding miRNAs in the miR-34 family are direct transcriptional targets of p53, whose induction by DNA damage and oncogenic stress depends on p53 both in vitro and in vivo. Ectopic expression of miR-34 induces cell cycle arrest in both primary and tumour-derived cell lines, which is consistent with the observed ability of miR-34 to downregulate a programme of genes promoting cell cycle progression. The p53 network suppresses tumour formation through the coordinated activation of multiple transcriptional targets, and miR-34 may act in concert with other effectors to inhibit inappropriate cell proliferation.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Cycle / genetics*
  • Cell Division / genetics
  • Cell Line
  • DNA Damage
  • Gene Expression Regulation*
  • Mice
  • MicroRNAs / genetics*
  • MicroRNAs / metabolism*
  • Substrate Specificity
  • Transcription, Genetic
  • Tumor Suppressor Protein p53 / metabolism*


  • MicroRNAs
  • Tumor Suppressor Protein p53