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ZFIN ID: ZDB-PUB-040304-1
Identification of p53 regulators by genome-wide functional analysis
Huang, Q., Raya, A., DeJesus, P., Chao, S.H., Quon, K.C., Caldwell, J.S., Chanda, S.K., Izpisúa Belmonte, J.C., and Schultz, P.G.
Date: 2004
Source: Proceedings of the National Academy of Sciences of the United States of America   101(10): 3456-3461 (Journal)
Registered Authors: Izpisúa Belmonte, Juan Carlos, Raya, Angel
Keywords: none
MeSH Terms:
  • Animals
  • Apoptosis
  • Basic Helix-Loop-Helix Transcription Factors
  • Cell Line
  • Cell Transformation, Neoplastic
  • Chick Embryo
  • DNA, Complementary/genetics
  • Gene Expression Regulation
  • Genes, p53*
  • Homeodomain Proteins/genetics
  • Homeodomain Proteins/metabolism
  • Mice
  • Phenotype
  • Protein Processing, Post-Translational
  • Repressor Proteins/genetics
  • Repressor Proteins/metabolism
  • Transcription Factors/genetics
  • Transcription Factors/metabolism
  • Transcription, Genetic
  • Tumor Suppressor Protein p53/genetics*
  • Tumor Suppressor Protein p53/metabolism*
  • Zebrafish
PubMed: 14990790 Full text @ Proc. Natl. Acad. Sci. USA
The p53 tumor-suppressor protein is a critical mediator of cellular growth arrest and the induction of apoptosis. To identify proteins involved in the modulation of p53 transcriptional activity, a gain-of-function cellular screen was carried out with an arrayed matrix of approximately 20,000 cDNAs. Nine genes previously unknown to be involved in regulating p53 activity were identified. Overexpression of seven of these genes (Hey1, Hes1, TFAP4, Osr1, NR2F2, SFRS10, and FLJ11339) resulted in up-regulation of p53 activity; overexpression of two genes (M17S2 and cathepsin B) resulted in down-regulation of p53 activity in mammalian cells. HES1, HEY1, and TFAP4, which are members of the basic helix-loop-helix transcription family, and OSR1 were shown to activate p53 through repression of HDM2 transcription. Ectopic expression of these basic helix-loop-helix transcription factors in both zebrafish and avian developmental systems activated p53 and induced apoptosis in vivo, resulting in a phenotype similar to that of p53 overexpression. Furthermore, ras- and myc-mediated transformation of mouse embryonic fibroblasts was abrogated by expression of HEY1 in a p53-dependent manner. These results suggest that these transcription factors are members of an evolutionarily conserved network that governs p53 function.