Gene Set: ONGUSAHA_BRCA1_TARGETS_DN

Standard name ONGUSAHA_BRCA1_TARGETS_DN
Systematic name M2068
Brief description Genes down-regulated in MEF cells (embryonic fibroblast) lacking TP53 and BRCA1 [GeneID=7157;672] by expression of BRCA1.
Full description or abstract The tumor suppressor protein BRCA1 has been shown to enhance p53 transcription, whereas activated p53 represses BRCA1 transcription. To further understand the functional interaction of these proteins, we investigated the role of BRCA1 in p53-induced phenotypes. We found that BRCA1 when subjected to forced expression acts synergistically with wild-type p53, resulting in irreversible growth arrest, as shown by VhD mouse fibroblast cells expressing a temperature-sensitive mutant of p53. Furthermore, reintroduction of both BRCA1 and p53 into BRCA1(-/-)/p53(-/-) mouse embryonic fibroblasts markedly increased the senescence phenotype compared to that induced by p53 alone. In particular, we found that BRCA1 expression attenuated p53-mediated cell death in response to gamma-irradiation. Moreover, microarray screening of 11 000 murine genes demonstrated that a set of genes upregulated by p53 is enhanced by coexpression of BRCA1 and p53, suggesting that BRCA1 and p53 exert a promoter selectivity leading to a specific phenotype. Taken together, our results provide evidence that BRCA1 is involved in p53-mediated growth suppression rather than apoptosis.
Collection C2: curated gene sets
      CGP: chemical and genetic perturbations
Source publication Pubmed 12802282   Authors: Ongusaha PP,Ouchi T,Kim KT,Nytko E,Kwak JC,Duda RB,Deng CX,Lee SW
Exact source Table 2: Downregulated genes
Related gene sets (show 2 additional gene sets from the source publication)
External links  
Organism Mus musculus
Contributed by Arthur Liberzon (Broad Institute)
Source platform SEQ_ACCESSION
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Compendia expression profiles Human tissue compendium (Novartis)
NCI-60 cell lines (National Cancer Institute)
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Version history 3.1: First introduced

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