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Papers In Press, published online ahead of print June 23, 2006
Molecular Pathology, UT MD Anderson Cancer Center, Houston, TX 77030
Corresponding Author: tmcdonne{at}mdanderson.org
Historically, most studies attribute p53 function to the transactivation of target genes. That p53 can selectively repress genes to affect a cellular response is less widely appreciated. Available evidence suggests that repression is important for p53-induced apoptosis and cell cycle arrest. To better establish the scope of p53-repressed target genes, and cellular processes they may affect, a global expression profiling strategy was used to identify p53-responsive genes following adenoviral p53 gene transfer (Ad-p53) in PC3 prostate cancer cells. A total of 111 genes, 0.77% of the 14,500 genes represented on the Affymetrix U133A microarray, were repressed more than two fold (p < 0.05). Validation of the array data, using RT-PCR of 20 randomly selected genes, yielded a confirmation rate of >95.5% for the complete data set. Functional over-representation analysis revealed that cell cycle regulatory genes exhibited a highly significant enrichment (p < 5E-28) within the transrepressed targets. 41% of the repressed targets are cell cycle regulators. A subset of these genes exhibited repression following DNA damage, preceding cell cycle arrest, in LNCaP cells. The use of a p53 siRNA strategy in LNCaP cells, and the use of p53-null cell lines, demonstrated that this repression is p53-dependent. These findings identify a set of genes not known previously to be downregulated by p53 and indicate that p53-induced cell cycle arrest is a function of not only the transactivation of cell cycle inhibitors (e.g., p21), but also the repression of targets that regulate proliferation at several distinct phases of the cell cycle.
J. Biol. Chem, 10.1074/jbc.M513901200
Submitted on December 30, 2005
Revised on June 19, 2006
Accepted on June 23, 2006
Identification of cell cycle regulatory genes as principal targets of p53-mediated transcriptional repression
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