CYFIP2, a direct p53 target, is leptomycin-B sensitive

RS Jackson II, YJ Cho, S Stein, P Liang - Cell Cycle, 2007 - Taylor & Francis
RS Jackson II, YJ Cho, S Stein, P Liang
Cell Cycle, 2007Taylor & Francis
A number of target genes for the tumor suppressor, p53, have been identified, however, the
mechanisms that contribute to p53-dependent apoptosis remain to be fully elucidated. In a
comprehensive screen for p53 target genes, we have identified Cytoplasmic FMR Interacting
Protein 2 (CYFIP2) as a p53-inducible gene. Here we show that the CYFIP2 promoter
contains a p53-responsive element that confers p53 binding as well as transcriptional
activation of a heterologous reporter. Inducible expression of CYFIP2 is sufficient for …
A number of target genes for the tumor suppressor, p53, have been identified, however, the mechanisms that contribute to p53-dependent apoptosis remain to be fully elucidated. In a comprehensive screen for p53 target genes, we have identified Cytoplasmic FMR Interacting Protein 2 (CYFIP2) as a p53-inducible gene. Here we show that the CYFIP2 promoter contains a p53-responsive element that confers p53 binding as well as transcriptional activation of a heterologous reporter. Inducible expression of CYFIP2 is sufficient for caspase activation and cellular apoptosis, reminiscent of p53 activation. Together, these results suggest that CYFIP2 is a direct p53 target gene that may be part of a redundant network of genes responsible for p53-dependent apoptosis. In addition, the sensitivity of CYFIP2 protein subcellular localization to Leptomycin-B, a Crm-1/Exportin inhibitor, suggests that the biological functions of CYFIP2 may extend from the cytoplasmic compartment into the nucleus of the cell.
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