Disparate chromatin landscapes and kinetics of inactivation impact differential regulation of p53 target genes.

ABSTRACT: The p53 transcription factor regulates the expression of genes involved in cellular responses to stress, including cell cycle arrest and apoptosis. The p53 transcriptional program is extremely malleable, with target gene expression varying in a stress- and cell type-specific fashion. The molecular mechanisms underlying differential p53 target gene expression remain elusive. Here we provide evidence for gene-specific mechanisms affecting expression of three important p53 target genes. First we show that transcription of the apoptotic gene PUMA is regulated through intragenic chromatin boundaries, as revealed by distinct histone modification territories that correlate with binding of the insulator factors CTCF, Cohesins and USF1/2. Interestingly, this mode of regulation produces an evolution

SUBMITTER: Gomes NP 

PROVIDER: S-EPMC3047614 | biostudies-literature | 2010 Sep

REPOSITORIES: biostudies-literature