Computational analysis in vivo p53 binding sites in the context of chromatin and repeat regions

The p53 tumor suppressor protein is involved in multiple central cellular processes and human cancer occurrences. A research effort is proposed to collect the majority of p53 ChIP fragments up to now and reveal the binding pattern of p53 binding sites. It demonstrates that the normal and cancer cell lines have significantly different chromatin organizations around P53 binding sites. Based on the high occurrences, the core binding sites can be collected to analyze gene expression configurations. Depending on the accessibility of p53 sites and epigenetic marks in the chromatin context, p53 binds to its target sites in repetitive regions. Finally, the functional annotation analysis illustrates that the most enriched pathway of p53 ChIP fragments is p53 signaling pathway and highly enriched clusters relating to apoptosis, DNA damage and cellular signaling are modulated by p53.