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Yeast As a Chassis for Developing Functional Assays to Study Human P53
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Distinct p53 genomic binding patterns in normal and cancer-derived human cells.

Krassimira Botcheva1, Sean R McCorkle, W R McCombie

  • 1Biology Department, Brookhaven National Laboratory, Upton, NY, USA. kalexiev@bnl.gov

Cell Cycle (Georgetown, Tex.)
|December 1, 2011
PubMed
Summary

This study maps tumor suppressor p53 binding sites in normal human cells, revealing distinct genomic locations and CpG island enrichment compared to cancer cells. These findings highlight the influence of chromatin landscape on p53 binding.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Epigenetics

Background:

  • The tumor suppressor p53 is a critical transcription factor involved in cell cycle regulation and DNA repair.
  • Previous genome-wide studies have primarily focused on p53 binding sites in cancer cells, leaving their landscape in normal cells largely uncharacterized.

Purpose of the Study:

  • To perform the first genome-wide, de novo mapping of p53 binding sites in normal human cells.
  • To characterize the genomic features and epigenetic context of p53 binding sites in normal fibroblasts.
  • To compare these findings with p53 binding sites in cancer-derived cells.

Main Methods:

  • Chromatin immunoprecipitation sequencing (ChIP-seq) was employed to identify p53 binding sites in normal IMR90 fibroblasts.
  • Bioinformatic analysis was used to determine the location and characteristics of ChIP-seq peaks.
  • Comparison with existing methylome data for IMR90 cells was performed.

Main Results:

  • 743 high-confidence p53 binding sites were identified in normal IMR90 cells.
  • Over 40% of these sites were located within 2 kb of a transcription start site (TSS).
  • Nearly half of the binding sites were found in CpG islands, contrasting with findings in cancer cells.
  • p53 binding sites in normal cells were enriched at hypomethylated DNA regions.
  • The de novo p53 motif was similar to those found in cancer cells, suggesting sequence is not the primary differentiator.

Conclusions:

  • p53 binding sites exhibit distinct genomic landscapes in normal versus cancer-derived human cells.
  • The chromatin landscape, particularly DNA methylation, likely influences p53 binding availability in normal cells.
  • This study provides a foundational understanding of p53's genomic interactions in a healthy cellular context.