How p53 Affects Gene Expression and Epigenetics
Author Information
Author(s): Vrba Lukas, Junk Damian J, Novak Petr, Futscher Bernard W
Primary Institution: Arizona Cancer Center, the University of Arizona
Hypothesis
Wild-type p53 induces distinct epigenetic states at its direct target promoters.
Conclusion
Wild-type p53 induces transcription of target genes by binding to DNA and increasing histone acetylation at target promoters.
Supporting Evidence
- Wild-type p53 bound 197 promoters on the microarray.
- 20% of p53 targets showed increased histone acetylation linked to increased gene expression.
- DNA binding in samples expressing mutant p53 was reduced over 95% relative to wild-type p53.
Takeaway
This study shows that a healthy version of the p53 protein helps turn on genes by changing how tightly DNA is wrapped around proteins, while mutant versions of p53 can block this process.
Methodology
Chromatin immunoprecipitation coupled to a 13,000 human promoter microarray was used to study DNA binding and epigenetic changes.
Limitations
The study primarily focuses on non-malignant cells, which may not fully represent cancerous conditions.
Participant Demographics
Non-malignant hTERT-immortalized human mammary epithelial cells.
Statistical Information
P-Value
5.24E-18
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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