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Related Experiment Videos

Analysis of p53-regulated gene expression patterns using oligonucleotide arrays.

R Zhao1, K Gish, M Murphy

  • 1Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544, USA.

Genes & Development
|April 27, 2000
PubMed
Summary

The p53 transcription factor

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The p53 transcription factor plays a critical role in cellular responses to DNA damage.
  • Understanding p53's regulatory network is crucial for deciphering cellular fate decisions.

Purpose of the Study:

  • To compare the transcriptional patterns of p53-regulated genes in response to DNA damage versus zinc-induced p53.
  • To investigate how p53 protein levels and inducing agents influence gene expression kinetics.

Main Methods:

  • Oligonucleotide microarrays were used to quantify mRNA levels for thousands of genes.
  • Cluster analysis was employed to identify distinct gene expression patterns.
  • Cell cultures were treated with gamma radiation, UV radiation, or zinc to induce p53.

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Main Results:

  • Genes regulated by gamma radiation, UV radiation, and zinc-induced p53 formed distinct sets, with some overlap.
  • p53 responses were found to be cell type-specific.
  • The kinetics of mRNA induction or repression varied, with distinct classes observed based on p53 levels and inducing agents.
  • Among 6000 genes, 107 were induced and 54 repressed, falling into categories like apoptosis, growth arrest, and cell adhesion.

Conclusions:

  • The transcriptional response mediated by p53 is complex and depends on p53 protein levels, the nature of the stimulus, and the cell type.
  • p53 regulates a diverse set of genes involved in critical cellular processes, including apoptosis, growth control, and cell adhesion.