Structure of the rat p53 tumor suppressor gene

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J E Hulla1, R P Schneider

  • 1Pacific Northwest Laboratory, Richland, WA 99352.

Nucleic Acids Research
|February 11, 1993
PubMed

Insights

The rat p53 tumor suppressor gene structure was determined, revealing 10 exons and significant differences from mouse and human genes. Intron 6 may be functionally insignificant in rats, impacting cancer research insights.

Area of Science:

  • Genetics
  • Molecular Biology
  • Cancer Research

Background:

  • p53 tumor suppressor gene aberrations are common in human cancers.
  • p53 protein regulates cell cycle, differentiation, signal transduction, and gene expression.
  • p53 may protect the genome from damaged DNA integration.

Purpose of the Study:

  • To determine the structure of the rat p53 gene for cancer research.
  • To compare the rat p53 gene structure with mouse and human orthologs.

Main Methods:

  • Gene structure determination in a rat model.
  • Identification of splice sites and intervening sequences.
  • Analysis of allelic polymorphism within intron 5.

Main Results:

  • The rat p53 gene has 10 exons, differing from the 11 exons in mouse and human genes.
  • Identified 18 splice sites and defined intervening sequences.
  • Discovered an allelic polymorphism in intron 5.
  • Rat p53 gene structure closely approximates the mouse ortholog.
  • No intervening sequence between rat exons corresponding to mouse/human exons 6 and 7.

Conclusions:

  • Rat p53 gene structure provides a model for studying p53's role in carcinogenesis.
  • Intron 6's lack of intervening sequence suggests potential functional insignificance in rats.
  • Mutations in intron 6 may not be pathologically significant unless they disrupt splicing.

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