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p53 mutations in malignant gliomas

Y Li1, R C Millikan, S Carozza

  • 1Department of Epidemiology, School of Public Health, University of North Carolina, Chapel Hill 27599-7400, USA.

Cancer Epidemiology, Biomarkers & Prevention : a Publication of the American Association for Cancer Research, Cosponsored by the American Society of Preventive Oncology
|May 6, 1998
PubMed
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Malignant glioma tumors show p53 gene mutations, with a high rate of transversion mutations, particularly in exon 4. This suggests environmental factors may contribute to glioma development.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Malignant glioma is a significant cause of cancer-related mortality.
  • The tumor suppressor gene p53 plays a critical role in preventing cancer development.
  • Understanding p53 mutations in glioma is crucial for diagnosis and treatment.

Purpose of the Study:

  • To analyze mutations in the p53 gene in a population-based series of malignant glioma cases.
  • To investigate the prevalence and types of p53 mutations, focusing on specific exons.
  • To present an improved screening method for p53 exon 4 mutations.

Main Methods:

  • Analysis of 62 incident malignant glioma cases.
  • Screening of p53 exons 4-8 using PCR-single-strand conformation analysis (PCR-SSCA).

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  • Confirmation of mutations via direct sequencing.

    • Main Results:

    • 19% (12 out of 62) of tumors harbored p53 mutations.
    • A higher prevalence of transversion mutations (56%) compared to transition mutations (33%) was observed.
    • A significant proportion of transversion mutations were identified in exon 4, a region not routinely screened.

    Conclusions:

    • The study identified specific p53 mutations in malignant glioma, with a notable frequency of transversion mutations.
    • The findings highlight the importance of screening p53 exon 4 for comprehensive mutation analysis in gliomas.
    • The high rate of transversion mutations suggests a potential role for exogenous carcinogens in malignant glioma etiology.