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Detecting Somatic Genetic Alterations in Tumor Specimens by Exon Capture and Massively Parallel Sequencing
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Somatic mutations in human cancer: applications in molecular epidemiology

E Le Roux1, E Gormally, P Hainaut

  • 1Molecular Carcinogenesis Group, International Agency for Research on Cancer, 150, cours Albert-Thomas, 69372 Lyon Cedex 08.

Revue D'Epidemiologie Et De Sante Publique
|October 18, 2005
PubMed

Insights

The tumor suppressor protein p53, encoded by the TP53 gene, is crucial for cellular stress responses. TP53 mutations are common in cancer and can serve as biomarkers for mutagen exposure and cancer progression.

Area of Science:

  • Molecular Biology
  • Genetics
  • Oncology

Background:

  • The tumor suppressor protein p53 is a critical regulator of cellular responses to stress, including cell-cycle arrest, DNA repair, and apoptosis.
  • The TP53 gene is the most frequently mutated gene in human cancers, with over 20,000 described mutations, predominantly missense mutations in its central domain.
  • TP53 mutation patterns can reflect exposure to environmental mutagens, exemplified by the codon 249 mutation in hepatocellular carcinoma linked to aflatoxin B1 and HBV infection.

Purpose of the Study:

  • To highlight the multifaceted roles of the TP53 gene and its mutations in cancer.
  • To explore the potential of TP53 mutations as biomarkers for mutagenic exposures.
  • To discuss the application of TP53 mutations in plasma for early cancer detection and progression monitoring.

Main Methods:

  • Review of existing literature on TP53 gene mutations and their functional consequences.
  • Analysis of mutation patterns in various cancers and their correlation with environmental factors.
  • Investigation of emerging methods for detecting TP53 mutations in circulating cell-free DNA.

Main Results:

  • TP53 mutations are highly prevalent in cancer and exhibit specific patterns related to mutagen exposure.
  • The TP53 gene's mutation distribution can act as a 'mutagen fingerprint', e.g., codon 249 mutation in hepatocellular carcinoma.
  • TP53 mutations are detectable in circulating cell-free DNA (cfDNA) in plasma, even in pre-cancerous stages.

Conclusions:

  • TP53 mutations serve as valuable indicators of mutagenic exposures and cancer development.
  • Plasma-based detection of TP53 mutations holds significant promise for early cancer diagnosis and monitoring.
  • Understanding TP53 mutation profiles aids in assessing cancer occurrence, progression, and the impact of environmental carcinogens.

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