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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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TP53 and hepatocellular carcinoma

A Puisieux1, M Ozturk

  • 1Unité INSERM U453, Centre Léon, Bérard, Lyon, France.

Pathologie-Biologie
|October 14, 1998
PubMed
Summary

TP53 gene mutations are common in hepatocellular carcinoma (HCC), varying by geography. Specific mutations, like p53-249ser, may gain function, while others inactivate p53, impacting cell cycle arrest and apoptosis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Hepatology

Background:

  • TP53 gene mutations are prevalent in hepatocellular carcinoma (HCC), affecting 30-55% of cases.
  • Mutation frequency and type in HCC are geographically dependent, with a specific codon 249 mutation linked to aflatoxin exposure.
  • TP53 mutations lead to loss of wild-type p53 function, and some mutants, like p53-249ser, may exhibit gain-of-function properties.

Purpose of the Study:

  • To investigate the role and characteristics of TP53 mutations in hepatocellular carcinoma.
  • To explore the geographical variations in TP53 mutation patterns within HCC tumors.
  • To understand the functional consequences of TP53 mutations, including potential gain-of-function and inactivation by Hepatitis B Virus HBx protein.

Main Methods:

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  • Analysis of TP53 gene mutations in HCC patient samples.
  • Correlation of mutation types and frequencies with geographical location and environmental factors (e.g., aflatoxin exposure).
  • Assessment of p53 protein function, including wild-type inactivation and mutant gain-of-function, and evaluation of p53-dependent responses to DNA damaging agents in cell lines and animal models.

    • Main Results:

    • TP53 mutations are frequent in HCC, with distinct geographical patterns.
    • A specific TP53 mutation at codon 249 is highly prevalent in regions with high aflatoxin exposure.
    • TP53 mutations result in loss of wild-type p53 function, with some mutants showing gain-of-function.
    • Wild-type p53 function can also be inactivated by the Hepatitis B Virus HBx protein.
    • DNA damaging agents induce p53-dependent cell cycle arrest or apoptosis in liver-derived cell lines, but not in adult mouse liver, potentially due to quiescent hepatocytes.

    Conclusions:

    • TP53 mutations are a significant factor in HCC development and progression, with geographically influenced etiological factors.
    • The functional impact of TP53 mutations in HCC includes both loss and potential gain of function.
    • Understanding p53 pathway alterations is crucial for HCC pathogenesis and therapeutic strategies.