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Hepatitis B virus-related insertional mutagenesis implicates SERCA1 gene in the control of apoptosis

M Chami1, D Gozuacik, K Saigo

  • 1U-370 INSERM, Necker Institute, 75015 Paris, France.

Oncogene
|June 29, 2000
PubMed

Insights

Hepatitis B Virus DNA integration into the Sarco/Endoplasmic Reticulum Calcium ATPase (SERCA) gene in liver cancer leads to mutated SERCA proteins. These mutated proteins disrupt calcium homeostasis, driving tumor cell proliferation and death.

Area of Science:

  • Hepatology
  • Molecular Biology
  • Oncology

Background:

  • Hepatitis B Virus (HBV) infection is a major cause of hepatocellular carcinoma.
  • Gene mutations are critical in the development of human liver cancers.
  • Sarco/Endoplasmic Reticulum Calcium ATPase (SERCA) regulates intracellular calcium levels, vital for cell function.

Purpose of the Study:

  • To identify genes clonally mutated in vivo in human liver cancers using HBV DNA as a probe.
  • To investigate the functional consequences of HBV DNA integration into the SERCA gene.

Main Methods:

  • Utilized HBV DNA as a probe for identifying mutated genes in human liver tumors.
  • Analyzed HBV DNA integration sites and characterized chimeric HBV X/SERCA1 transcripts.
  • Performed in vitro experiments to assess the localization, dimerization, and cellular effects of chimeric SERCA1 proteins.

Main Results:

  • HBV DNA was found integrated into the SERCA gene in a human liver tumor.
  • Chimeric HBV X/SERCA1 transcripts produced truncated SERCA1 proteins that accumulated and formed dimers in tumor cells.
  • These mutated SERCA proteins localized to the ER, depleted its calcium, and induced cell death, with effects linked to SERCA expression.

Conclusions:

  • This study reports the first in vivo expression of mutated SERCA proteins in tumor cell proliferation.
  • Mutated SERCA proteins resulting from HBV integration play a role in controlling cell viability and contribute to liver cancer development.
  • The findings highlight a novel mechanism involving SERCA dysfunction in HBV-associated hepatocarcinogenesis.

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