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Hepatitis01:25

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Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver.
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Viral hepatitis is an inflammatory condition of the liver caused by infection with hepatotropic viruses, most commonly hepatitis A, B, C, D, and E. Despite variations in structure and transmission, all viruses mentioned infect hepatocytes and provoke immune responses that can hinder liver function. Additionally, some non-hepatotropic viruses can also lead to hepatic inflammation.Hepatitis A VirusHepatitis A virus (HAV) is transmitted through the fecal–oral route, typically by ingestion...
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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Potential mutations associated with occult hepatitis B virus status.

Sima Besharat1, Aezam Katoonizadeh2, Abdolvahab Moradi3

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Occult hepatitis B virus (HBV) infection involves HBV DNA in the liver without detectable surface antigen. Mutations in the HBV genome are key to understanding this condition and developing better diagnostic and treatment strategies.

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Area of Science:

  • Hepatology
  • Virology
  • Genetics

Background:

  • Occult hepatitis B virus (HBV) status (OHBS) is defined by HBV DNA in the liver without detectable serum HBsAg.
  • OHBS is clinically significant for potential transmission via blood transfusion and liver transplantation, and for causing HBV-related liver disease.
  • The underlying mechanisms of OHBS are poorly understood, with proposed causes including host immune response defects and viral genetic mutations.

Purpose of the Study:

  • To review current data on HBV genome mutations associated with OHBS.
  • To explore the role of these mutations in the pathogenesis of occult hepatitis B.
  • To highlight the diagnostic challenges posed by certain HBV mutations in OHBS.

Main Methods:

  • A comprehensive literature review of studies on HBV genome mutations in OHBS patients.
  • Data collection involved searching PubMed using keywords related to occult hepatitis B, HBV genome, and specific gene mutations (S, X, P, C).

Main Results:

  • Identified mutations include variants in the HBsAg major hydrophilic region, pre-S1 deletions, S ORF stop codons, and non-common mutations.
  • Mutations affecting HBV protein production, start codons, and nucleotide changes in X, P, and C ORFs are implicated in OHBS.
  • S-escape mutants, undetectable by routine assays, pose diagnostic difficulties.

Conclusions:

  • OHBS likely results from multiple interacting mechanisms, as studies often lack control groups and comprehensive HBV sequencing.
  • Further research involving full-length HBV genome sequencing in both occult and non-occult cases is needed to elucidate the complex pathogenesis of OHBS.