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Detection of HBsAg mutants.

Carla Osiowy1

  • 1Bloodborne Pathogens and Hepatitis, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada. carla_osiowy@phac-aspc.gc.ca

Journal of Medical Virology
|April 20, 2006
PubMed
Summary

Hepatitis B virus (HBV) screening relies on detecting HBsAg, but mutations can cause immune escape and reduce detection. New antibodies and sensitive molecular methods are needed to identify HBsAg mutants for accurate blood screening.

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Area of Science:

  • Hepatology
  • Virology
  • Immunology
  • Molecular Diagnostics

Background:

  • Routine screening for hepatitis B virus (HBV) infection relies on detecting hepatitis B surface antigen (HBsAg).
  • Immunoassays used for HBsAg detection target specific epitopes, primarily on the 'a' determinant.
  • Mutations in HBsAg, particularly within the 'a' determinant, can lead to immune escape and reduced detection by current assays.

Purpose of the Study:

  • To highlight the challenges in detecting HBsAg mutants due to mutations affecting epitope recognition and HBsAg expression.
  • To explore the need for antibodies targeting subdominant or external regions of HBsAg for improved mutant detection.
  • To discuss the role of molecular methods in identifying HBsAg mutants and the importance of considering HBV genotypic diversity.

Main Methods:

  • Review of immunoassays and their limitations in detecting HBsAg mutants.
  • Discussion of mutations within and outside the 'a' determinant affecting antibody binding.
  • Overview of molecular detection methods including sequencing, LDC-PCR, gLCR, and real-time PCR for HBsAg mutant identification.

Main Results:

  • Mutations within the second loop of the 'a' determinant are frequently associated with immune escape.
  • Nucleic acid-based methods offer higher sensitivity for detecting point mutations and minority quasispecies compared to sequencing.
  • Immunoassay formulation changes must account for HBV genotypic polymorphisms to maintain specificity and sensitivity.

Conclusions:

  • Developing novel antibodies targeting subdominant regions or external epitopes is crucial for detecting HBsAg mutants.
  • Advanced molecular techniques are essential for sensitive and specific identification of HBsAg mutants.
  • Further research into the structure of antibody-bound HBsAg is needed to guide the development of improved diagnostic tools for accurate blood screening.

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