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Development of a two-site immuno-PCR assay for hepatitis B surface antigen
1Molecular Hepatology Laboratory, Massachusetts General Hospital Cancer Center, Harvard Medical School, Charlestown 02129, USA.
Journal of Virological Methods
|April 1, 1995
Summary
A new assay detects Hepatitis B surface antigen (HBsAg) at extremely low levels, even when undetectable by standard tests. This enhanced sensitivity is crucial for understanding Hepatitis B virus (HBV) infection dynamics.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Hepatitis B virus (HBV) gene transcription can occur at undetectable levels, leading to low HBsAg concentrations.
- Current immunoassays may fail to detect very low levels of HBsAg in serum and liver.
Purpose of the Study:
- To develop a highly sensitive and specific assay for detecting low-level HBsAg.
- To improve the detection limits for Hepatitis B virus (HBV) antigens.
Main Methods:
- Developed a novel assay combining two high-affinity anti-HBs monoclonal antibodies (MAb) with polymerase chain reaction (PCR).
- Utilized a two-site MAb capture system for HBsAg, followed by biotinylation and streptavidin binding.
- Employed a biotinylated bluetongue virus (BTV) DNA molecule and BTV-specific primers for PCR detection.
- Quantified PCR products using a liquid-phase oligonucleotide enzymatic assay for enhanced sensitivity.
Main Results:
- The assay demonstrated significantly enhanced specificity and sensitivity for HBsAg detection.
- Successfully detected HBsAg at concentrations as low as 0.5 pg in serum samples.
- The combined MAb capture and PCR method proved highly effective.
Conclusions:
- The developed assay offers a substantial improvement in detecting low-level HBsAg.
- This technique holds potential for measuring other low-level viral antigens in biological samples.
- The findings contribute to a better understanding of HBV infection dynamics.