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Hepatitis B Surface Antigen Isoforms: Their Clinical Implications, Utilisation in Diagnosis, Prevention and New Antiviral Strategies
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Hepatitis B Surface Antigen Isoforms: Their Clinical Implications, Utilisation in Diagnosis, Prevention and New Antiviral Strategies
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Journal Article
Hepatitis B Surface Antigen Isoforms: Their Clinical Implications, Utilisation in Diagnosis, Prevention and New Antiviral Strategies
2024
Overview
The hepatitis B surface antigen (HBsAg) is a multifunctional glycoprotein composed of large (LHB), middle (MHB), and small (SHB) subunits. HBsAg isoforms have numerous biological functions during HBV infection—from initial and specific viral attachment to the hepatocytes to initiating chronic infection with their immunomodulatory properties. The genetic variability of HBsAg isoforms may play a role in several HBV-related liver phases and clinical manifestations, from occult hepatitis and viral reactivation upon immunosuppression to fulminant hepatitis and hepatocellular carcinoma (HCC). Their immunogenic properties make them a major target for developing HBV vaccines, and in recent years they have been recognised as valuable targets for new therapeutic approaches. Initial research has already shown promising results in utilising HBsAg isoforms instead of quantitative HBsAg for correctly evaluating chronic infection phases and predicting functional cures. The ratio between surface components was shown to indicate specific outcomes of HBV and HDV infections. Thus, besides traditional HBsAg detection and quantitation, HBsAg isoform quantitation can become a useful non-invasive biomarker for assessing chronically infected patients. This review summarises the current knowledge of HBsAg isoforms, their potential usefulness and aspects deserving further research.
Publisher
MDPI AG
Subject
/ Antiviral Agents - therapeutic use
/ Genomes
/ Hepatitis associated antigen
/ Hepatitis B - prevention & control
/ Hepatitis B Surface Antigens - blood
/ Hepatitis B Surface Antigens - immunology
/ Hepatitis B Surface Antigens - metabolism
/ Hepatitis B Vaccines - administration & dosage
/ Hepatitis B Vaccines - immunology
/ Hepatitis B virus - genetics
/ Hepatitis B virus - immunology
/ Hepatitis B, Chronic - diagnosis
/ Hepatitis B, Chronic - drug therapy
/ Hepatitis B, Chronic - immunology
/ hepatoma
/ Humans
/ Isoforms
/ liver
/ middle surface protein (MHB)
/ mutation
/ Proteins
/ Viruses
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