Robust hepatitis B virus genotyping by mass spectrometry

Area of Science:

• Hepatology
• Virology
• Analytical Chemistry

Background:

• Hepatitis B virus (HBV) genotyping is crucial for infection tracking, disease prognostication, and treatment outcome prediction.
• Current HBV genotyping methods are often labor-intensive, expensive, and require subjective interpretation.
• There is a need for more efficient and objective HBV genotyping techniques.

Purpose of the Study:

• To evaluate a novel matrix-assisted laser desorption ionization-time-of-flight mass spectrometry (MALDI-TOF MS) approach for HBV genotyping.
• To compare the accuracy and reliability of MALDI-TOF MS with the gold standard sequencing method.
• To establish a rapid, cost-effective, and automated method for HBV genotyping in diagnostic settings.

Main Methods:

• Sera from 756 individuals with acute or chronic HBV infection were analyzed.
• The HBV S gene was PCR amplified from serum samples.
• Amplicons underwent base-specific cleavage and MALDI-TOF MS analysis, with results interpreted by automated comparison to reference genotypes.

Main Results:

• The MALDI-TOF MS method demonstrated complete concordance with phylogenetic analysis of HBV sequences.
• Factors like genetic relatedness and infection chronicity did not compromise the accuracy of genotype calls.
• The MS-based genotyping provided rapid and accurate results with automated data reporting.

Conclusions:

• The developed MALDI-TOF MS method offers a streamlined, rapid, and accurate approach for HBV genotyping.
• This automated MS-based technique is a reliable and cost-effective alternative to traditional methods.
• The method is well-suited for routine implementation in clinical diagnostic laboratories for HBV management.