Real-Time Polymerase Chain Reaction-Based Detection and Quantification of Hepatitis B Virus DNA
December 15th, 2023
Real-time polymerase chain reaction (PCR)-based detection and quantification of hepatitis B virus (HBV) DNA is a sensitive and accurate method for diagnosing and monitoring HBV infection. Here, we present a protocol for HBV DNA detection and the viral load measurement of a sample.
In this video, we will show you a step-by-step protocol to detect HBV DNA and quantify its viral load using our IVD approved real-time PCR based true PCR HBV viral load kit. HBV diagnosis research uses realtime PCR, digital PCR NGS and serological tests. Realtime PCR is the gold standard for HBV DNA detection and viral load quantification.
Digital PCR quantifies absolute viral load. NGS identifies new mutations and serological tests, detect antigens or antibodies. There are several experimental challenges with detecting low viral load cases and occult HBV infections.
Some assays may not perform well across all HBV genotypes and emerging new mutations may lead to false negative results. Compared to other techniques, the realtime PCR based protocol is the most sensitive, specific and quantitative method available for HBV detection. It is also a relatively fast technique, which makes it ideal for clinical use To begin thaw all reagents provided in the real-time PCR kit at room temperature.
Once thawed, pulse vortex the components for 10 seconds at a moderate speed to mix them. Then centrifuge at 8000G for 10 seconds at room temperature. Keep the thawed components on a cooling block.
Next, prepare a PCR mix for an HBV positive sample. Five HBV standards and no template control. Thoroughly mix the added reagents by gently pipetting 7 to 10 times, followed by pulse, vortexing and centrifuge at 8000G for 10 seconds at room temperature.
Then pipet 15 microliters of the PCR mix into each PCR tube. Add 15 microliters of extracted DNA sample five HBV standards and nuclease free water as a no template control. Close the PCR tubes and briefly spin in the centrifuge.
Load the PCR tubes in a realtime PCR machine. Now initiate the thermal cycler software, choose fluorescent dyes and program the thermal cycler for real-time PCR. Post run analyze the amplification plot using a linear scale.
Set the PCR reaction threshold within the exponential phase. Maintain consistency in threshold settings for accuracy and reproducibility. Use the same threshold for all samples on a specific PCR machine.
Consider samples with amplification before CD value 38 as HBV positive based on the assay's cutoff. Use five quantification standards for HBV specific DNA, calibrated against the fourth WHO international standard for HBV DNA. Generate a standard curve with these standards to quantify HBV DNA in unknown samples.
Interpret values for unknown samples only if the standard curve slope is between minus 3.1 and minus 3.6. The R square value is between 0.99 and 1.0. PCR efficiency is within 90%to 110%and there is no amplification in the negative control.
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Overview
This study presents a real-time PCR-based protocol for the detection and quantification of hepatitis B virus (HBV) DNA, which is essential for accurate diagnosis and monitoring of HBV infections. The method is recognized as the gold standard due to its sensitivity and specificity in identifying HBV viral loads.
Key Study Components
Research Area
- Hepatitis B virus (HBV) detection
- Viral load quantification
- Clinical diagnostics
Background
- Importance of accurate HBV detection in clinical settings
- Challenges in identifying low viral loads and occult infections
- Comparison of PCR with other diagnostic techniques
Methods Used
- Real-time polymerase chain reaction (PCR)
- Samples include HBV positive controls
- Use of WHO international standard for calibration
Main Results
- Successful quantification of HBV DNA using a standard curve
- Identification of samples with significant amplification
- Parameter calibration ensuring high accuracy and reproducibility
Conclusions
- This study provides a reliable protocol for HBV DNA detection and viral load measurement.
- The method’s high sensitivity makes it a valuable tool in hepatitis research and clinical diagnostics.
Frequently Asked Questions
Executive Industry Relevance
Real-time PCR-based detection and quantification of HBV DNA addresses a critical need for sensitive, reproducible viral load measurement in infectious disease research and clinical diagnostics. This capability enables precise monitoring of HBV infection status, supporting data-driven decisions at key inflection points in antiviral development and translational research. The method's standardization and quantitative rigor underpin predictive confidence and portfolio prioritization in biopharma pipelines.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables robust interrogation of HBV replication and persistence mechanisms in disease-relevant systems.
- Supports functional validation of antiviral targets by quantifying viral DNA reduction.
- Facilitates mechanistic de-risking by distinguishing true biological effects from assay artifacts.
Screening & Assay Development
- Provides a validated, quantitative readout for evaluating compound efficacy against HBV.
- Ensures assay reproducibility and standardization across multiple HBV genotypes and sample types.
- Delivers high sensitivity for detecting low viral loads, supporting early-stage screening and lead identification.
Translational & Preclinical Research
- Aligns with clinical biomarker standards by calibrating quantification to WHO international references.
- Enables continuity from in vitro discovery to preclinical validation through standardized viral load measurement.
- Supports risk-adjusted advancement by providing quantitative endpoints for efficacy assessment.
Pipeline & Workflow Integration
This real-time PCR protocol integrates from early discovery through preclinical research, enabling consistent viral load quantification and supporting translational continuity.
- Discovery Biology: Facilitates hypothesis testing and pathway clarification by quantifying HBV DNA in experimental models.
- Screening: Provides reproducible, quantitative outputs for compound evaluation and assay standardization.
- Analytics: Delivers precise Ct values, standard curve calibration, and efficiency metrics for robust data comparison.
- Translational Research: Ensures alignment with clinical standards and supports biomarker-driven decision making.
- Enterprise Reuse: Offers a scalable, standardized workflow adaptable across HBV research and antiviral development programs.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence and reduces mechanistic ambiguity in HBV target validation.
- Operational Value: Delivers high reproducibility, sensitivity, and cross-genotype applicability for scalable workflows.
- Strategic Value: Enables informed go/no-go decisions and capital-efficient portfolio management.
- Portfolio Impact: Supports risk-adjusted prioritization and advancement of antiviral candidates.
Implementation Considerations
- Requires expertise in molecular virology and quantitative PCR analysis.
- Needs access to real-time PCR instrumentation and validated calibration standards.
- Demands rigorous cross-team standardization of threshold and efficiency parameters.
- Must be adaptable to diverse HBV genotypes and sample matrices.
- Dependent on strict quality controls to avoid false negatives and ensure assay integrity.
