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Detection of YMDD mutants using universal template real-time PCR
Rong-Sheng Wang1, Hua Zhang, Yu-Fen Zhu
1Jiangsu Oil Field Hospital, Shaobo, Jiangdu, China.
World Journal of Gastroenterology
|March 15, 2006
Summary
A new real-time PCR method accurately detects lamivudine-resistant mutations in hepatitis B virus (HBV). This rapid test aids in monitoring drug resistance during treatment for chronic HBV infection.
Area of Science:
- Virology
- Molecular Biology
- Hepatology
Background:
- Chronic hepatitis B virus (HBV) infection is a global health concern.
- Lamivudine is a commonly used antiviral medication for HBV.
- Development of lamivudine resistance is a significant clinical challenge.
Purpose of the Study:
- To develop a rapid and accurate real-time PCR method for detecting lamivudine-resistant mutations (YMDD variants) in HBV.
- To enable monitoring of lamivudine resistance in patients undergoing treatment.
Main Methods:
- A real-time PCR assay utilizing a universal template and TaqMan probe was developed.
- Specific reactions were designed to detect YVDD and YIDD mutants, with a control reaction for total HBV.
- The method was validated using cloned HBV polymerase gene variants and applied to serum samples from 163 patients.
Main Results:
- The assay demonstrated high sensitivity, detecting down to 1000 copies/mL of wild-type plasmid with no nonspecific priming.
- Lamivudine-resistant mutations were identified in 51 out of 163 (31.3%) patient samples.
- Results were confirmed by DNA sequencing.
Conclusions:
- The established universal real-time PCR is a rapid, accurate, and reliable method for quantifying YMDD mutants in HBV.
- This method is suitable for monitoring lamivudine resistance in patients before and during antiviral therapy.
- It facilitates timely clinical decisions for managing chronic hepatitis B.