Development and evaluation of a semi-nested PCR technique for amplification and determination of different surface gene variation patterns in patients with chronic HBV infection: development of an amplification method for HBV S gene.

Aim: Development of an amplification method for further investigation of HBV S gene variation patterns. Background: Pre-S/S variants in patients with chronic HBV infection may contribute to the progression of liver damage and Hepatocellular carcinoma (HCC). Methods: This study was performed on ten patients with chronic HBV infection. Viral DNA was extracted from patient's plasma, primer design was performed, and a semi-nested PCR method was set up to amplify the pre-S/S region of HBV genome. Subsequently, sequencing was performed to analyze the variants of this region. Results: In the current study, the semi-nested PCR method was successfully set up, and types of variation in the studied samples were investigated. Conclusion: Pre-S/S variants should be routinely determined in HBV carriers to help identify individuals who may be at a high risk of less favorable liver disease progression. This study showed that the technique could accurately amplify the pre-S/S region, and the product can be successfully used for variation detection by direct sequencing. [ABSTRACT FROM AUTHOR]