Andrzej Taranta1, Bui Tien Sy2, Behrend Johan Zacher1, Magdalena Rogalska-Taranta3, Michael Peter Manns1, Claus Thomas Bock4, Karsten Wursthorn5. 1. Hannover Medical School (MHH), Department of Gastroenterology, Hepatology and Endocrinology, Carl-Neuberg-Straße 1, 30623 Hannover, Germany. 2. Robert Koch Institute, Department of Infectious Diseases, Seestraße 10, 13353 Berlin, Germany; Institute of Tropical Medicine, University of Tuebingen, Wilhelmstraße 27D, 72074 Tübingen, Germany. 3. Hannover Medical School (MHH), Department of Gastroenterology, Hepatology and Endocrinology, Carl-Neuberg-Straße 1, 30623 Hannover, Germany; Department of Infectious Diseases and Hepatology, Medical University of Bialystok, Żurawia 14, 15540 Białystok, Poland. 4. Robert Koch Institute, Department of Infectious Diseases, Seestraße 10, 13353 Berlin, Germany. 5. Hannover Medical School (MHH), Department of Gastroenterology, Hepatology and Endocrinology, Carl-Neuberg-Straße 1, 30623 Hannover, Germany; ifi - Institut für Interdisziplinäre Medizin, Lohmühlenstraße. 5, 20099 Hamburg, Germany. Electronic address: wursthorn@gmail.com.
Abstract
BACKGROUND: Hepatitis B virus (HBV) replicates via reverse transcription converting its partially double stranded genome into the covalently closed circular DNA (cccDNA). The long-lasting cccDNA serves as a replication intermediate in the nuclei of hepatocytes. It is an excellent, though evasive, parameter for monitoring the course of liver disease and treatment efficiency. OBJECTIVE: To develop and test a new approach for HBV DNA quantification in serum and small-size liver samples. STUDY DESIGN: The p3io plasmid contains an HBV fragment and human β-actin gene (hACTB) as a standard. Respective TaqMan probes were labeled with different fluorescent dyes. A triplex real-time PCR for simultaneous quantification of total HBV DNA, cccDNA and hACTB could be established. RESULTS: Three-in-one method allows simultaneous analysis of 3 targets with a lower limit of quantification of 48 copies per 20 μl PCR reaction and a wide range of linearity (R(2)>0.99, p<0.0001) for all measured sequences. The method showed a pan-genotypic specificity among genotypes A-F with serum DNA samples from HBV infected patients. Total HBV DNA and cccDNA could be quantified in 32 and 22 of 33 FFPE preserved liver specimens, respectively. Total HBV DNA concentrations quantified by the 3io method remained comparable with Cobas TaqMan HBV Test v2.0. CONCLUSIONS: The three-in-one protocol allows the single step quantification of viral DNA in samples from different sources. Therefore lower sample input, faster data acquisition, a lowered error and significantly lower costs are the advantages of the method.
BACKGROUND:Hepatitis B virus (HBV) replicates via reverse transcription converting its partially double stranded genome into the covalently closed circular DNA (cccDNA). The long-lasting cccDNA serves as a replication intermediate in the nuclei of hepatocytes. It is an excellent, though evasive, parameter for monitoring the course of liver disease and treatment efficiency. OBJECTIVE: To develop and test a new approach for HBV DNA quantification in serum and small-size liver samples. STUDY DESIGN: The p3io plasmid contains an HBV fragment and human β-actin gene (hACTB) as a standard. Respective TaqMan probes were labeled with different fluorescent dyes. A triplex real-time PCR for simultaneous quantification of total HBV DNA, cccDNA and hACTB could be established. RESULTS: Three-in-one method allows simultaneous analysis of 3 targets with a lower limit of quantification of 48 copies per 20 μl PCR reaction and a wide range of linearity (R(2)>0.99, p<0.0001) for all measured sequences. The method showed a pan-genotypic specificity among genotypes A-F with serum DNA samples from HBV infectedpatients. Total HBV DNA and cccDNA could be quantified in 32 and 22 of 33 FFPE preserved liver specimens, respectively. Total HBV DNA concentrations quantified by the 3io method remained comparable with Cobas TaqMan HBV Test v2.0. CONCLUSIONS: The three-in-one protocol allows the single step quantification of viral DNA in samples from different sources. Therefore lower sample input, faster data acquisition, a lowered error and significantly lower costs are the advantages of the method.