title: Real-time PCR assay for detection and quantification of hepatitis B virus genotypes A to G.
abstract: The detection and quantification of hepatitis B virus (HBV) DNA play an important role in diagnosing and monitoring HBV infection as well as assessing therapeutic response. The great variability among HBV genotypes and the enormous range of clinical HBV DNA levels present challenges for PCR-based amplification techniques. In this study, we describe the development, evaluation, and validation of a novel real-time PCR assay designed to provide accurate quantification of DNA from all eight HBV genotypes in patient plasma specimens. A computer algorithm was used to design degenerate real-time PCR primers and probes based upon a large number (n = 340) of full-length genomic sequences including HBV genotypes A to H from Europe, Africa, Asia, and North and South America. Genotype performance was tested and confirmed using 59 genotype A to G specimens from two commercially available worldwide genotype panels. This assay has a dynamic range of at least 8 log(10) without the need for specimen dilution, good clinical intra- and interassay precision, and excellent correlation with the Bayer Diagnostics VERSANT HBV DNA 3.0 (branched DNA) assay (r = 0.93). Probit analysis determined the 95% detection level was 56 IU/ml, corresponding to 11 copies per PCR well. The high sensitivity, wide linear range, good reproducibility, and genotype inclusivity, combined with a small sample volume requirement and low cost, make this novel quantitative HBV real-time PCR assay particularly well suited for application to large clinical and epidemiological studies.
authors.affiliation: Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Rockville, Maryland 20892, USA.
authors.forename: Tania M
authors.initials: TM
authors.lastname: Welzel
authors.forename: Wendell J
authors.initials: WJ
authors.lastname: Miley
authors.forename: Thomas L
authors.initials: TL
authors.lastname: Parks
authors.forename: James J
authors.initials: JJ
authors.lastname: Goedert
authors.forename: Denise
authors.initials: D
authors.lastname: Whitby
authors.forename: Betty A
authors.initials: BA
authors.lastname: Ortiz-Conde
mesh_terms: D004279:DNA, Viral / Q000032:analysis / Q000302:isolation & purification; D005838:Genotype; D006509:Hepatitis B / Q000175:diagnosis / Q000821:virology; D006515:Hepatitis B virus / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification; D006801:Humans; D021141:Nucleic Acid Amplification Techniques / Q000592:standards; D016133:Polymerase Chain Reaction / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014944:World Health Organization
chemical_list: D004279:DNA, Viral