title: Quantification of the newly detected lamivudine resistant YSDD variants of Hepatitis B virus using molecular beacons.
abstract: A real-time based amplification assay with molecular beacons was used to detect and quantify PCR amplicons to discriminate between the newly described Lamivudine-resistant YSDD variant, a known YIDD variant and wild-type Hepatitis B virus (HBV) DNA in the YMDD region of the polymerase gene. Using this assay, we retrospectively analysed samples from two HBV chronically infected Asian twin sisters, starting 9 weeks before therapy, during and between two periods of treatment with Lamivudine. In order to analyse more accurately the dynamics of variant DNA loads during and after therapy, this real time assay was compared to three other mutation analysis techniques, restriction fragment length polymorphism (RFLP), InnoLipa HBV-DR assay and direct sequence analysis. With this technique, new information on the dynamics of variants during and after therapy was obtained.
authors.affiliation: Department of Virology, ErasmusMC, University Medical Center Rotterdam, Rotterdam, The Netherlands.
authors.forename: Suzan D
authors.initials: SD
authors.lastname: Pas
authors.forename: Suwanna
authors.initials: S
authors.lastname: Noppornpanth
authors.forename: Annemiek A
authors.initials: AA
authors.lastname: van der Eijk
authors.forename: Robert A
authors.initials: RA
authors.lastname: de Man
authors.forename: Hubert G M
authors.initials: HG
authors.lastname: Niesters
mesh_terms: D020816:Amino Acid Motifs; D044466:Asian People; D004200:Diseases in Twins; D024882:Drug Resistance, Viral / Q000235:genetics*; D005260:Female; D014644:Genetic Variation; D006515:Hepatitis B virus / Q000187:drug effects* / Q000235:genetics; D019694:Hepatitis B, Chronic / Q000188:drug therapy / Q000821:virology*; D006801:Humans; D019259:Lamivudine / Q000494:pharmacology* / Q000627:therapeutic use; D015335:Molecular Probes; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D018894:Reverse Transcriptase Inhibitors / Q000494:pharmacology* / Q000627:therapeutic use; D017422:Sequence Analysis, DNA; D014427:Twins
chemical_list: D015335:Molecular Probes; D018894:Reverse Transcriptase Inhibitors; D019259:Lamivudine