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- W2095306508 abstract "Many variants of hepatitis B virus (HBV) with deletions in the viral genome have been identified. Some of these variants are indicator or even effector of a more severe course of hepatitis. These deletion mutants contribute a variable and sometimes very low proportion to the viral population. For early detection of small amounts of deletion mutants among a large number of wild-type genomes, we applied a new screening method designated quantitative fragment analysis (QFA). By QFA the whole viral genome can be scanned for the presence of deletions or insertions of >/=3 nucleotides representing more than 2% of the viral population. Using QFA we showed that an often described deletion of 8 nucleotides is packaged in viral capsids and not a polymerase chain reaction (PCR) artifact. QFA was applied to study the emergence of deletion mutants in a group of 18 pediatric patients who had been infected from a common source while being under multidrug cancer chemotherapy. All patients had developed a highly viremic asymptomatic HBV carrier state. In 3 of these patients 3 different kinds of HBV deletion mutants were found by QFA: 8 bp deletions within the core promoter, core gene deletions from 8 to 86 bp, and large deletions of up to 1,989 bp spanning the precore/core and the preS/S reading frames. PCR primers that specifically amplify deletion variants enabled the detection of additional patients harboring the investigated variant." @default.
- W2095306508 created "2016-06-24" @default.
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- W2095306508 date "2000-11-01" @default.
- W2095306508 modified "2023-10-04" @default.
- W2095306508 title "Quantitative DNA Fragment Analysis for Detecting Low Amounts of Hepatitis B Virus Deletion Mutants in Highly Viremic Carriers" @default.
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- W2095306508 doi "https://doi.org/10.1053/jhep.2000.19323" @default.
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