1887

Abstract

A phylogenetic analysis is presented of six complete and seven pre-S1/S2/S gene sequences of hepatitis B virus (HBV) isolates from South Africa. Five of the full-length sequences and all of the pre-S2/S sequences have been previously reported. Four of the six complete genomes and three of the five incomplete sequences clustered with subgroup A′, a unique segment of genotype A of HBV previously identified in 60% of South African isolates using analysis of the pre-S2/S region alone. This separation was also evident when the polymerase open reading frame was analysed, but not on analysis of either the X or pre-core/core genes. Amino acids were identified in the pre-S1 and polymerase regions specific to subgroup A′. In common with genotype D, 10 of 11 genotype A South African isolates had an 11 amino acid deletion in the amino end of the pre-S1 region. This deletion is also found in hepadnaviruses from non-human primates.

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2002-04-01
2020-09-29
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