Complete sequencing of a gibbon hepatitis B virus genome reveals a unique genotype distantly related to the chimpanzee hepatitis B virus

Virology
H NorderL O Magnius

Abstract

We have sequenced the complete genome of a hepatitis B virus (HBV) strain that was transmitted from a gibbon with chronic hepatitis B to a chimpanzee that subsequently developed acute hepatitis B. The genome was 3,182 nucleotides long and had a genetic organization identical to and including the characteristics of other mammalian hepadnaviruses. Thus, the regulatory elements, the direct repeats, and the four open reading frames (ORFs) of this virus were all maintained, although there were amino acid substitutions affecting all the ORFs. Within the S gene encoding for the hepatitis B surface antigen (HBsAg), the subtype could be deduced as ayw3 in accordance with previous serological results. There were 25 amino acid substitutions affecting the P gene, 12 of which were within the spacer region. This region, which was the most divergent part of the genome compared to other HBV strains, also encodes for the pre-S proteins. A comparison with sequences of other hepadnaviruses revealed that the genome of gibbon HBV was unique as compared to previously described HBV genotypes. It was most similar to the chimpanzee HBV strain with which it shared 90.3% nucleic acid homology at the level of the complete genome and 96.3% homology at the ...Continue Reading

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