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Characterization of hepatitis B virus genotypes among Yucpa Indians in Venezuela

Hepatitis Branch, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA¹
Second Department of Medicine, Nagoya City University Medical School, Nagoya 467-8601, Japan²

Author for correspondence: Betty H. Robertson. Fax +1 404 639 1563. e-mail bjr1{at}cdc.gov

The complete genome sequences of hepatitis B virus (HBV) from 12 HBV-infected Yucpa Indians of Venezuela, a group with highly endemic HBV, were amplified and sequenced. The 12 isolates were closely related to each other, with 98·6–100% nucleotide identity. A phylogenetic tree based on the complete genome indicated clearly that they were genotype F. Three individuals had evidence of infection with two different HBV deletion mutants. In two individuals, a three amino acid deletion was identified just prior to the ‘a’ determinant loop of the S region. A third individual was infected with virus that contained a complete core reading frame and a population that contained a deletion in the middle of the core region. These results indicate that genotype F HBV is present in the Venezuelan Yucpa Amerindians and the complete genome sequence allowed the identification of two unique deletion mutants in a limited set of samples.

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