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J Virol. 1985 December; 56(3): 978-986

Nucleotide sequence of a cloned woodchuck hepatitis virus genome: evolutional relationship between hepadnaviruses.

ABSTRACT

We have determined the complete nucleotide sequence of a cloned DNA of woodchuck hepatitis virus (WHV), the most oncogenic virus among hepadnaviruses. The genome, designated WHV2, is 3,320 base pairs long and contains four major open reading frames (ORFs) coded on the same strand of nucleotide sequence as in the human hepatitis B virus (HBV) genome. Comparison of the nucleotide sequence and amino acid sequences deduced from it among the genomes of various hepadnaviruses demonstrates that each protein shows an intrinsic property in conserving its amino acid sequence. A parameter, the ratio of the number of triplets with one-letter change but no amino acid substitution to the total number of triplets in which one-letter change occurred, was introduced to measure the intrinsic properties quantitatively. For each ORF, the parameter gave characteristic values in all combinations. Therefore, the relative evolutional distance between these hepadnaviruses can be measured by the amino acid substitution rate of any ORF. These comparisons suggest that (i) the difference between two WHV clones, WHV1 and WHV2, corresponds to that among clones of a HBV subtype, HBVadr, and (ii) WHV and ground squirrel hepatitis virus can be categorized in a way similar to the subgroups of HBV.

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