Characteristics of the X gene of hepatitis B virus

Szecheng J. Lo*, Mei Ling Chien, Yan-Hwa Wu Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


The 465-nucleotide sequence of the X gene from our cloned hepatitis B virus (HBV) DNA (subtype adw) was determined and compared to the same gene of 10 other published HBV sequences (3 of adw, 4 of adr, 2 of ayw, and 1 of ayr). We found (1) a total of 56 base differences among the 11 sequences (without counting the 27-base deletion in one adr) which resulted in 88% nucleotide homology, and (ii) 5 pairs of repeated sequence (3 direct repeats and 2 inverted repeats) that were highly conserved. Comparison of the protein amino acid sequences indicated that (i) there is 80% amino acid homology in total, and (ii) there are four highly conserved cysteine residues. In addition, the X gene of the adw subtype is more conserved than that of adr.

Original languageEnglish
Pages (from-to)289-292
Number of pages4
Issue number1
StatePublished - 1 Jan 1988


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