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Journal of General Virology (2001), 82, 373-378.
© 2001 Society for General Microbiology

Animal: DNA Viruses

Sequence comparison of an Australian duck hepatitis B virus strain with other avian hepadnaviruses

Miriam Triyatnib,1, Peter L. Ey1, Thien Tran1, Marc Le Mire1, Ming Qiao2, Christopher J. Burrell1,2 and Allison R. Jilbert1,2

Hepatitis Virus Research Laboratory, Department of Molecular Biosciences, Adelaide University, North Terrace, Adelaide SA 5005, Australia1
Institute of Medical and Veterinary Science, Adelaide SA 5000, Australia2

Author for correspondence: Allison Jilbert (at Department of Molecular Biosciences). Fax +61 8 8303 7532. e-mail allison.jilbert{at}adelaide.edu.au

The genome of an Australian strain of duck hepatitis B virus (AusDHBV) was cloned from a pool of congenitally DHBV-infected-duck serum, fully sequenced and found by phylogenetic analyses to belong to the ‘Chinese’ DHBV branch of the avian hepadnaviruses. Sequencing of the Pre-S/S gene of four additional AusDHBV clones demonstrated that the original clone (pBL4.8) was representative of the virus present in the pool, and a head-to-tail dimer of the clone was infectious when inoculated into newly hatched ducks. When the published sequences of 20 avian hepadnaviruses were compared, substitutions or deletions in the polymerase (POL) gene were most frequent in the 500 nt segment encoding the ‘spacer’ domain that overlaps with the Pre-S domain of the Pre-S/S gene in a different reading frame. In contrast, substitutions and deletions were rare within the adjacent segment that encodes the reverse transcriptase domain of the POL protein and the S domain of the envelope protein, presumably because they are more often deleterious.




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