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Novel hepatitis D-like agents in vertebrates and invertebrates
Univ Sydney, Charles Perkins Ctr, Marie Bashir Inst Infect Dis & Biosecur, Sch Life & Environm Sci, Sydney, NSW 2006, Australia;Univ Sydney, Charles Perkins Ctr, Marie Bashir Inst Infect Dis & Biosecur, Sydney Med Sch, Sydney, NSW 2006, Australia.ORCID iD: 0000-0003-0991-6827
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Biochemistry and Microbiology. Univ Sydney, Charles Perkins Ctr, Marie Bashir Inst Infect Dis & Biosecur, Sch Life & Environm Sci, Sydney, NSW 2006, Australia;Univ Sydney, Charles Perkins Ctr, Marie Bashir Inst Infect Dis & Biosecur, Sydney Med Sch, Sydney, NSW 2006, Australia.ORCID iD: 0000-0001-6665-7492
Univ Sydney, Charles Perkins Ctr, Marie Bashir Inst Infect Dis & Biosecur, Sch Life & Environm Sci, Sydney, NSW 2006, Australia;Univ Sydney, Charles Perkins Ctr, Marie Bashir Inst Infect Dis & Biosecur, Sydney Med Sch, Sydney, NSW 2006, Australia.
Univ Sydney, Charles Perkins Ctr, Marie Bashir Inst Infect Dis & Biosecur, Sch Life & Environm Sci, Sydney, NSW 2006, Australia;Univ Sydney, Charles Perkins Ctr, Marie Bashir Inst Infect Dis & Biosecur, Sydney Med Sch, Sydney, NSW 2006, Australia.
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2019 (English)In: VIRUS EVOLUTION, ISSN 2057-1577, Vol. 5, no 2, article id vez021Article in journal (Refereed) Published
Abstract [en]

Hepatitis delta virus (HDV) is the smallest known RNA virus, encoding a single protein. Until recently, HDV had only been identified in humans, where it is strongly associated with co-infection with hepatitis B virus (HBV). However, the recent discovery of HDV-like viruses in metagenomic samples from birds and snakes suggests that this virus has a far longer evolutionary history. Herein, using additional meta-transcriptomic data, we show that highly divergent HDV-like viruses are also present in fish, amphibians, and invertebrates, with PCR and Sanger sequencing confirming the presence of the invertebrate HDV-like viruses. Notably, the novel viruses identified here share genomic features characteristic of HDV, such as a circular genome of only approximately 1.7 kb in length, and self-complementary, unbranched rod-like structures. Coiled-coil domains, leucine zippers, conserved residues with essential biological functions, and isoelectronic points similar to those in the human hepatitis delta virus antigens (HDAgs) were also identified in the putative non-human viruses. Importantly, none of these novel HDV-like viruses were associated with hepadnavirus infection, supporting the idea that the HDV-HBV association may be specific to humans. Collectively, these data not only broaden our understanding of the diversity and host range of HDV, but also shed light on its origin and evolutionary history.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2019. Vol. 5, no 2, article id vez021
Keywords [en]
hepatitis D virus, evolution, fish, termites, meta-transcriptomics, phylogeny
National Category
Microbiology in the medical area
Identifiers
URN: urn:nbn:se:uu:diva-402655DOI: 10.1093/ve/vez021ISI: 000503879300005PubMedID: 31321078OAI: oai:DiVA.org:uu-402655DiVA, id: diva2:1387047
Funder
Swedish Research Council Formas, 2015-710Australian Research Council, FL170100022Australian Research Council, FT160100463Available from: 2020-01-20 Created: 2020-01-20 Last updated: 2020-01-20Bibliographically approved

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