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Biology and Genetic Characterization of Fish and Amphibian Herpesviruses

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Biology and Genetic Characterization of Fish and Amphibian Herpesviruses Biology and Genetic Characterization of Fish and Amphibian Herpesviruses Thomas B. Waltzek, Tomofumi Kurobe, Garry O. Kelley, Michael E. Alfaro, Andrew J. Davison, Ronald P. Hedrick Fish Health Program School of Veterinary Medicine University of California, Davis Herpesviruses from Fish and Amphibians List in accordance with the 8th Report of the ICTV Designation Host Reference Cyprinid herpesvirus 1 (CyHV1, CHV) Cyprinus carpio Sano et al. 1985 Cyprinid herpesvirus 2 (CyHV2, GFHNV) Carassius auratus Jung & Miyazaki 1995 Cyprinid herpesvirus 3 (CyHV3, KHV, CNGV) Cyprinus carpio Hedrick et al., 2000 Ictalurid herpesvirus 1 (IcHV1, CCV) Ictalurus punctatus Fijan et al.1970 Ictalurid herpesvirus 2 (IcHV2) Ameirius melas & I. punctatus Hedrick et al. 2003 Anguillid herpesvirus 1 (AngHV1) Anguilla japonicus & anguilla Sano et al. 1988 Acipenserid herpesvirus 1 (AciHV1) Acipenser transmontanus Hedrick et al. 1991 Acipenserid herpesvirus 2 (AciHV2) Acipenser transmontanus Watson et al. 1995 Salmonid herpesvirus 1 (SalHV1) Oncorhynchus mykiss Wolf & Taylor 1975 Salmonid herpesvirus 2 (SalHV2)(NeVTA) Oncorhynchus nerka Sano, 1976 Salmonid herpesvirus 2 (SalHV2)(OMV) Oncorhynchus masou Kimura et al., 1981 Salmonid herpesvirus 3 (SalHV3, EEDV) Salvelinus namaycush McAllister & Herman, 1989 Esocid herpesvirus 1 (EsHV1) Esox lucius & masquinongy Yamamoto et al., 1983 Percid Herpesvirus 1 (PeHV1) Sander vitreus Kelley et al., 1983 Ranid herpesvirus 1 (RaHV1) Rana pipiens Granoff et al. 1989 Ranid herpesvirus 2 (RaHV2) Rana pipiens Rafferty, 1965 1 Relationships of the Fish 87 100 67 & Amphibian Herpesviruses" 99 99 100 • Bayesian and ML analyses from the 92 99 100 100 partial deduced amino acid DNA Clade 2 99 polymerase and terminase genes 100 98 100 100 100 51 87 65 79 71 84 96 100 89 94 Clade 1 99 100 (KHV) 95 100 100 100 Taxonomic Changes to the Fish & Amphibian Herpesviruses • KHV ICTV designation is Cyprinid herpesvirus 3 (CyHV3) Ictalurivirus • Three new genera (Waltzek et al., 2009) * Clade 1 - Cyprinivirus (CyHV1-3) * Clade 2 Salmonivirus - Ictalurivirus (IcHV1 & 2, AciHV2) - Salmonivirus (SalHV1-3) - Batrachovirus (RaHV1 & 2) Clade 2 Batrachovirus Cyprinivirus Clade 1 2 Herpesvirales Herpesvirales evolutionary hypothesis (Davison, 2000) 1. Mammals, reptiles, birds 2. Fish & amphibians 3. Mollusk (Oyster) Bayesian analysis from the deduced amino acid terminase gene (Waltzek et al., 2009) 100 99 Order: 100 100 100 α 100 100 100 100 100 Herpesvirales Herpesvirales 100 100 100 92 100 Herpesviridae / 100 β (Avian Reptilian//Mammalian) 100 100 100 100 91 100 97 γ 100 100 100 Malacoherpesviridae (Oyster) 100 14 conserved genes 100 Alloherpesviridae (Fish/Amphibian) 100 100 100 3 Herpesvirus Taxonomy • Distant relationships of the fish & amphibian, oyster, and mammalian, avian, & reptilian herpesviruses supports the erection of a new order (Waltzek et al., 2009) Herpesvirales Herpesviridae (mammalian, avian, & reptilian HVs) Alphaherpesvirinae Betaherpesvirinae Gammaherpesvirinae Alloherpesviridae (Fish and amphibian HVs) Ictalurivirus Cyprinivirus Salmonivirus Batrachovirus Malacoherpesviridae (Oyster HV) Ostreavirus Multiple origins of oncogenesis within the Alloherpesviridae Neoplasia inducing agents Oncogene ??? Photo by T. Kimura Photo by S. MarcquenskiPhoto by T. Kimura 4 Latency within the Alloherpesviridae Neoplasia inducing agents Latent infection ????? ????? ????? Host fidelity within the Alloherpesviridae 5 Future directions: characterization of emerging alloherpesviruses H&E illustrating gill lesions associated with ACHVD • Marine finfish epizootics – Flounder HV – Pilchard HV – Smooth dogfish HV – White sea bass HV – Atlantic cod HV (ACHV) Gross photo illustrating discus HV epizootic • Freshwater ornamental epizootics – Discus and angelfish HV – Guppy HV – et al… Future directions: functional phylogenomics • Current genome sequencing projects – SalHV1 (Davison et al., in prep.) – CyHV1 & 2 (Hedrick et al., in prep.) – Others alloherpes, irido, pox, & adeno soon… • Test gene function by gene KO – CyHV3 immunomodulatory genes (pathogenesis) – CyHV1 JunB oncogene (oncogenesis) Gene KO in BAC Wild type virus Mutant virus 6 Thank you for your attention! Questions? 7 .
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