title: The IL-10 homologue encoded by cyprinid herpesvirus 3 is essential neither for viral replication in vitro nor for virulence in vivo.
abstract: Cyprinid herpesvirus 3 (CyHV-3), a member of the family Alloherpesviridae, is the causative agent of a lethal disease in common and koi carp. CyHV-3 ORF134 encodes an interleukin-10 (IL-10) homologue. The present study was devoted to this ORF. Transcriptomic analyses revealed that ORF134 is expressed as a spliced gene belonging to the early-late class. Proteomic analyses of CyHV-3 infected cell supernatant demonstrated that the ORF134 expression product is one of the most abundant proteins of the CyHV-3 secretome. To investigate the role of ORF134 in viral replication in vitro and in virulence in vivo, a deleted strain and a derived revertant strain were produced using BAC cloning technologies. The recombinant ORF134 deleted strain replicated in vitro comparably to the parental and the revertant strains. Infection of fish by immersion in water containing the virus induced comparable CyHV-3 disease for the three virus genotypes tested (wild type, deleted and revertant). Quantification of viral DNA by real time TaqMan PCR (in the gills and the kidney) and analysis of carp cytokine expression (in the spleen) by RT-qPCR at different times post-infection did not revealed any significant difference between the groups of fish infected with the three virus genotypes. Similarly, histological examination of the gills and the kidney of infected fish revealed no significant differences between fish infected with ORF134 deleted virus versus fish infected with the control parental or revertant strains. All together, the results of the present study demonstrate that the IL-10 homologue encoded by CyHV-3 is essential neither for viral replication in vitro nor for virulence in common carp.
authors.affiliation: Immunology-Vaccinology (B43b), Department of Infectious and Parasitic Diseases (B43b), Faculty of Veterinary Medicine, University of Liège, Liège, B-4000, Belgium. a.vdplasschen@ulg.ac.be.
authors.forename: Ping
authors.initials: P
authors.lastname: Ouyang
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Rakus
authors.forename: Maxime
authors.initials: M
authors.lastname: Boutier
authors.forename: Anca
authors.initials: A
authors.lastname: Reschner
authors.forename: Baptiste
authors.initials: B
authors.lastname: Leroy
authors.forename: Maygane
authors.initials: M
authors.lastname: Ronsmans
authors.forename: Guillaume
authors.initials: G
authors.lastname: Fournier
authors.forename: Sophie
authors.initials: S
authors.lastname: Scohy
authors.forename: Bérénice
authors.initials: B
authors.lastname: Costes
authors.forename: Ruddy
authors.initials: R
authors.lastname: Wattiez
authors.forename: Alain
authors.initials: A
authors.lastname: Vanderplasschen
mesh_terms: D000818:Animals; D002347:Carps; D016207:Cytokines / Q000235:genetics / Q000378:metabolism; D004266:DNA Virus Infections / Q000662:veterinary* / Q000821:virology; D004267:DNA Viruses / Q000472:pathogenicity* / Q000502:physiology*; D004279:DNA, Viral / Q000235:genetics / Q000378:metabolism; D005393:Fish Diseases / Q000821:virology*; D005786:Gene Expression Regulation; D005880:Gills / Q000378:metabolism; D016753:Interleukin-10 / Q000235:genetics* / Q000378:metabolism; D007668:Kidney / Q000378:metabolism; D060888:Real-Time Polymerase Chain Reaction / Q000662:veterinary; D013154:Spleen / Q000378:metabolism; D014774:Virulence; D014779:Virus Replication
chemical_list: D016207:Cytokines; D004279:DNA, Viral; D016753:Interleukin-10