The genome of the nucleopolyhedrosis-causing virus from Tipula oleracea sheds new light on the nudiviridae family - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Virology Année : 2015

The genome of the nucleopolyhedrosis-causing virus from Tipula oleracea sheds new light on the nudiviridae family

Résumé

A large double-stranded DNA (dsDNA) virus that produces occlusion bodies, typical of baculoviruses, has been described to infect crane fly larvae of the genus Tipula (Diptera, Tipulidae). Because of a lack of genomic data, this virus has remained unclassified. Electron microscopy of an archival virus isolated from Tipula oleracea, T. oleracea nudivirus (ToNV), showed irregularly shaped occlusion bodies measuring from 2 to 5 min length and 2 min middiameter, filled with rod-shape virions containing single nucleocapsids within a bilayer envelope. Whole-genome amplification and Roche 454 sequencing revealed a complete circular genome sequence of 145.7 kb, containing five direct repeat regions. We predicted 131 open reading frames, including a homolog of the polyhedrin gene encoding the major occlusion body protein of T. paludosa nucleopolyhedrovirus (NPV). BLAST searches demonstrated that ToNV had 21 of the 37 baculovirus core genes but shared 52 genes with nudiviruses (NVs). Phylogenomic analyses indicated that ToNV clearly belongs to the Nudiviridae family but should probably be assigned to a new genus. Among nudiviruses, ToNV was most closely related to the Penaeus monodon NV and Heliothis zea NV clade but distantly related to Drosophila innubia NV, the other nudivirus infecting a Diptera. Lastly, ToNV was found to be most closely related to the nuvidirus ancestor of bracoviruses. This was also reflected in terms of gene content, as ToNV was the only known exogenous virus harboring homologs of the Cc50C22.6 and 27b (Cc50C22.7) genes found in the nudiviral genomic cluster involved in bracovirus particle production.

Domaines

Virologie

Dates et versions

hal-01315465 , version 1 (17-05-2016)

Identifiants

Citer

Annie Bezier, Julien Thézé, Frédérick F. Gavory, Julien Gaillard, Julie Poulain, et al.. The genome of the nucleopolyhedrosis-causing virus from Tipula oleracea sheds new light on the nudiviridae family. Journal of Virology, 2015, 89 (6), pp.3008-3025. ⟨10.1128/JVI.02884-14⟩. ⟨hal-01315465⟩
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