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Sequence analysis of a reovirus isolated from the winter moth Operophtera brumata (Lepidoptera: Geometridae) and its parasitoid Phobocampe tempestiva (Hymenoptera: Ichneumonidae)

Research output: Contribution to journalJournal article

Published

  • Robert Iain Graham
  • Shujing Rao
  • Rosemary Hails
  • Steven Sait
  • Houssam Attoui
  • Peter Mertens
  • Robert Possee
Journal publication date2008
JournalVirus Research
Journal number1
Volume135
Number of pages6
Pages42-47
Original languageEnglish

Abstract

A reovirus was isolated from Operophtera brumata (ObRV) and its parasitoid wasp Phobocampe tempestiva. Each of the 10 dsRNA genome segments of ObRV was sequenced and shown to contain a single open reading frame (ORF). Conserved motifs ([+ve] 5′-AAATAAA … G/TAGGTT-3′) were found at the termini of each segment, with the exception of Seg-6 and Seg-8, where the 5′ termini were 5′-AACAAA…-3′. The putative proteins encoded by each segment were compared with those of other members of the family Reoviridae. Phylogenetic comparisons to published sequences for the RNA-dependent RNA polymerase genes from other reoviruses indicated that ObRV is most closely related to members of the genus Cypovirus. However, unlike the cypoviruses, ObRV has a double-layered capsid structure. When the protein encoded by ObRV Seg-10 was expressed (by inserting the open reading frame into a baculovirus expression vector) no ‘occlusion bodies’ were observed in the recombinant baculovirus infected insect cell cultures. This suggests that unlike the cypoviruses, Seg-10 of ObRV does not contain a polyhedrin gene. Further phylogenetic comparisons also identified relationships between Seg-2 and Seg-10 of ObRV, and genes of Diadromus pulchellus Idnoreovirus 1 (DpIRV1), suggesting that ObRV represents a new species from the genus Idnoreovirus.