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      Near-Full-Length Genome Sequence of a Novel Reovirus from the Chinese Mitten Crab, Eriocheir sinensis

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      Author(s): a,b , , b , b
      Publication date (Electronic):
      Journal: Genome Announcements
      Publisher: American Society for Microbiology

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          Abstract

          A novel Eriocheir sinensis reovirus (EsRV) was identified using deep-sequencing techniques in crabs afflicted with trembling disease (TD). Near-full-length genome sequences of 12 segments of EsRV were obtained. The genome of EsRV will facilitate further studies on the causative agent of TD.

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          Complete characterisation of the American grass carp reovirus genome (genus Aquareovirus: family Reoviridae) reveals an evolutionary link between aquareoviruses and coltiviruses.

          Houssam Attoui, Qin Fang, Mourad Belhouchet … (2008)
          An aquareovirus was isolated from several fish species in the USA (including healthy golden shiners) that is not closely related to members of species Aquareovirus A, B and C. The virus, which is atypical (does not cause syncytia in cell cultures at neutral pH), was implicated in a winter die-off of grass carp fingerlings and has therefore been called 'American grass carp reovirus' (AGCRV). Complete nucleotide sequence analysis of the AGCRV genome and comparisons to the other aquareoviruses showed that it is closely related to golden ide reovirus (GIRV) (>92% amino acid [aa] identity in VP5(NTPase) and VP2(Pol)). However, comparisons with grass carp reovirus (Aquareovirus C) and chum salmon reovirus (Aquareovirus A) showed only 22% to 76% aa identity in different viral proteins. These findings have formed the basis for the recognition of AGCRV and GIRV as members of a new Aquareovirus species 'Aquareovirus G' by ICTV. Further sequence comparisons to other members of the family Reoviridae suggest that there has been an 'evolutionary jump,' involving a change in the number of genome segments, between the aquareoviruses (11 segments) and coltiviruses (12 segments). Segment 7 of AGRCV encodes two proteins, from two distinct ORFs, which are homologues of two Coltivirus proteins encoded by genome segments 9 and 12. A similar model has previously been reported for the rotaviruses and seadornaviruses.
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            Expansion of family Reoviridae to include nine-segmented dsRNA viruses: isolation and characterization of a new virus designated Aedes pseudoscutellaris reovirus assigned to a proposed genus (Dinovernavirus).

            Philippe Biagini, Jean-Francois Cantaloube, Philippe De Wals … (2005)
            Family Reoviridae is known, by definition, to contain dsRNA viruses with 10-12 genome segments. We report here the characterization of the first member of this family with a nine-segmented genome. This virus was isolated from Aedes pseudoscutellaris mosquito cells and designated aedes pseudoscutellaris reovirus (APRV). Virions are single-shelled with turrets but are non-occluded by contrast to cypoviruses. APRV replicates in various mosquito cell lines, but not in mice or mammalian cells. Complete sequence analysis showed that APRV is phylogenetically related to cypoviruses, fijiviruses and oryzaviruses. The maximum amino acid identities with cypoviruses, oryzaviruses or fijiviruses in the polymerase, are compatible with values observed between these genera and lower than values within a given genus. This suggests that APRV should be classified within a new genus that we designated Dinovernavirus (sigla from D: Double-stranded, i: insect, nove: nine from the latin "novem", rna: RNA, virus) in family Reoviridae.
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              Micromonas pusilla reovirus: a new member of the family Reoviridae assigned to a novel proposed genus (Mimoreovirus).

              Philippe De Wals, Corina P D Brussaard, Mourad Belhouchet … (2006)
              Micromonas pusilla reovirus (MpRV) is an 11-segmented, double-stranded RNA virus isolated from the marine protist Micromonas pusilla. Sequence analysis (including conserved termini and presence of core motifs of reovirus polymerase), morphology and physicochemical properties confirmed the status of MpRV as a member of the family Reoviridae. Electron microscopy showed that intact virus particles are unusually larger (90-95 nm) than the known size of particles of viruses belonging to the family Reoviridae. Particles that were purified on caesium chloride gradients had a mean size of 75 nm (a size similar to the size of intact particles of members of the family Reoviridae), indicating that they lost outer-coat components. The subcore particles had a mean size of 50 nm and a smooth surface, indicating that MpRV belongs to the non-turreted Reoviridae. The maximum amino acid identity with other reovirus proteins was 21 %, which is compatible with values existing between distinct genera. Based on morphological and sequence findings, this virus should be classified as the representative of a novel genus within the family Reoviridae, designated Mimoreovirus (from Micromonas pusilla reovirus). The topology of the phylogenetic tree built with putative polymerase sequences of the family Reoviridae suggested that the branch of MpRV could be ancestral. Further analysis showed that segment 1 of MpRV was much longer (5792 bp) than any other reovirus segment and encoded a protein of 200 kDa (VP1). This protein exhibited significant similarities to O-glycosylated proteins, including viral envelope proteins, and is likely to represent the additional outer coat of MpRV.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Genome Announc
                Journal ID (iso-abbrev): Genome Announc
                Journal ID (hwp): ga
                Journal ID (pmc): ga
                Journal ID (publisher-id): GA
                Title: Genome Announcements
                Publisher: American Society for Microbiology (1752 N St., N.W., Washington, DC )
                ISSN (Electronic): 2169-8287
                Publication date (Electronic): 21 May 2015
                Publication date Collection: May-Jun 2015
                Volume: 3
                Issue: 3
                Electronic Location Identifier: e00447-15
                Affiliations
                [a ]Freshwater Fisheries Research Center, Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Chinese Academy of Fishery Sciences, Wuxi, China
                [b ]Wuxi Fisheries College, Nanjing Agricultural University, Nanjing, China
                Author notes
                Address correspondence to Huaishun Shen, shenhs@ 123456ffrc.cn .
                Article
                Publisher ID: genomeA00447-15
                DOI: 10.1128/genomeA.00447-15
                PMC ID: 4440949
                PubMed ID: 25999569
                SO-VID: 67ebf174-3f0f-4317-a991-d5db13d8b7cd
                Copyright © Copyright © 2015 Shen et al.
                License:

                This is an open-access article distributed under the terms of the Creative Commons Attribution 3.0 Unported license.

                History
                Date received : 2 April 2015
                Date accepted : 17 April 2015
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 9, Pages: 2, Words: 1093
                Categories
                Subject: Viruses
                Custom metadata
                cover-date May/June 2015
                access-type free

                ScienceOpen disciplines: Genetics
                Data availability:
                ScienceOpen disciplines: Genetics

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