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      ICTV Virus Taxonomy Profile: Ophioviridae


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          The Ophioviridae is a family of filamentous plant viruses, with single-stranded negative, and possibly ambisense, RNA genomes of 11.3–12.5 kb divided into 3–4 segments, each encapsidated separately. Virions are naked filamentous nucleocapsids, forming kinked circles of at least two different contour lengths. The sole genus, Ophiovirus, includes seven species. Four ophioviruses are soil-transmitted and their natural hosts include trees, shrubs, vegetables and bulbous or corm-forming ornamentals, both monocots and dicots. This is a summary of the International Committee on Taxonomy of Viruses (ICTV) Report on the taxonomy of the Ophioviridae, which is available at http://www.ictv.global/report/ophioviridae.

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          Most cited references7

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          A new ophiovirus is associated with blueberry mosaic disease.

          Blueberry mosaic disease (BMD) was first described more than 60 years ago and is caused by a yet unidentified graft transmissible agent. A combination of traditional methods and next generation sequencing disclosed the presence of a new ophiovirus in symptomatic plants. The virus was detected in all BMD samples collected from several production areas of North America and was thus named blueberry mosaic associated virus. Phylogenetic analysis, supported by high bootstrap values, places the virus within the family Ophioviridae. The genome organization resembles that of citrus psorosis virus, the type member of the genus Ophiovirus. The implications of this discovery in BMD control and blueberry virus certification schemes are also discussed.
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            The closely related citrus ringspot and citrus psorosis viruses have particles of novel filamentous morphology.

            Some properties of the particles of citrus ringspot virus (CtRSV) and the related citrus psorosis-associated virus (CPsAV) are described. The particles of CtRSV have been reported to be sinuous linear structures about 10 nm in diameter and of two lengths (300 to 500 nm and 1500 to 2500 nm) representing 'top' and 'bottom' sedimentation components. We show that these particles are collapsed double-stranded forms of nucleocapsid-like, highly flexuous open circles formed of filaments 3 to 4 nm in diameter. Top-component filaments had contour lengths of 600 to 1000 nm, i.e. twice that reported for the corresponding collapsed form. Bottom-component filaments had contour lengths about four times longer than those of top-component filaments. The structures suggest that CtRSV represents a new genus (possibly family) related to the tenuiviruses. However, we failed to demonstrate any serological relationship between CtRSV and several tenuiviruses; moreover, the capsid protein sizes and host ranges are quite different. We offer the name Ophiovirus for the proposed new genus.
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              Nucleotide sequence and genomic organization of an ophiovirus associated with lettuce big-vein disease.

              The complete nucleotide sequence of an ophiovirus associated with lettuce big-vein disease has been elucidated. The genome consisted of four RNA molecules of approximately 7.8, 1.7, 1.5 and 1.4 kb. Virus particles were shown to contain nearly equimolar amounts of RNA molecules of both polarities. The 5'- and 3'-terminal ends of the RNA molecules are largely, but not perfectly, complementary to each other. The virus genome contains seven open reading frames. Database searches with the putative viral products revealed homologies with the RNA-dependent RNA polymerases of rhabdoviruses and Ranunculus white mottle virus, and the capsid protein of Citrus psorosis virus. The gene encoding the viral polymerase appears to be located on the RNA segment 1, while the nucleocapsid protein is encoded by the RNA3. No significant sequence similarities were observed with other viral proteins. In spite of the morphological resemblance with species in the genus Tenuivirus, the ophioviruses appear not to be evolutionary closely related to this genus nor any other viral genus.

                Author and article information

                J Gen Virol
                J. Gen. Virol
                The Journal of General Virology
                Microbiology Society
                June 2017
                21 June 2017
                21 June 2017
                : 98
                : 6
                : 1161-1162
                [ 1] Instituto de Biotecnología y Biología Molecular, Universidad de La Plata , La Plata, Argentina
                [ 2] Facultad de Ciencias Agrarias y Forestales, Universidad de La Plata , La Plata, Argentina
                [ 3] Texas A and M University-Kingsville, Citrus Center , Weslaco, USA
                [ 4] Department of Molecular Signal Processing, Leibniz Institute of Plant Biochemistry , Halle (Saale), Germany
                [ 5] U.S. Department of Agriculture, Agricultural Research Service , Beltsville, Maryland, USA
                [ 6] Centro de Protección Vegetal y Biotecnología, Instituto Valenciano de Investigaciones, Agrarias, Moncada , Valencia, Spain
                [ 7] Faculty of Agriculture, Utsunomiya University, Utsunomiya , Japan
                [ 8] Instituto de Biología Molecular y Celular de plantas (IBMCP), Universidad Politécnica de Valencia-Consejo Superior de Investigaciones Científicas , Valencia, Spain
                [ 9] Department of Planning and Coordination, National Agriculture and Food Research Organization , Tsukuba, Japan
                [ 10] Department of Plant Pathology, Division of Agriculture, University of Arkansas , USA
                [ 11] Institute for Sustainable Plant Protection (IPSP) – CNR, Torino , Italy
                [ 12] Wageningen Plant Research, Wageningen University and Research , Wageningen, The Netherlands
                Author notes
                *Correspondence: María Laura García, marialauragarcia2010@ 123456gmail.com

                This is an open access article under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.

                : 10 May 2017
                : 12 May 2017
                Funded by: Wellcome Trust (GB)
                Award ID: WT108418AIA
                ICTV Virus Taxonomy Profile
                RNA Viruses
                Custom metadata

                Microbiology & Virology
                ophioviridae,ictv,taxonomy,citrus psorosis virus,mirafiori lettuce big-vein virus,lettuce ring necrosis virus,blueberry mosaic associated virus


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