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Putative Replication Intermediates in Endornavirus, a Novel Genus of Plant dsRNA Viruses

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Abstract

Oryza sativa endornavirus(OSV) belongs to a new genus (Endornavirus) and family (Endoviridae)with members containing large double-stranded RNA (dsRNA) replicons with plasmid-like properties. Analysis of products obtained from in vitroreaction of the OSV RNA-dependent RNA polymerase revealed a rapid increase of a population of the non-coding strand RNA molecules with a head-to-tail composition. Northern hybridization of total RNA from OSV-carrier cells with riboprobes specific for the coding strand RNA, revealed two types of RNA molecules (i) with a site specific nick and (ii) full-length unnicked molecules. Quantitative analyses of these RNAs showed about 50-fold higher amounts of full-length unnicked molecules in cultured cells in which the OSV copy number increases compared with those found in the seedling cells. Both the head-to-tail linked non-coding strand and the full-length coding strand molecules were also found in wild rice and broad beans infected with other endornaviruses indicating that the presence of these unique types of RNA molecules should be considered as a characteristic feature of Endoviridae.

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Authors and Affiliations

  1. Department of Applied Biological Sciences, Tokyo University of Agriculture and Technology, Saiwaicho 3-5-8, Tokyo, Japan

    Hideki Horiuchi & Toshiyuki Fukuhara

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  1. Hideki Horiuchi
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  2. Toshiyuki Fukuhara
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Horiuchi, H., Fukuhara, T. Putative Replication Intermediates in Endornavirus, a Novel Genus of Plant dsRNA Viruses. Virus Genes 29, 365–375 (2004). https://doi.org/10.1007/s11262-004-7441-0

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