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A Defective RNA Associated with Bamboo Mosaic Virus and the Possible Common Mechanisms for RNA Recombination in Potexviruses

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Abstract

A naturally occurring 1.1 kb RNA was isolated from purified virions of bamboo mosaic potexvirus isolate S (BaMV-S). This RNA is a defective RNA (D RNA) derived from a single internal deletion of the BaMV genome. A cDNA clone representing the complete nucleotide sequence of the BaMV-S D RNA was generated and its nucleotide sequence was determined. The BaMV D cDNA is 1015 nts in length [excluding the poly(A) tail] and consists of two regions corresponding to 867 nts of the 5′ terminus and 148 nts of the 3′ terminus of the BaMV genomic RNA. BaMV D cDNA contains a single open reading frame (ORF) encoding a putative 29.7 kDa protein comprised of a fusion of the first 258 amino acids of BaMV ORF 1 and the last 2 amino acids of coat protein. The coding capacity of D RNA was verified by in vitro translation of native BaMV-S D RNA and of 1.1 kb RNA transcribed in vitro from the full-length D cDNA. BaMV D RNA can be reproducibly generated by serial passages of BaMV-S in Nicotiana benthamiana and is the first D RNA in the potexvirus group shown to be generated de novo. Alignments of sequences surrounding the 5′ and 3′ junction borders of reported potexvirus D RNAs reveal a 65.2–84.6% sequence identity, suggesting that common mechanisms for viral RNA recombination are involved in the generation of potexvirus D RNAs.

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Authors and Affiliations

  1. Academia Sinica, Institute of Botany, Taipei, Taiwan, 115, Republic of China

    Ting-Yu Yeh, Biing-Yuan Lin & Na-Sheng Lin

  2. Department of Plant Pathology, National Taiwan University, Taipei, Taiwan, 106, Republic of China

    Ya-Chun Chang

  3. Agricultural Biotechnology Laboratories, National Chung Hsing University, Taichung, Taiwan, 400, Republic of China

    Yau-Heiu Hsu

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  1. Ting-Yu Yeh
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  2. Biing-Yuan Lin
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  3. Ya-Chun Chang
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  4. Yau-Heiu Hsu
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  5. Na-Sheng Lin
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Yeh, TY., Lin, BY., Chang, YC. et al. A Defective RNA Associated with Bamboo Mosaic Virus and the Possible Common Mechanisms for RNA Recombination in Potexviruses. Virus Genes 18, 121–128 (1999). https://doi.org/10.1023/A:1008008400653

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