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Identification of a novel plant RNA virus species of the genus Amalgavirus in the family Amalgaviridae from chia (Salvia hispanica)

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Abstract

Background

Chia (Salvia hispanica) is a flowering plant in the family Lamiaceae, which produces seeds that are a rich source of various nutritional compounds.

Objective

To identify a novel RNA virus potentially associated with chia.

Methods

Transcriptome data obtained from developing chia seeds were assembled into contigs. Sequence contigs containing an open reading frame (ORF) that showed amino acid identities with a viral RNA-dependent RNA polymerase (RdRp) were identified and analyzed.

Results

A genomic sequence of a novel plant RNA virus named Salvia hispanica RNA virus 1 (ShRV1) was identified in a chia seed transcriptome dataset. The ShRV1 genome sequence has two ORFs that showed high sequence identities with ORFs of known members of the genus Amalgavirus in the family Amalgaviridae. Amalgaviridae is a family of positive-sense double-stranded non-segmented RNA viruses that infect plants, fungi, and animals. The ShRV1 genome encodes two proteins: a putative replication factory matrix-like protein from ORF1 and an RdRp from the fused ORF of ORF1 and ORF2 by a + 1 programmed ribosomal frameshifting (PRF) mechanism. A conserved + 1 PRF motif sequence UUU_CGU was found at the ORF1/ORF2 boundary. A comparison of 31 amalgavirus ORF1 + 2 fusion proteins revealed that only three positions were repeatedly used as a + 1 PRF site during amalgavirus evolution.

Conclusion

ShRV1 is a novel virus found to be associated with chia and may be useful for studying the molecular features of amalgaviruses.

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Acknowledgements

This research was supported by the Chung-Ang University Research Scholarship Grants in 2018 and by the National Research Foundation of Korea funded by the Government of Korea (Grant No. NRF-2018R1A5A1025077).

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Authors and Affiliations

  1. Department of Life Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, South Korea

    Ji Seok Lee, Chul Jun Goh, Dongbin Park & Yoonsoo Hahn

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  1. Ji Seok Lee
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  2. Chul Jun Goh
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  3. Dongbin Park
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  4. Yoonsoo Hahn
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Correspondence to Yoonsoo Hahn.

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Lee, J.S., Goh, C.J., Park, D. et al. Identification of a novel plant RNA virus species of the genus Amalgavirus in the family Amalgaviridae from chia (Salvia hispanica). Genes Genom 41, 507–514 (2019). https://doi.org/10.1007/s13258-019-00782-1

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