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Modification of betanodavirus virulence by substitutions in the 3' terminal region of RNA2

Betanodaviruses have bi-segmented positive-sense RNA genomes, consisting of RNAs 1 and 2. For some members of the related genus alphanodavirus, the 3′ terminal 50 nucleotides (nt) of RNA2, including a predicted stem-loop structure (3′SL), are essential for replication. We investigate the possible ex...

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Autores principales: Souto, Sandra, Olveira, José G., Dopazo, Carlos P., Borrego, Juan J., Bandín, Isabel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Microbiology Society 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6230769/
https://www.ncbi.nlm.nih.gov/pubmed/30041710
http://dx.doi.org/10.1099/jgv.0.001112
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author Souto, Sandra
Olveira, José G.
Dopazo, Carlos P.
Borrego, Juan J.
Bandín, Isabel
author_facet Souto, Sandra
Olveira, José G.
Dopazo, Carlos P.
Borrego, Juan J.
Bandín, Isabel
author_sort Souto, Sandra
collection PubMed
description Betanodaviruses have bi-segmented positive-sense RNA genomes, consisting of RNAs 1 and 2. For some members of the related genus alphanodavirus, the 3′ terminal 50 nucleotides (nt) of RNA2, including a predicted stem-loop structure (3′SL), are essential for replication. We investigate the possible existence and role of a similar structure in a reassortant betanodavirus strain (RGNNV/SJNNV). In this study, we developed three recombinant strains containing nucleotide changes at positions 1408 and 1412. Predictive models showed stem-loop structures involving nt 1398–1421 of the natural reassortant whereas this structure is modified in the recombinant viruses harbouring point mutations r1408 and r1408–1412, but not in r1412. Results obtained from infectivity assays showed differences between the reference strains and the mutants in both RNA1 and RNA2 synthesis. Moreover, an imbalance between the synthesis of both segments was demonstrated, mainly with the double mutant. All these results suggest an interaction between RNA1 and the 3′ non-coding regions (3′NCR) of RNA2. In addition, the significant attenuation of the virulence for Senegalese sole and the delayed replication of r1408–1412 in brain tissues may point to an interaction of RNA2 with host cellular proteins.
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spelling pubmed-62307692018-11-13 Modification of betanodavirus virulence by substitutions in the 3' terminal region of RNA2 Souto, Sandra Olveira, José G. Dopazo, Carlos P. Borrego, Juan J. Bandín, Isabel J Gen Virol Research Article Betanodaviruses have bi-segmented positive-sense RNA genomes, consisting of RNAs 1 and 2. For some members of the related genus alphanodavirus, the 3′ terminal 50 nucleotides (nt) of RNA2, including a predicted stem-loop structure (3′SL), are essential for replication. We investigate the possible existence and role of a similar structure in a reassortant betanodavirus strain (RGNNV/SJNNV). In this study, we developed three recombinant strains containing nucleotide changes at positions 1408 and 1412. Predictive models showed stem-loop structures involving nt 1398–1421 of the natural reassortant whereas this structure is modified in the recombinant viruses harbouring point mutations r1408 and r1408–1412, but not in r1412. Results obtained from infectivity assays showed differences between the reference strains and the mutants in both RNA1 and RNA2 synthesis. Moreover, an imbalance between the synthesis of both segments was demonstrated, mainly with the double mutant. All these results suggest an interaction between RNA1 and the 3′ non-coding regions (3′NCR) of RNA2. In addition, the significant attenuation of the virulence for Senegalese sole and the delayed replication of r1408–1412 in brain tissues may point to an interaction of RNA2 with host cellular proteins. Microbiology Society 2018-09 2018-07-24 /pmc/articles/PMC6230769/ /pubmed/30041710 http://dx.doi.org/10.1099/jgv.0.001112 Text en © 2018 The Authors http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Souto, Sandra
Olveira, José G.
Dopazo, Carlos P.
Borrego, Juan J.
Bandín, Isabel
Modification of betanodavirus virulence by substitutions in the 3' terminal region of RNA2
title Modification of betanodavirus virulence by substitutions in the 3' terminal region of RNA2
title_full Modification of betanodavirus virulence by substitutions in the 3' terminal region of RNA2
title_fullStr Modification of betanodavirus virulence by substitutions in the 3' terminal region of RNA2
title_full_unstemmed Modification of betanodavirus virulence by substitutions in the 3' terminal region of RNA2
title_short Modification of betanodavirus virulence by substitutions in the 3' terminal region of RNA2
title_sort modification of betanodavirus virulence by substitutions in the 3' terminal region of rna2
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6230769/
https://www.ncbi.nlm.nih.gov/pubmed/30041710
http://dx.doi.org/10.1099/jgv.0.001112
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