Tospoviruses are plant-infecting viruses belonging to the family Bunyaviridae. We used a collection of wild-type, phylogenetically distinct tomato spotted wilt virus isolates and related silencing-suppressor defective mutants to study the effects on the small RNA (sRNA) accumulation during infection of Nicotiana benthamiana. Our data showed that absence of a functional silencing suppressor determined a marked increase of the total amount of viral sRNAs (vsRNAs), and specifically of the 21 nt class. We observed a common under-representation of vsRNAs mapping to the intergenic region of S and M genomic segments, and preferential mapping of the reads against the viral sense open reading frames, with the exception of the NSs gene. The NSs-mutant strains showed enrichment of NSm-derived vsRNA compared to the expected amount based on gene size. Analysis of 5' terminal nucleotide preference evidenced a significant enrichment in U for the 21 nt- and in A for 24 nt- long endogenous sRNAs in all the samples. Hotspot analysis revealed a common abundant accumulation of reads at the 5' end of the L segment, mostly in the antiviral sense, for the NSs-defective isolates, suggesting that absence of the silencing suppressor can influence preferential targeting of the viral genome.
This research output has an Altmetric Attention Score of 2. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 08 June 2015.
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