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• W2953547120 abstract "In the absence of protein-coding ability, viroid RNAs rely on direct interactions with host factors for their infectivity. RNA structural elements are likely involved in these interactions. Therefore, preservation of a structural element, despite the sequence variability existing between the variants of a viroid population, is considered a solid evidence of its relevant role in vivo. In this study, apple hammerhead viroid (AHVd) was first identified in the two apple cultivars ‘Mela Rosa Guadagno’ (MRG) and ‘Agostinella’ (AG), which are cultivated since long in Southern Italy, thus providing the first solid evidence of its presence in this country. Then, the natural variability of AHVd viroid populations infecting MRG and AG was studied. The sequence variants from the two Italian isolates shared only 82.1–87.7% sequence identity with those reported previously from other geographic areas, thus providing the possibility of exploring the impact of this sequence divergence on the proposed secondary structure. Interestingly, all the AHVd sequence variants considered in this study preserved a branched secondary structure stabilized by a kissing-loop interaction, resembling the conformation proposed previously for variants from other isolates. Indeed, most mutations did not modify the proposed conformation because they were co-variations, conversions of canonical into wobble base-pairs, or vice versa, as well as changes mapping at loops. Importantly, a cruciform structural element formed by four hairpins, one of which is implicated in the proposed kissing-loop interaction, was also preserved because several nucleotide changes actually resulted into two, three and up to five consecutive co-variations associated with other changes that did not affect the secondary structure. These data provide very strong evidence for the relevance in vivo of this cruciform structure which, together with kissing-loop interaction, likely contribute to further stabilizing the branched AHVd secondary structure." @default.
• W2953547120 created "2019-07-12" @default.
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• W2953547120 date "2019-09-01" @default.
• W2953547120 modified "2023-10-10" @default.
• W2953547120 title "Molecular variability of apple hammerhead viroid from Italian apple varieties supports the relevance in vivo of its branched conformation stabilized by a kissing loop interaction" @default.
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• W2953547120 doi "https://doi.org/10.1016/j.virusres.2019.197644" @default.
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