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<p>Using total RNA sequencing, we detected a novel RNA virus infecting a Finnish isolate of the fungal conifer pathogen <i>Diplodia sapinea</i>, and its genome sequence was verified by Sanger sequencing. This virus, which we have named "Diplodia sapinea flexi-like virus 1" (DsFLV1), has a 7,494-nucleotide-long positive-sense single-stranded RNA genome, excluding the poly(A) tail. The largest open reading frame (ORF1) encodes a replication-associated polyprotein (RP) that contains conserved domains characteristic of members of the order <i>Tymovirales</i>, including viral methyltransferase (Mtr), viral helicase (Hel), and RNA-dependent RNA polymerase (RdRP) domains. Four smaller ORFs were also identified. ORF2 potentially encodes a capsid protein, while the other three ORFs, initiated by alternative start codons, encode putative proteins with unknown functions. Phylogenetic analysis placed DsFLV1 in a distinct clade within the family <i>Deltaflexiviridae</i>, close to Erysiphe necator-associated flexivirus 2. This is the first report of a positive-sense single-stranded RNA virus infecting <i>D. sapinea</i>.</p>

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Complete genome sequence and characterisation of a novel flexivirus infecting the necrotrophic conifer pathogen Diplodia sapinea

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月16日

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  • Suvi Sutela,
  • Miloš Trifković,
  • Eeva Terhonen

摘要

Using total RNA sequencing, we detected a novel RNA virus infecting a Finnish isolate of the fungal conifer pathogen Diplodia sapinea, and its genome sequence was verified by Sanger sequencing. This virus, which we have named "Diplodia sapinea flexi-like virus 1" (DsFLV1), has a 7,494-nucleotide-long positive-sense single-stranded RNA genome, excluding the poly(A) tail. The largest open reading frame (ORF1) encodes a replication-associated polyprotein (RP) that contains conserved domains characteristic of members of the order Tymovirales, including viral methyltransferase (Mtr), viral helicase (Hel), and RNA-dependent RNA polymerase (RdRP) domains. Four smaller ORFs were also identified. ORF2 potentially encodes a capsid protein, while the other three ORFs, initiated by alternative start codons, encode putative proteins with unknown functions. Phylogenetic analysis placed DsFLV1 in a distinct clade within the family Deltaflexiviridae, close to Erysiphe necator-associated flexivirus 2. This is the first report of a positive-sense single-stranded RNA virus infecting D. sapinea.