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<p>A novel virus belonging to the genus <i>Victorivirus</i> was identified in the plant-pathogenic fungus <i>Colletotrichum gloeosporioides</i>. Its genome is a double-stranded RNA molecule of 5217 bp containing two open reading frames (ORFs). The 5′-proximal ORF (ORF1) encodes a coat protein (CP) consisting of 734 amino acids (aa), whereas the 3′-proximal ORF (ORF2) encodes an RNA-dependent RNA polymerase (RdRp) of 875 aa. The two ORFs overlap at the tetranucleotide sequence AUGA, facilitating a coupled termination–initiation mechanism, which is characteristic of members of the genus <i>Victorivirus</i>. The amino acid sequences of RdRp and CP were found to be most similar (42% and 34% identical, respectively) to those of the Ustilaginoidea virens RNA virus 1. Phylogenetic analysis based on RdRp and CP sequences further supported the placement of this virus within the genus <i>Victorivirus</i>. The genome of this victorivirus, for which we propose the name “Colletotrichum gloeosporioides victorivirus 1” (CgVV1), is 5.2 kb in length and was one of several dsRNA segments identified in the fungal isolate, indicating coinfection with other mycoviruses. To the best of our knowledge, this is the first report of a victorivirus infecting <i>C</i>. <i>gloeosporioides.</i></p>

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Complete genome sequence of a novel victorivirus from Colletotrichum gloeosporioides

  • 期刊论文

  • 发表日期：

    2026年1月10日

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  • Megha Das,
  • A. I. Bhat

摘要

A novel virus belonging to the genus Victorivirus was identified in the plant-pathogenic fungus Colletotrichum gloeosporioides. Its genome is a double-stranded RNA molecule of 5217 bp containing two open reading frames (ORFs). The 5′-proximal ORF (ORF1) encodes a coat protein (CP) consisting of 734 amino acids (aa), whereas the 3′-proximal ORF (ORF2) encodes an RNA-dependent RNA polymerase (RdRp) of 875 aa. The two ORFs overlap at the tetranucleotide sequence AUGA, facilitating a coupled termination–initiation mechanism, which is characteristic of members of the genus Victorivirus. The amino acid sequences of RdRp and CP were found to be most similar (42% and 34% identical, respectively) to those of the Ustilaginoidea virens RNA virus 1. Phylogenetic analysis based on RdRp and CP sequences further supported the placement of this virus within the genus Victorivirus. The genome of this victorivirus, for which we propose the name “Colletotrichum gloeosporioides victorivirus 1” (CgVV1), is 5.2 kb in length and was one of several dsRNA segments identified in the fungal isolate, indicating coinfection with other mycoviruses. To the best of our knowledge, this is the first report of a victorivirus infecting C. gloeosporioides.