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Abstract

Microviruses are single-stranded DNA bacteriophages and members of the highly diverse viral family . Microviruses have a seemingly ubiquitous presence across animal gut microbiomes and other global environmental ecosystems. Most of the studies on microvirus diversity so far have been associated with vertebrate gut viromes. In this study, we investigate the less explored invertebrate microviruses in a freshwater ecosystem. We analysed microviruses from invertebrates in the Chironomidae, Gastropoda, Odonata, Sphaeriidae, Unionidae clades, as well as from water and benthic sediment sampled from a lake ecosystem in New Zealand. Using gene-sharing networks and an expanded framework of informal and proposed microvirus subfamilies, the 463 distinct microvirus genomes identified in this study were grouped as follows: 382 genomes in the subfamily and 47 in the Pichovirinae subfamily clade, 18 belonging to Group D, 3 belonging to the proposed Alpavirinae subfamily clade, 1 belonging to the proposed Occultatumvirinae/Tainavirinae subfamilies clade and 12 belonging to an undefined viral cluster VC 1. Inverse associations of microviruses were noted between environmental benthic sediment samples and the Odonata group, while ‘defended’ invertebrates in the Gastropoda, Sphaeriidae and Unionidae groups showed correlative associations in the principal coordinate analysis of unique microvirus genomes (each genome sharing <98% genome-wide pairwise identity with each other) across sample types. This study expands the known diversity of microviruses and highlights the diversity of these relatively poorly classified bacteriophages.

Funding
This study was supported by the:
  • Brian Mason Scientific and Technical Trust (New Zealand)
    • Principle Award Recipient: AnishaDayaram
  • Brian Mason Scientific and Technical Trust (New Zealand)
    • Principle Award Recipient: JonS Harding
  • Brian Mason Scientific and Technical Trust (New Zealand)
    • Principle Award Recipient: ArvindVarsani
  • Brian Mason Scientific and Technical Trust (New Zealand)
    • Principle Award Recipient: MarkL. Galatowitsch
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/content/journal/jgv/10.1099/jgv.0.002049
2024-11-20
2024-12-02
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