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Complex transcriptional regulations of a hyperparasitic quadripartite system in giant viruses infecting protists

Author

Listed:
  • Alexandra Bessenay

    (IOM)

  • Hugo Bisio

    (IOM)

  • Lucid Belmudes

    (FR2048)

  • Yohann Couté

    (FR2048)

  • Lionel Bertaux

    (IOM
    IM2B)

  • Jean-Michel Claverie

    (IOM)

  • Chantal Abergel

    (IOM)

  • Sandra Jeudy

    (IOM)

  • Matthieu Legendre

    (IOM)

Abstract

Hyperparasitism is a common pattern in nature that is not limited to cellular organisms. Giant viruses infecting protists can be hyperparasitized by smaller ones named virophages. In addition, both may carry episomal DNA molecules known as transpovirons in their particles. They all share transcriptional regulatory elements that dictate the expression of their genes within viral factories built by giant viruses in the host cytoplasm. This suggests the existence of interactions between their respective transcriptional networks. Here we investigated Acanthamoeba castellanii cells infected by a giant virus (megavirus chilensis), and coinfected with a virophage (zamilon vitis) and/or a transpoviron (megavirus vitis transpoviron). Infectious cycles were monitored through time-course RNA sequencing to decipher the transcriptional program of each partner and its impact on the gene expression of the others. We found highly diverse transcriptional responses. While the giant virus drastically reshaped the host cell transcriptome, the transpoviron had no effect on the gene expression of any of the players. In contrast, the virophage strongly modified the giant virus gene expression, albeit transiently, without altering the protein composition of mature viral particles. The virophage also induced the overexpression of transpoviron genes, likely through the indirect upregulation of giant virus-encoded transcription factors. Together, these analyses document the intricated transcriptionally regulated networks taking place in the infected cell.

Suggested Citation

  • Alexandra Bessenay & Hugo Bisio & Lucid Belmudes & Yohann Couté & Lionel Bertaux & Jean-Michel Claverie & Chantal Abergel & Sandra Jeudy & Matthieu Legendre, 2024. "Complex transcriptional regulations of a hyperparasitic quadripartite system in giant viruses infecting protists," Nature Communications, Nature, vol. 15(1), pages 1-15, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52906-1
    DOI: 10.1038/s41467-024-52906-1
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    References listed on IDEAS

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