Endogenous viral elements reveal associations between a non-retroviral RNA virus and symbiotic dinoflagellate genomes

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2023
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Veglia, Alex J.
Bistolas, Kalia S. I.
Ruscheweyh, Hans-Joachim
Planes, Serge
Allemand, Denis
Boissin, Emilie
Wincker, Patrick
Poulain, Julie
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Communications Biology. Springer. 2023, 6, 566. eISSN 2399-3642. Available under: doi: 10.1038/s42003-023-04917-9
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Endogenous viral elements (EVEs) offer insight into the evolutionary histories and hosts of contemporary viruses. This study leveraged DNA metagenomics and genomics to detect and infer the host of a non-retroviral dinoflagellate-infecting +ssRNA virus (dinoRNAV) common in coral reefs. As part of the Tara Pacific Expedition, this study surveyed 269 newly sequenced cnidarians and their resident symbiotic dinoflagellates (Symbiodiniaceae), associated metabarcodes, and publicly available metagenomes, revealing 178 dinoRNAV EVEs, predominantly among hydrocoral-dinoflagellate metagenomes. Putative associations between Symbiodiniaceae and dinoRNAV EVEs were corroborated by the characterization of dinoRNAV-like sequences in 17 of 18 scaffold-scale and one chromosome-scale dinoflagellate genome assembly, flanked by characteristically cellular sequences and in proximity to retroelements, suggesting potential mechanisms of integration. EVEs were not detected in dinoflagellate-free (aposymbiotic) cnidarian genome assemblies, including stony corals, hydrocorals, jellyfish, or seawater. The pervasive nature of dinoRNAV EVEs within dinoflagellate genomes (especially Symbiodinium), as well as their inconsistent within-genome distribution and fragmented nature, suggest ancestral or recurrent integration of this virus with variable conservation. Broadly, these findings illustrate how +ssRNA viruses may obscure their genomes as members of nested symbioses, with implications for host evolution, exaptation, and immunity in the context of reef health and disease.

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ISO 690VEGLIA, Alex J., Kalia S. I. BISTOLAS, Christian R. VOOLSTRA, Benjamin C. C. HUME, Hans-Joachim RUSCHEWEYH, Serge PLANES, Denis ALLEMAND, Emilie BOISSIN, Patrick WINCKER, Julie POULAIN, 2023. Endogenous viral elements reveal associations between a non-retroviral RNA virus and symbiotic dinoflagellate genomes. In: Communications Biology. Springer. 2023, 6, 566. eISSN 2399-3642. Available under: doi: 10.1038/s42003-023-04917-9
BibTex
@article{Veglia2023Endog-67453,
  year={2023},
  doi={10.1038/s42003-023-04917-9},
  title={Endogenous viral elements reveal associations between a non-retroviral RNA virus and symbiotic dinoflagellate genomes},
  volume={6},
  journal={Communications Biology},
  author={Veglia, Alex J. and Bistolas, Kalia S. I. and Voolstra, Christian R. and Hume, Benjamin C. C. and Ruscheweyh, Hans-Joachim and Planes, Serge and Allemand, Denis and Boissin, Emilie and Wincker, Patrick and Poulain, Julie},
  note={Article Number: 566}
}
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