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© Research
Publication : Journal of immunology (Baltimore, Md. : 1950)

IFN-Stimulated Genes in Zebrafish and Humans Define an Ancient Arsenal of Antiviral Immunity.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of immunology (Baltimore, Md. : 1950) - 15 Nov 2019

Levraud JP, Jouneau L, Briolat V, Laghi V, Boudinot P,

Link to Pubmed [PMID] – 31732531

Link to DOI [DOI] – 10.4049/jimmunol.1900804

J. Immunol. 2019 12; 203(12): 3361-3373

The evolution of the IFN system, the major innate antiviral mechanism of vertebrates, remains poorly understood. According to the detection of type I IFN genes in cartilaginous fish genomes, the system appeared 500 My ago. However, the IFN system integrates many other components, most of which are encoded by IFN-stimulated genes (ISGs). To shed light on its evolution, we have used deep RNA sequencing to generate a comprehensive list of ISGs of zebrafish, taking advantage of the high-quality genome annotation in this species. We analyzed larvae after inoculation of recombinant zebrafish type I IFN, or infection with chikungunya virus, a potent IFN inducer. We identified more than 400 zebrafish ISGs, defined as being either directly induced by IFN or induced by the virus in an IFNR-dependent manner. Their human orthologs were highly enriched in ISGs, particularly for highly inducible genes. We identified 72 orthology groups containing ISGs in both zebrafish and humans, revealing a core ancestral ISG repertoire that includes most of the known signaling components of the IFN system. Many downstream effectors were also already present 450 My ago in the common ancestor of tetrapods and bony fish and diversified as multigene families independently in the two lineages. A large proportion of the ISG repertoire is lineage specific; around 40% of protein-coding zebrafish ISGs had no human ortholog. We identified 14 fish-specific gene families containing multiple ISGs, including finTRIMs. This work illuminates the evolution of the IFN system and provides a rich resource to explore new antiviral mechanisms.

https://pubmed.ncbi.nlm.nih.gov/31732531