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Avian interferon regulatory factor (IRF) family reunion: IRF3 and IRF9 found

. 2025 Jul 01 ; 23 (1) : 180. [epub] 20250701

Language English Country Great Britain, England Media electronic

Document type Journal Article

Grant support
GA23-07210S Grantová Agentura České Republiky
GA23-07210S Grantová Agentura České Republiky
GA23-07210S Grantová Agentura České Republiky
GA23-07210S Grantová Agentura České Republiky
FOR5130 Deutsche Forschungsgemeinschaft
FOR5130 Deutsche Forschungsgemeinschaft

Links

PubMed 40597257
PubMed Central PMC12220609
DOI 10.1186/s12915-025-02261-4
PII: 10.1186/s12915-025-02261-4
Knihovny.cz E-resources

BACKGROUND: Interferon regulatory factors (IRFs) are a family of transcription factors with important functions in immunity. The genomes of most vertebrates encode ten IRF genes. IRF3 and IRF9 have key roles in interferon (IFN) induction and signaling. Most of our knowledge about the IFN pathways originates from the study of the mammalian IFN system, and the description of the corresponding avian components is not as complete. Both IRF3 and IRF9 were considered missing from the chicken genome and from the genomes of other avian species. RESULTS: Here we describe multiple avian IRF3 and IRF9 genes, all with difficult GC-rich sequence context that prevented their earlier characterization. IRF3 orthologs are narrowly distributed and are present in the avian infraclass Palaeognathae. In contrast, IRF9 orthologs were found in most avian species, with the exception of the order Galliformes. In about half of the avian orders, IRF9 was located in noncanonical chromosomal positions, indicating past translocations. Phylogenetic analysis confirmed the correct orthology of all newly described IRFs. We further performed experiments using duck IRF9, confirming its role in the IFN pathway. IRF9 knockout in duck fibroblasts decreases the induction of IFN-stimulated genes (ISGs). Full induction of ISGs in duck cells requires both an intact IRF9 and a canonical IFN-stimulated response element. Lastly, intact IRF9 is needed for IFN-mediated protection of duck cells against the vesicular stomatitis virus-induced cytopathicity. CONCLUSIONS: The identification of avian IRFs fills an important gap in our understanding of avian immunology and brings new questions related to the evolution of the IRF family.

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