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© Research
Publication : Science immunology

Severe type I interferonopathy and unrestrained interferon signaling due to a homozygous germline mutation in

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Science immunology - 13 Dec 2019

Duncan CJA, Thompson BJ, Chen R, Rice GI, Gothe F, Young DF, Lovell SC, Shuttleworth VG, Brocklebank V, Corner B, Skelton AJ, Bondet V, Coxhead J, Duffy D, Fourrage C, Livingston JH, Pavaine J, Cheesman E, Bitetti S, Grainger A, Acres M, Innes BA, Mikulasova A, Sun R, Hussain R, Wright R, Wynn R, Zarhrate M, Zeef LAH, Wood K, Hughes SM, Harris CL, Engelhardt KR, Crow YJ, Randall RE, Kavanagh D, Hambleton S, Briggs TA

Link to Pubmed [PMID] – 31836668

Sci Immunol 2019 Dec;4(42)

Excessive type I interferon (IFNα/β) activity is implicated in a spectrum of human disease, yet its direct role remains to be conclusively proven. We investigated two siblings with severe early-onset autoinflammatory disease and an elevated IFN signature. Whole-exome sequencing revealed a shared homozygous missense Arg148Trp variant in , a transcription factor that functions exclusively downstream of innate IFNs. Cells bearing STAT2 in homozygosity (but not heterozygosity) were hypersensitive to IFNα/β, which manifest as prolonged Janus kinase-signal transducers and activators of transcription (STAT) signaling and transcriptional activation. We show that this gain of IFN activity results from the failure of mutant STAT2 to interact with ubiquitin-specific protease 18, a key STAT2-dependent negative regulator of IFNα/β signaling. These observations reveal an essential in vivo function of STAT2 in the regulation of human IFNα/β signaling, providing concrete evidence of the serious pathological consequences of unrestrained IFNα/β activity and supporting efforts to target this pathway therapeutically in IFN-associated disease.

https://www.ncbi.nlm.nih.gov/pubmed/31836668