Abstract
Type I IFNs, a family of cytokines that signal through a single receptor and signaling mechanism, were originally named for their ability to interfere with viral replication. While type II IFN (IFN-γ) largely protects against intracellular bacteria and protozoa, type I IFNs largely protect from viral infections. Inborn errors of immunity in humans have demonstrated this point and its clinical relevance with increasing clarity. In this issue of the JCI, Bucciol, Moens, et al. report the largest series of patients to date with deficiency of STAT2, an important protein for type I IFN signaling. Individuals with STAT2 loss demonstrated a clinical phenotype of viral susceptibility and inflammatory complications, many of which remain poorly understood. These findings further illustrate the very specific and critical role that type I IFNs play in host defense against viruses.
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