Journal
TRENDS IN IMMUNOLOGY
Volume 38, Issue 2, Pages 79-93Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.it.2016.11.001
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Funding
- NIAID NIH HHS [R01 AI127372] Funding Source: Medline
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ISG15 is a type I interferon (IFN)-inducible gene encoding a protein with pleiotropic functions, acting both as a soluble molecule and as a protein modifier. Surprisingly, and despite the antiviral functions of ISG15 described in mice, humans born with inactivating mutations of ISG15 do not present with any overt viral phenotype, but are highly susceptible to environmental mycobacteria and have autoinflammatory disease presentations. In vitro, ISG15 deficiency also leads to persistently high levels of type I IFN-stimulated gene expression and to increased resistance to all viruses tested to date. This suggests that ISG15 deficiency increases antiviral responses in humans, in stark contrast to expectations based on mouse experiments. We discuss here the roles of each of the forms of ISG15 in health and disease, as well as the differences between species.
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