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Gain-of-function Human STAT1 Mutations Impair IL-17 Immunity and Underlie Chronic Mucocutaneous Candidiasis

Gain-of-function Human STAT1 Mutations Impair IL-17 Immunity and Underlie Chronic Mucocutaneous Candidiasis

Luyan Liu, Satoshi Okada, Xiao-Fei Kong, Alexandra Y Kreins, Sophie Cypowyj, Avinash Abhyankar, Julie Toubiana, Yuval Itan, Magali Audry, Patrick Nitschke, Cécile Masson, Beata Toth, Jérome Flatot, Mélanie Migaud, etc.

J Exp Med. 2011 Aug 1;208(8):1635-48.

PMID: 21727188

Abstract:

Chronic mucocutaneous candidiasis disease (CMCD) may be caused by autosomal dominant (AD) IL-17F deficiency or autosomal recessive (AR) IL-17RA deficiency. Here, using whole-exome sequencing, we identified heterozygous germline mutations in STAT1 in 47 patients from 20 kindreds with AD CMCD. Previously described heterozygous STAT1 mutant alleles are loss-of-function and cause AD predisposition to mycobacterial disease caused by impaired STAT1-dependent cellular responses to IFN-γ. Other loss-of-function STAT1 alleles cause AR predisposition to intracellular bacterial and viral diseases, caused by impaired STAT1-dependent responses to IFN-α/β, IFN-γ, IFN-λ, and IL-27. In contrast, the 12 AD CMCD-inducing STAT1 mutant alleles described here are gain-of-function and increase STAT1-dependent cellular responses to these cytokines, and to cytokines that predominantly activate STAT3, such as IL-6 and IL-21. All of these mutations affect the coiled-coil domain and impair the nuclear dephosphorylation of activated STAT1, accounting for their gain-of-function and dominance. Stronger cellular responses to the STAT1-dependent IL-17 inhibitors IFN-α/β, IFN-γ, and IL-27, and stronger STAT1 activation in response to the STAT3-dependent IL-17 inducers IL-6 and IL-21, hinder the development of T cells producing IL-17A, IL-17F, and IL-22. Gain-of-function STAT1 alleles therefore cause AD CMCD by impairing IL-17 immunity.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR42415000	STAT1 human			Price

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