Impaired IL-23-dependent induction of IFN-γ underlies mycobacterial disease in patients with inherited TYK2 deficiency
Details
Publication Year 2022-10-03,Volume 219,Issue #10,Page e20220094
Journal Title
Journal of Experimental Medicine
Abstract
Human cells homozygous for rare loss-of-expression (LOE) TYK2 alleles have impaired, but not abolished, cellular responses to IFN-α/β (underlying viral diseases in the patients) and to IL-12 and IL-23 (underlying mycobacterial diseases). Cells homozygous for the common P1104A TYK2 allele have selectively impaired responses to IL-23 (underlying isolated mycobacterial disease). We report three new forms of TYK2 deficiency in six patients from five families homozygous for rare TYK2 alleles (R864C, G996R, G634E, or G1010D) or compound heterozygous for P1104A and a rare allele (A928V). All these missense alleles encode detectable proteins. The R864C and G1010D alleles are hypomorphic and loss-of-function (LOF), respectively, across signaling pathways. By contrast, hypomorphic G996R, G634E, and A928V mutations selectively impair responses to IL-23, like P1104A. Impairment of the IL-23-dependent induction of IFN-γ is the only mechanism of mycobacterial disease common to patients with complete TYK2 deficiency with or without TYK2 expression, partial TYK2 deficiency across signaling pathways, or rare or common partial TYK2 deficiency specific for IL-23 signaling.
Publisher
Rockefeller University Press
Keywords
Humans; Interferon-gamma/metabolism; Interleukin-23; Job Syndrome/genetics; TYK2 Kinase/deficiency/genetics/metabolism
Research Division(s)
Inflammation
PubMed ID
36094518
Open Access at Publisher's Site
https://doi.org/10.1084/jem.20220094
Terms of Use/Rights Notice
Refer to copyright notice on published article.


Creation Date: 2023-02-02 02:06:35
Last Modified: 2023-02-17 11:17:01
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