Incontinentia pigmenti underlies thymic dysplasia, autoantibodies to type I IFNs, and viral diseases

J Exp Med. 2024 Nov 4;221(11):e20231152. doi: 10.1084/jem.20231152. Epub 2024 Oct 1.

Abstract

Human inborn errors of thymic T cell tolerance underlie the production of autoantibodies (auto-Abs) neutralizing type I IFNs, which predispose to severe viral diseases. We analyze 131 female patients with X-linked dominant incontinentia pigmenti (IP), heterozygous for loss-of-function (LOF) NEMO variants, from 99 kindreds in 10 countries. Forty-seven of these patients (36%) have auto-Abs neutralizing IFN-α and/or IFN-ω, a proportion 23 times higher than that for age-matched female controls. This proportion remains stable from the age of 6 years onward. On imaging, female patients with IP have a small, abnormally structured thymus. Auto-Abs against type I IFNs confer a predisposition to life-threatening viral diseases. By contrast, patients with IP lacking auto-Abs against type I IFNs are at no particular risk of viral disease. These results suggest that IP accelerates thymic involution, thereby underlying the production of auto-Abs neutralizing type I IFNs in at least a third of female patients with IP, predisposing them to life-threatening viral diseases.

MeSH terms

  • Adolescent
  • Adult
  • Autoantibodies* / immunology
  • Child
  • Child, Preschool
  • Female
  • Humans
  • I-kappa B Kinase* / genetics
  • I-kappa B Kinase* / immunology
  • Incontinentia Pigmenti* / genetics
  • Incontinentia Pigmenti* / immunology
  • Incontinentia Pigmenti* / pathology
  • Infant
  • Interferon Type I* / immunology
  • Interferon Type I* / metabolism
  • Thymus Gland* / immunology
  • Thymus Gland* / pathology
  • Virus Diseases / immunology
  • Young Adult

Substances

  • Interferon Type I
  • Autoantibodies
  • I-kappa B Kinase
  • IKBKG protein, human