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Functional Evaluation of an IKBKG Variant Suspected to Cause Immunodeficiency Without Ectodermal Dysplasia.

Authors
  • Frans, Glynis1
  • van der Werff Ten Bosch, Jutte2
  • Moens, Leen1
  • Gijsbers, Rik3, 4
  • Changi-Ashtiani, Majid5
  • Rokni-Zadeh, Hassan6
  • Shahrooei, Mohammad7, 8
  • Wuyts, Greet1
  • Meyts, Isabelle9, 10
  • Bossuyt, Xavier11, 12
  • 1 Department of Microbiology and Immunology, Experimental Laboratory Immunology, KU Leuven, Leuven, Belgium. , (Belgium)
  • 2 Department of Pediatric Hematology, Oncology and Immunology, University Hospital Brussels, Brussels, Belgium. , (Belgium)
  • 3 Leuven Viral Vector Core, KU Leuven, Leuven, Belgium. , (Belgium)
  • 4 Department of Pharmaceutical and Pharmacological Sciences, Laboratory for Viral Vector Technology & Gene Therapy, KU Leuven, Leuven, Belgium. , (Belgium)
  • 5 School of Mathematics, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran. , (Iran)
  • 6 Department of Medical Biotechnology and Nanotechnology, Zanjan University of Medical Sciences, Zanjan, Iran. , (Iran)
  • 7 Department of Microbiology and Immunology, Laboratory of Clinical Bacteriology and Mycology, KU Leuven, Leuven, Belgium. , (Belgium)
  • 8 Specialized Immunology Laboratory of Dr. Shahrooei, Ahvaz, Iran. , (Iran)
  • 9 Department of Pediatrics, University Hospitals Leuven, Leuven, Belgium. , (Belgium)
  • 10 Department of Microbiology and Immunology, Childhood Immunology, KU Leuven, Leuven, Belgium. , (Belgium)
  • 11 Department of Microbiology and Immunology, Experimental Laboratory Immunology, KU Leuven, Leuven, Belgium. [email protected] , (Belgium)
  • 12 Department of Laboratory Medicine, University Hospitals Leuven, U.Z. Gasthuisberg, Herestraat 49, 3000, Leuven, Belgium. [email protected] , (Belgium)
Type
Published Article
Journal
Journal of Clinical Immunology
Publisher
Springer-Verlag
Publication Date
Nov 01, 2017
Volume
37
Issue
8
Pages
801–810
Identifiers
DOI: 10.1007/s10875-017-0448-9
PMID: 28993958
Source
Medline
Keywords
License
Unknown

Abstract

Hypomorphic IKBKG mutations in males are typically associated with anhidrotic ectodermal dysplasia with immunodeficiency (EDA-ID). Some mutations cause immunodeficiency without EDA (NEMO-ID). The immunological profile associated with these NEMO-ID variants is not fully documented. We present a 2-year-old patient with suspected immunodeficiency in which a hemizygous p.Glu57Lys IKBKG variant was identified. At the age of 1 year, he had an episode of otitis media that evolved into a bilateral mastoiditis (Pseudomonas spp). Hypogammaglobulinemia, specific (polysaccharide) antibody deficiency, and low switched memory B cell subsets were noticed. The mother was heterozygous for the variant but had no signs of incontinentia pigmenti. Patient peripheral blood mononuclear cells produced low amounts of IL-6 after stimulation with IL-1β, Pam3CSK4, and FSL-1. In patient fibroblasts, IκB-α was degraded normally upon stimulation with IL-1β or TNF-α. Transduction of wild-type and variant NEMO in NEMO-/- deficient SV40 fibroblasts revealed a slight but significant reduction of IL-6 production upon stimulation with IL-1β and TNF-α. In conclusion, we demonstrated that p.Glu57Lys leads to specific immunological defects in vitro. No other pathogenic PID variants were identified through whole exome sequencing. As rare polymorphisms have been described in IKBKG and polygenic inheritance remains an option in the presented case, this study emphasizes the need for thorough functional and genetic evaluation when encountering and interpreting suspected disease-causing NEMO-ID variants.

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