Repository of Research and Investigative Information

Repository of Research and Investigative Information

دانشگاه علوم پزشکی و خدمات بهداشتی درمانی زنجان

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

(2017) Functional Evaluation of an IKBKG Variant Suspected to Cause Immunodeficiency Without Ectodermal Dysplasia. Journal of Clinical Immunology. pp. 801-810. ISSN 0271-9142

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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-1 beta, Pam(3)CSK(4,) and FSL-1. In patient fibroblasts, I kappa B-alpha was degraded normally upon stimulation with IL-1 beta or TNF-alpha. 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-1 beta and TNF-alpha. 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.

Item Type: Article
Keywords: Immunodeficiency NF-kappa B essential modulator NEMO toll-like receptors NF-kappa B pathway B ESSENTIAL MODULATOR TOLL-LIKE RECEPTOR INCONTINENTIA PIGMENTI SIGNALING PATHWAY HUMAN-DISEASE MUTATION NEMO ACTIVATION DOMAIN IDENTIFICATION Immunology
Page Range: pp. 801-810
Journal or Publication Title: Journal of Clinical Immunology
Abstract and Indexing: ISI, Pubmed, Scopus
Quartile : Q2
Volume: 37
Number: 8
Identification Number: https://doi.org/10.1007/s10875-017-0448-9 <Go to ISI>://WOS:000414207800010
ISSN: 0271-9142
Depositing User: خانم مریم زرقانی
URI: http://repository.zums.ac.ir/id/eprint/76

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