Assessing the Functional Relevance of Variants in the () in a Cohort of Patients With Primary Immunodeficiency.

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ID: 32039
2019
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Ranked #53 of 111 articles by views in Frontiers in immunology

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Abstract
Common variable immunodeficiency (CVID) is the most frequent symptomatic primary immunodeficiency. Patients with CVID are prone to recurrent bacterial infection due to the failure of adequate immunoglobulin production. Monogenetic defects have been identified in ~25% of CVID patients. Recently, mutations in , encoding the zinc-finger transcription factor IKAROS which is broadly expressed in hematopoietic cells, have been associated with a CVID-like phenotype. Herein we describe 11 patients with heterozygous variants from eight different families with autosomal dominant CVID and two siblings with an variant presenting with inflammatory bowel disease (IBD). This study shows that mutations affecting the DNA binding domain of IKAROS can impair the interaction with the target DNA sequence thereby preventing heterochromatin and pericentromeric localization (HC-PC) of the protein. Our results also indicate an impairment of pericentromeric localization of IKAROS by overexpression of a truncated variant, caused by an immature stop codon in . We also describe an additional variant in , encoding Tumor Necrosis Factor Related Apoptosis Inducing Ligand (TRAIL), additionally presented in individuals of Family A. Our results indicate that this variant may impair the TRAIL-induced apoptosis in target cell lines and prohibit the NFκB activation by TRAIL and may act as a modifier in Family A.
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Authors Eskandarian, Zoya;Fliegauf, Manfred;Bulashevska, Alla;Proietti, Michele;Hague, Rosie;Smulski, Cristian Roberto;Schubert, Desirée;Warnatz, Klaus;Grimbacher, Bodo;
Journal Frontiers in immunology
Year 2019
DOI
10.3389/fimmu.2019.00568
URL
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