A nonsense mutation in IKBKB causes combined immunodeficiency.

Published

Journal Article

Identification of the molecular etiologies of primary immunodeficiencies has led to important insights into the development and function of the immune system. We report here the cause of combined immunodeficiency in 4 patients from 2 different consanguineous Qatari families with similar clinical and immunologic phenotypes. The patients presented at an early age with fungal, viral, and bacterial infections and hypogammaglobulinemia. Although their B- and T-cell numbers were normal, they had low regulatory T-cell and NK-cell numbers. Moreover, patients' T cells were mostly CD45RA(+)-naive cells and were defective in activation after T-cell receptor stimulation. All patients contained the same homozygous nonsense mutation in IKBKB (R286X), revealed by whole-exome sequencing with undetectable IKKβ and severely decreased NEMO proteins. Mutant IKKβ(R286X) was unable to complex with IKKα/NEMO. Immortalized patient B cells displayed impaired IκBα phosphorylation and NFκB nuclear translocation. These data indicate that mutated IKBKB is the likely cause of immunodeficiency in these 4 patients.

Full Text

Duke Authors

Cited Authors

  • Mousallem, T; Yang, J; Urban, TJ; Wang, H; Adeli, M; Parrott, RE; Roberts, JL; Goldstein, DB; Buckley, RH; Zhong, X-P

Published Date

  • September 25, 2014

Published In

Volume / Issue

  • 124 / 13

Start / End Page

  • 2046 - 2050

PubMed ID

  • 25139357

Pubmed Central ID

  • 25139357

Electronic International Standard Serial Number (EISSN)

  • 1528-0020

Digital Object Identifier (DOI)

  • 10.1182/blood-2014-04-571265

Language

  • eng

Conference Location

  • United States