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2014 ; 124
(13
): 2046-50
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A nonsense mutation in IKBKB causes combined immunodeficiency
#MMPMID25139357
Mousallem T
; Yang J
; Urban TJ
; Wang H
; Adeli M
; Parrott RE
; Roberts JL
; Goldstein DB
; Buckley RH
; Zhong XP
Blood
2014[Sep]; 124
(13
): 2046-50
PMID25139357
show ga
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
IKK? and severely decreased NEMO proteins. Mutant IKK?(R286X) was unable to
complex with IKK?/NEMO. Immortalized patient B cells displayed impaired I?B?
phosphorylation and NF?B nuclear translocation. These data indicate that mutated
IKBKB is the likely cause of immunodeficiency in these 4 patients.