A homozygous loss-of-function mutation leading to CYBC1 deficiency causes chronic granulomatous disease

Mutations in genes encoding subunits of the phagocyte NADPH oxidase complex are recognized to cause chronic granulomatous disease (CGD), a severe primary immunodeficiency. Here we describe how deficiency of CYBC1, a previously uncharacterized protein in humans (C17orf62), leads to reduced expression...

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Published in:Nature Communications
Main Authors: Arnadottir, Gudny A., Norddahl, Gudmundur L., Gudmundsdottir, Steinunn, Agustsdottir, Arna B., Sigurdsson, Snaevar, Jensson, Brynjar O., Bjarnadottir, Kristbjorg, Theodors, Fannar, Benonisdottir, Stefania, Ivarsdottir, Erna V., Oddsson, Asmundur, Kristjansson, Ragnar P., Sulem, Gerald, Alexandersson, Kristjan F., Juliusdottir, Thorhildur, Gudmundsson, Kjartan R., Saemundsdottir, Jona, Jonasdottir, Adalbjorg, Jonasdottir, Aslaug, Sigurdsson, Asgeir, Manzanillo, Paolo, Gudjonsson, Sigurjon A., Thorisson, Gudmundur A., Magnusson, Olafur Th., Masson, Gisli, Orvar, Kjartan B., Holm, Hilma, Bjornsson, Sigurdur, Arngrimsson, Reynir, Gudbjartsson, Daniel F., Thorsteinsdottir, Unnur, Jonsdottir, Ingileif, Haraldsson, Asgeir, Sulem, Patrick, Stefansson, Kari
Format: Text
Language:English
Published: Nature Publishing Group UK 2018
Subjects:
Article
Two Brothers
Iceland
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6202333/
http://www.ncbi.nlm.nih.gov/pubmed/30361506
https://doi.org/10.1038/s41467-018-06964-x
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Summary:Mutations in genes encoding subunits of the phagocyte NADPH oxidase complex are recognized to cause chronic granulomatous disease (CGD), a severe primary immunodeficiency. Here we describe how deficiency of CYBC1, a previously uncharacterized protein in humans (C17orf62), leads to reduced expression of NADPH oxidase’s main subunit (gp91phox) and results in CGD. Analyzing two brothers diagnosed with CGD we identify a homozygous loss-of-function mutation, p.Tyr2Ter, in CYBC1. Imputation of p.Tyr2Ter into 155K chip-genotyped Icelanders reveals six additional homozygotes, all with signs of CGD, manifesting as colitis, rare infections, or a severely impaired PMA-induced neutrophil oxidative burst. Homozygosity for p.Tyr2Ter consequently associates with inflammatory bowel disease (IBD) in Iceland (P = 8.3 × 10−8; OR = 67.6), as well as reduced height (P = 3.3 × 10−4; −8.5 cm). Overall, we find that CYBC1 deficiency results in CGD characterized by colitis and a distinct profile of infections indicative of macrophage dysfunction.

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