Clinical, functional and genetic characterization of Sixteen Patients Suffering from Chronic Granulomatous Disease variants - Identification of Eleven Novel Mutations in CYBB.
Fiche publication
Date publication
septembre 2020
Journal
Clinical and experimental immunology
Auteurs
Membres identifiés du Cancéropôle Est :
Dr FOUYSSAC Fanny
Tous les auteurs :
Mollin M, Beaumel S, Vigne B, Brault J, Roux-Buisson N, Rendu J, Barlogis V, Catho G, Dumeril C, Fouyssac F, Monnier D, Gandemer V, Revest M, Brion JP, Bost-Bru C, Jeziorski E, Laurence Eitenschenck, Jarrasse C, Haus SD, Houachée-Chardin M, Hancart M, Gérard Michel, Bertrand Y, Plantaz D, Kelecic J, Traberg R, Kainulainen L, Fauré J, Fieschi F, Stasia MJ
Lien Pubmed
Résumé
Chronic Granulomatous Disease (CGD) is a rare inherited disorder in which phagocytes lack NADPH oxidase activity. The most common form is the X-linked CGD (X91-CGD), caused by mutations in the CYBB gene. Clinical, functional and genetic characterizations of 16 CGD cases of male patients and their relatives were done. We classified them as suffering from different variants of CGD (X91 , X91 or X91 ) according to NOX2 expression and NADPH oxidase activity in neutrophils. Eleven mutations were novel (9 X91 -CGD and 2 X91 -CGD). One X91 -CGD was due to a new and extremely rare double missense mutation Thr208Arg-Thr503Ile. We investigated the pathological impact of each single using stable transfection of each mutated cDNA in the NOX2 knock-out PLB-985 cell line. Both mutations leading to X91 -CGD were also novel; one deletion c.-67delT was localized in the promoter region of CYBB, the second one c.253-1879A>G mutation activates a splicing donor site, which unveils a cryptic acceptor site, leading to the inclusion of a 124-nucleotide pseudo-exon between exons 3 and 4 and responsible for the partial loss of NOX2 expression. Both X91 -CGD mutations were characterized by a low cytochrome b expression and a faint NADPH oxidase activity. The functional impact of new missense mutations is discussed in the context of a new 3D-model of the dehydrogenase domain of NOX2. Our study demonstrates that low NADPH oxidase activity found in both X91 -CGD patients correlates with mild clinical forms of CGD whereas X91 -CGD and X91 -CGD cases remain the most clinically severe forms.
Mots clés
NADPH oxidase, NOX, X-linked CGD variants, clinical severity
Référence
Clin. Exp. Immunol.. 2020 Sep 20;: