Biallelic interferon regulatory factor 8 mutation: A complex immunodeficiency syndrome with dendritic cell deficiency, monocytopenia, and immune dysregulation - 06/06/18
, Sheetal Maisuria, MSc c, Urszula Cytlak, PhD a, Laura Jardine, MD a, b, Matthew A. Care, PhD d, Kile Green, MSc a, Merry Gunawan, PhD a, ‡, Paul Milne, PhD a, Rachel Dickinson, PhD a, Sarah Wiscombe, MD a, David Parry, PhD e, §, Rainer Doffinger, MD, PhD f, Arian Laurence, MD, PhD a, b, Claudia Fonseca, Lic g, Oda Stoevesandt, PhD g, Andrew Gennery, MD, PhD a, b, Andrew Cant, MD, PhD b, Reuben Tooze, MD, PhD d, A. John Simpson, MD, PhD a, b, Sophie Hambleton, MD, PhD a, b, Sinisa Savic, MD, PhD h, ∗, Gina Doody, PhD d, ∗, Matthew Collin, MD, PhD a, b, ∗Abstract |
Background |
The homozygous K108E mutation of interferon regulatory factor 8 (IRF8) is reported to cause dendritic cell (DC) and monocyte deficiency. However, more widespread immune dysfunction is predicted from the multiple roles ascribed to IRF8 in immune cell development and function.
Objective |
We sought to describe the effect on hematopoiesis and immunity of the compound heterozygous R83C/R291Q mutation of IRF8, which is present in a patient with recurrent viral infection, granuloproliferation, and intracerebral calcification.
Methods |
Variant IRF8 alleles were identified by means of exome sequencing, and their function was tested by using reporter assays. The cellular phenotype was studied in detail by using flow cytometry, functional immunologic assay transcriptional profiling, and antigen receptor profiling.
Results |
Both mutations affected conserved residues, and R291Q is orthologous to R294, which is mutated in the BXH2 IRF8-deficient mouse. R83C showed reduced nuclear translocation, and neither mutant was able to regulate the Ets/IRF composite element or interferon-stimulated response element, whereas R291Q retained BATF/JUN interactions. DC deficiency and monocytopenia were observed in blood, dermis, and lung lavage fluid. Granulocytes were consistently increased, dysplastic, and hypofunctional. Natural killer cell development and maturation were arrested. TH1, TH17, and CD8+ memory T-cell differentiation was significantly reduced, and T cells did not express CXCR3. B-cell development was impaired, with fewer memory cells, reduced class-switching, and lower frequency and complexity of somatic hypermutation. Cell-specific gene expression was widely disturbed in interferon- and IRF8-regulated transcripts.
Conclusions |
This analysis defines the clinical features of human biallelic IRF8 deficiency, revealing a complex immunodeficiency syndrome caused by DC and monocyte deficiency combined with widespread immune dysregulation.
Le texte complet de cet article est disponible en PDF.Graphical abstract |
Key words : Interferon regulatory factor 8, immunodeficiency, dendritic cell, monocyte, myeloproliferation, interferon
Abbreviations used : AICE, BAL, cDC, CDR3, DC, EICE, EMSA, HA, IAD, IRF, ISRE, NK, pDC, SSC, STAT, TF, TLR, Treg
Plan
| Supported by Wellcome Trust (101155/Z13/Z, to V.B.), Bright Red (to V.B. and M.C.), Cancer Research UK (to M.C. [C30484/A21025] and G.D., M.A.C., and R.T. [C7845/A17723]), and the NIHR Newcastle Biomedical Research Centre (to S.W. and A.J.S.). |
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| Disclosure of potential conflict of interest: V. Bigley and U. Cytlak have received a grant from the Wellcome Trust (101155/Z/13/Z). R. Dickinson has received a grant from LLR/Bloodwise (14004). A. Laurence has received a grant from the Crohn's and Colitis Foundation. R. Tooze has received grants from Cancer Research UK/Bloodwise and UCB Pharma and has received payment for lectures from Roche. S. Hambleton has consultant arrangements from UCB and has received payment for lectures from BioTest Forum 2017. G. Doody has received a grant from Cancer Research UK. M. Collin has received a grant from Cancer Research UK (C30484/A21025). The rest of the authors declare that they have no relevant conflicts of interest. |
Vol 141 - N° 6
P. 2234-2248 - juin 2018 Retour au numéro
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