Common variants at PVT1, ATG13–AMBRA1, AHI1 and CLEC16A are associated with selective IgA deficiency

Common variants at PVT1, ATG13–AMBRA1, AHI1 and CLEC16A are associated with selective IgA deficiency

Selective immunoglobulin A deficiency (IgAD) is the most common primary immunodeficiency in Europeans. Our genome-wide association study (GWAS) meta-analysis of 1,635 patients with IgAD and 4,852 controls identified four new significant (P < 5 × 10-8) loci and association with a rare IFIH1 va...

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Bibliographic Details
Main Authors: Bronson, P, Chang, D, Bhangale, T, Seldin, M, Ortmann, W, Ferreira, R, Urcelay, E, Pereira, L, Martin, J, Plebani, A, Lougaris, V, Friman, V, Freiberger, T, Litzman, J, Thon, V, Pan-Hammarström, Q, Hammarström, L, Graham, R, Behrens, T
Format: Journal article
Language:English
Published: Nature Publishing Group 2016
Description
Summary:Selective immunoglobulin A deficiency (IgAD) is the most common primary immunodeficiency in Europeans. Our genome-wide association study (GWAS) meta-analysis of 1,635 patients with IgAD and 4,852 controls identified four new significant (P < 5 × 10-8) loci and association with a rare IFIH1 variant (p.Ile923Val). Peak new variants (PVT1, P = 4.3 × 10-11; ATG13-AMBRA1, P = 6.7 × 10-10; AHI1, P = 8.4 × 10-10; CLEC16A, P = 1.4 × 10-9) overlapped with autoimmune markers (3/4) and correlated with 21 putative regulatory variants, including expression quantitative trait loci (eQTLs) for AHI1 and DEXI and DNase hypersensitivity sites in FOXP3+ regulatory T cells. Pathway analysis of the meta-analysis results showed striking association with the KEGG pathway for IgA production (pathway P < 0.0001), with 22 of the 30 annotated pathway genes containing at least one variant with P ≤ 0.05 in the IgAD meta-analysis. These data suggest that a complex network of genetic effects, including genes known to influence the biology of IgA production, contributes to IgAD.

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