HLA-DRA variants predict penicillin allergy in genome-wide fine-mapping genotyping

Background Immediate reactions to β-lactams are the most common causes of anaphylactic reactions and can be life-threatening. The few known genetic factors influencing these reactions suggest a link with atopy and inflammation. Objective We performed a fine-mapping genome-wide association study of t...

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Published in:Journal of allergy and clinical immunology 2015-01, Vol.135 (1), p.253-259.e10
Main Authors: Guéant, Jean-Louis, MD, PhD, Romano, Antonino, MD, Cornejo-Garcia, Jose-Antonio, PhD, Oussalah, Abderrahim, MD, PhD, Chery, Celine, PhD, Blanca-López, Natalia, MD, Guéant-Rodriguez, Rosa-Maria, MD, PhD, Gaeta, Francesco, MD, Rouyer, Pierre, MSc, Josse, Thomas, BSc, Canto, Gabriella, MD, Carmona, F. David, PhD, Bossini-Castillo, Lara, PhD, Martin, Javier, MD, PhD, Laguna, Jose-Julio, MD, Fernandez, Javier, MD, Feo, Francisco, MD, Ostrov, David A., PhD, Plasencia, Pablo C., PhD, Mayorga, Cristobalina, PhD, Torres, Maria-Jose, MD, Blanca, Miguel, MD, PhD
Format: Article
Language:English
Subjects:
Allergy and Immunology
amoxicillin
anaphylaxis
Drug allergy
Drug Hypersensitivity - epidemiology
Drug Hypersensitivity - etiology
Drug Hypersensitivity - genetics
Female
Genetic Predisposition to Disease
genome-wide association
Genome-Wide Association Study
Genotype
HLA-DR alpha-Chains - genetics
HLA-DRA
Humans
immediate-type reactions
Italy - epidemiology
Life Sciences
Male
penicillins
Penicillins - adverse effects
Polymorphism, Single Nucleotide
Spain - epidemiology
β-lactams
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Summary:Background Immediate reactions to β-lactams are the most common causes of anaphylactic reactions and can be life-threatening. The few known genetic factors influencing these reactions suggest a link with atopy and inflammation. Objective We performed a fine-mapping genome-wide association study of the genetic predictors of β-lactam allergy to better understand the underlying mechanisms. Methods We studied 387 patients with immediate allergic reactions to β-lactams and 1124 paired control subjects from Spain. We replicated the results in 299 patients and 362 paired control subjects from Italy. Results We found significant associations with the single nucleotide polymorphisms rs4958427 of ZNF300 (c.64-471G>A, P  = 9.9 × 10−9 ), rs17612 of C5 (c.4311A>C [p.Glu1437Asp], P  = 7.5 × 10−7 ), rs7754768 and rs9268832 of the HLA-DRA | HLA-DRB5 interregion ( P  = 1.6 × 10−6 and 4.9 × 10−6 ), and rs7192 of HLA-DRA (c.724T>G [p.Leu242Val], P  = 7.4 × 10−6 ) in an allelic model, with similar results in an additive model. Single nucleotide polymorphisms of HLA-DRA and ZNF300 predicted skin test positivity to amoxicillin and other penicillins but not to cephalosporins. A haplotype block in HLA-DRA and the HLA-DRA | HLA-DRB5 interregion encompassed a motif involved in balanced expression of the α- and β-chains of MHC class II, whereas rs7192 was predicted to influence α-chain conformation. HLA-DRA rs7192 and rs8084 were significantly associated with allergy to penicillins and amoxicillin ( P  = 6.0 × 10−4 and P  = 4.0 × 10−4 , respectively) but not to cephalosporins in the replication study. Conclusions Gene variants of HLA-DRA and the HLA-DRA | HLA-DRB5 interregion were significant predictors of allergy to penicillins but not to cephalosporins. These data suggest complex gene-environment interactions in which genetic susceptibility of HLA type 2 antigen presentation plays a central role.
ISSN:0091-6749
1097-6825
DOI:10.1016/j.jaci.2014.07.047