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

Jean-Louis Guéant, Antonino Romano, Jose-Antonio Cornejo-Garcia, Abderrahim Oussalah, Celine Chery, Natalia Blanca-López, Rosa-Maria Guéant-Rodriguez, Francesco Gaeta, Pierre Rouyer, Thomas Josse, Gabriella Canto, F. David Carmona, Lara Bossini-Castillo, Javier Martin, Jose-Julio Laguna, Javier Fernandez, Francisco Feo, David A. Ostrov, Pablo C. Plasencia, Cristobalina MayorgaMaria-Jose Torres, Miguel Blanca

Research output: Contribution to journalArticle

52 Citations (Scopus)


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. Copyright © 2014 American Academy of Allergy, Asthma & Immunology. All rights reserved. KEYWORDS: Drug allergy; HLA-DRA; amoxicillin; anaphylaxis; genome-wide association; immediate-type reactions; penicillins; β-lactams
Original languageEnglish
Pages (from-to)253-259
Number of pages7
JournalJournal of Allergy and Clinical Immunology
Publication statusPublished - 2015


  • genetic predictors


Dive into the research topics of 'HLA-DRA variants predict penicillin allergy in genome-wide fine-mapping genotyping'. Together they form a unique fingerprint.

Cite this