Document Detail

HLA-DRA variants predict penicillin allergy in genome-wide fine-mapping genotyping.
MedLine Citation:
PMID:  25224099     Owner:  NLM     Status:  Publisher    
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.
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 Mayorga; Maria-Jose Torres; Miguel Blanca
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-9-12
Journal Detail:
Title:  The Journal of allergy and clinical immunology     Volume:  -     ISSN:  1097-6825     ISO Abbreviation:  J. Allergy Clin. Immunol.     Publication Date:  2014 Sep 
Date Detail:
Created Date:  2014-9-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1275002     Medline TA:  J Allergy Clin Immunol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014 American Academy of Allergy, Asthma & Immunology. Published by Elsevier Inc. All rights reserved.
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