HLA-DRA variants predict penicillin allergy in genome-wide fine-mapping genotyping.
Fiche publication
Date publication
janvier 2015
Auteurs
Membres identifiés du Cancéropôle Est :
Pr GUEANT Jean-Louis, Dr OUSSALAH Abderrahim
Tous les auteurs :
Gueant JL, Romano A, Cornejo-Garcia JA, Oussalah A, Chery C, Blanca-Lopez N, Gueant-Rodriguez RM, Gaeta F, Rouyer P, Josse T, Canto G, Carmona FD, Bossini-Castillo L, Martin J, Laguna JJ, Fernandez J, Feo F, Ostrov DA, Plasencia PC, Mayorga C, Torres MJ, Blanca M
Lien Pubmed
Résumé
BACKGROUND: Immediate reactions to beta-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 beta-lactam allergy to better understand the underlying mechanisms. METHODS: We studied 387 patients with immediate allergic reactions to beta-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 x 10(-9)), rs17612 of C5 (c.4311A>C [p.Glu1437Asp], P = 7.5 x 10(-7)), rs7754768 and rs9268832 of the HLA-DRA | HLA-DRB5 interregion (P = 1.6 x 10(-6) and 4.9 x 10(-6)), and rs7192 of HLA-DRA (c.724T>G [p.Leu242Val], P = 7.4 x 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 alpha- and beta-chains of MHC class II, whereas rs7192 was predicted to influence alpha-chain conformation. HLA-DRA rs7192 and rs8084 were significantly associated with allergy to penicillins and amoxicillin (P = 6.0 x 10(-4) and P = 4.0 x 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.
Référence
J Allergy Clin Immunol. 2015 Jan;135(1):253-9