Peanut-allergic subjects and their peanut-tolerant siblings have large differences in peanut-specific IgG that are independent of HLA class II.
Dreskin SC, Tripputi MT, Aubrey MT, Mustafa SS, Atkins D, Leo HL, Song B, Schlichting D, Talwar H, Wang Q, Freed BM. Peanut-allergic subjects and their peanut-tolerant siblings have large differences in peanut-specific IgG that are independent of HLA class II. Clin Immunol. 2010 Dec; 137(3):366-73.