Humans have used Quercus ilex acorns as a staple food since ancient times. Recently, their nutritional and nutraceutical value has revived interest for human consumption. Ensuring their safety as food requires assessing their allergenic potential. In this work, we predicted the allergenic profile of acorns by in silico analysis of the Q. ilex genome and transcriptome. In addition, immunoblot analysis of pooled sera from patients allergic to various dry fruits was performed, with immunoreactive bands subjected to mass spectrometry analysis. The most remarkable allergens identified belong to the Bet v 1, profilin, prolamin, Hsp70 and cyclophilin families. Acorns from different mother trees exhibited also different IgE sensitization patterns. Thus, acorns from trees showing damage symptoms, and located in declined areas, had higher allergen contents than those from healthy ones, which corresponded to higher abundance of stress-related proteins.
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