Identification of the basic subunit of Ara h 3 as the major allergen in a group of children allergic to peanuts

Patrizia Restani, Cinzia Ballabio, Emanuela Corsini, Alessandro Fiocchi, Patrizia Isoardi, Chiara Magni, Claudio Poiesi, Luigi Terracciano, Marcello Duranti

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Several proteins have been identified as peanut allergens; among them, Ara h 1 (7S globulin) and Ara h 2 (2S globulin) are usually considered the major allergens. Objective: To identify the major allergens in a group of children selected for their specific pattern of immunoreactivity. Methods: We identified the dominant allergen by using (1) amino acid sequencing of the bands that show the strongest IgE immunoreactivity in 1-dimensional electrophoresis and immunoblotting and (2) specific animal IgGs raised against the dominant immunoreactive band to pinpoint the allergen(s) in peanut proteins separated by 2-dimensional electrophoresis and immunoblotting. To confirm these data, we further examined the peanut proteome using serum samples from the children with the unusual immunoreactivity. Results: We found a group of children with marked peanut allergy who are specifically sensitized to the basic subunit of Ara h 3 (11S globulin family). Conclusion: That the dominant immunoreactivity in these patients is in a basic subunit of Ara h 3 was unexpected, because previous studies had indicated that Ara h 3 was only a minor peanut allergen and that the identified allergenic epitopes occurred mainly in the acidic Ara h 3 subunit.

Original languageEnglish
Pages (from-to)262-266
Number of pages5
JournalAnnals of Allergy, Asthma and Immunology
Volume94
Issue number2
Publication statusPublished - Feb 2005

ASJC Scopus subject areas

  • Immunology and Allergy

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