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IgE and IgG epitopes revealed on the major fish allergen Lat c 1. | LitMetric

IgE and IgG epitopes revealed on the major fish allergen Lat c 1.

Mol Immunol

Molecular Allergy Research Laboratory, College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, QLD, Australia; Australian Institute of Tropical Health and Medicine, James Cook University, Townsville, QLD, Australia; Centre for Food and Allergy Research, Murdoch Children's Research Institute, Melbourne, VIC, Australia. Electronic address:

Published: March 2021

AI Article Synopsis

Article Abstract

Background: The IgE- and IgG-binding patterns of the major fish allergen parvalbumins are not clearly understood. IgE antibody-binding to parvalbumin from Asian seabass, Lat c 1.01, is implicated in up to 90 % of allergic reactions, although the region of IgE or IgG4 epitopes are unknown. In the present study, we characterized the specific IgE- and IgG-binding regions of Lat c 1.01 using serum from pediatric and adult patients with clinically-confirmed fish allergy.

Methods: A comparative investigation of patient IgE- and IgG-binding to recombinant Lat c 1.01 was performed by immunoblotting and indirect ELISA using serum from 15 children and eight adults with clinically confirmed IgE-mediated reactions to fish. The IgE- and IgG-binding regions of Lat c 1.01 were determined by inhibition ELISA using seven overlapping peptides spanning the entire 102 amino acid sequence. Elucidated IgE-binding regions were modelled and compared to known antibody-binding regions of parvalbumins from five other fish species.

Results: Ninety five percent (22/23) patients demonstrated IgE-binding to rLat c 1.01, while fewer patients (10/15 children and 7/8 adults) demonstrated robust IgG binding when determined by immunoblots. IgE-binding for both cohorts was significantly higher compared to IgG-binding by ELISA. All patients in this study presented individual IgE and IgG epitope-recognition profiles. In addition to these patient-specific antibody binding sites, general IgE epitopes were also identified at the C- and N-terminal regions of this major fish allergen.

Conclusions And Clinical Relevance: Our findings demonstrate two specific IgE epitopes on parvalbumin from Asian seabass, while IgG binding is much lower and patient specific. This study highlights the importance of advancement in epitope analysis regardless of the age group for diagnostics and immunotherapies for fish allergy.

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Source
http://dx.doi.org/10.1016/j.molimm.2020.12.033DOI Listing

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