Nanobody-based food allergen surveillance: current status and prospects

Abstract

Abstract The incidence of food allergy has increased in recent decades, posing drastic risks to sensitive individuals, leading to mild to severe allergic symptoms. There is still no effective immune therapeutic strategy for food allergy that addresses accurate analytical methods to indicate the presence of allergens to prevent exposure of sensitive individuals. Currently, the most commonly applied detection method is immunoassay developed with food allergen-specific antibodies, especially the conventional formats of monoclonal antibodies (mAbs) and polyclonal antibodies (pAbs), which serve as dominant detection reagents for food allergen analysis, although with the disadvantages of being labor-intensive, costly, batch differences, and significant cross-reaction, etc. Camelid-derived nanobodies (Nbs) have attracted tremendous attention to explore their application in food hazard analysis because of robust characteristics like unique paratopes, high stability and affinity that strongly contribute to the beneficial effect. However, extensive analysis is needed to validate the potential use of Nbs as detection reagents and the advantages for food allergen surveillance. Previous reports have demonstrated the potential of Nbs for immunoassay development against food allergens, such as macadamia allergen Mac i 1, peanut allergens Ara h 1 and Ara h 3, lupin allergen Lup an 1, milk allergen β-lactoglobulin, etc. In this review, we comprehensively summarize the structural and biochemical properties of Nbs that benefit the application of Nb-based immunoassay, as well as the representative detection strategies, to provide research data for newly developed Nb formats for food allergen analysis, and investigate the future establishment of Nb-based surveillance against major food allergens.