Recombinant allergens for skin testing

Skin testing is a basic diagnostic procedure widely used to explore immedia te-type reactions to allergen preparations in vivo. Despite their reliabili ty, if standardized extracts are used, skin tests suffer from limited repro ducibility due to difficulties In preparing consistently standardized extra cts from natural raw material. Starting from allergen-encoding cDNAs, large amounts of highly pure allergens with a high batch-to-batch consistency sa tisfying the quality requirements of medicinal products manufactured by rec ombinant DNA technology can be produced. These reagents are expected to be qualitatively superior to the commercially available allergen preparations used for the in vitro and in vivo diagnosis of allergic conditions. In this article the current literature available on skin testing with such recombi nant allergens (rAllergens) is reviewed and critically analyzed. To date ma ny different rAllergens of various pollens, moulds, mites, bee venom, latex and celery have been used in skin testing in more than 1,600 allergic and control individuals. Skin: prick tests as well as intradermal skin tests wi th rAllergens prove to be highly specific and safe. The diagnostic sensitiv ity of single rAllergens is generally lower than those obtained with allerg en extracts, but can be considerably increased by using rAllergen panels co vering the most important allergenic structures present in a given complex allergenic extract. Moreover, quantitative skin testing with single rAllerg ens allows interesting insights into correlations between the in vivo and i n vitro sensitization to a given allergen. In conclusion, skin testing with rAllergens offers a highly specific and safe additional diagnostic tool to elucidate patient- and disease-specific sensitization patterns which will be needed for the development of patient-tailored immunotherapeutic treatme nts. Copyright (C) 2001 S. Karger AG, Basel.