Comparative diagnostics of allergy using quantitative immuno-PCR and ELISA

Abstract

Aim: Estimation of specific IgE is essential for the prevention of allergy progression. Quantitative immuno-PCR (qiPCR) can increase the sensitivity of IgE detection. We aimed to develop qiPCR and compare it to the conventional ELISA in identification of IgE to Alt a 1 and Fel d 1 allergens. Results: Single stranded 60-mer DNA conjugated to streptavidin was used to detect antigen–IgE–biotin complex by qiPCR. In semi-logarithmic scale qiPCR data were linear in a full range of serum dilutions resulting in three- to ten-times higher sensitivity of qiPCR in comparison with ELISA in IgE estimation in low titer sera. Conclusion: Higher sensitivity of qiPCR in identification of low titer IgE is a result of a higher linearity of qiPCR data.