Rice Allergenic Protein and Molecular-genetic Approach for Hypoallergenic Rice.

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Allergenic proteins with a molecular mass of about 14 to 16 kDa were isolated from a rice salt-soluble fraction based on the reactivity with IgE antibodies from patients allergic to rice. cDNA clones encoding these allergenic proteins were isolated from a cDNA library of maturing rice seeds, and the deduced amino acid sequences showed considerable similarity to wheat and barley α-amylase/trypsin inhibitors, which have recently been identified as major allergens associated with baker's asthma. An antisense RNA strategy was applied to repress the allergen gene expression in maturing rice seeds. Immunoblotting and ELISA analyses of the seeds using a monoclonal antibody to a 16-kDa allergen showed that allergen content of seeds from several transgenic rice plants was markedly lower than that of the seeds from parental wild type rice.

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