Macadamia Allergen Detection Using Isolated Proteins
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current diagnostic methods for macadamia nut allergy are unreliable due to false negatives and insufficient specificity, as they rely on whole nut extracts or partially purified extracts, which are prone to instability and cross-reactivity, lacking specific allergens for reliable diagnosis and treatment.
Innovation Solution
Development of a method using isolated or recombinant polypeptides from macadamia proteins (53-67 kDa and 20-25 kDa) with tags for detection and purification, immobilized on solid supports, for detecting antibodies in patient samples, and a diagnostic kit for differential diagnosis and treatment of macadamia nut allergy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If whole nut extracts or partially purified extracts are used for diagnosis, then the method is simple to perform, but the diagnostic reliability and sensitivity are insufficient due to false negatives and cross-reactivity
Solution Approach 1:
The patent extracts and isolates specific allergenic proteins (Mac f 1 and Mac f 2) from macadamia nut extracts, separating them from other proteins that cause cross-reactivity. This extraction of the essential allergenic components while removing interfering substances directly resolves the contradiction by improving diagnostic reliability through specific antigen-antibody recognition, eliminating false positives and negatives associated with whole nut extracts.
Solution Approach 2:
The patent segments the complex macadamia nut protein mixture into distinct allergenic components (Mac f 1 at 53-67 kDa and Mac f 2 at 20-25 kDa). By dividing the whole nut extract into specific protein fractions with defined molecular weights and isoelectric points, the assay achieves higher sensitivity and specificity. This segmentation allows individual allergens to be detected separately, improving diagnostic reliability without requiring overly complex multi-step procedures.
2Measurement precision
If whole nut extracts are used, then cross-reactivity occurs reducing specificity, but isolating specific allergens increases assay complexity
Solution Approach 1:
The patent extracts specific allergenic proteins (Mac f 1 and Mac f 2) from macadamia nut extracts, separating them from other proteins that cause cross-reactivity. This extraction of the essential allergenic components while removing interfering substances directly resolves the contradiction by improving diagnostic reliability through specific antigen-antibody recognition, eliminating false positives and negatives associated with whole nut extracts.
Solution Approach 2:
The patent applies local quality by characterizing specific regions of the protein space defined by molecular weight (53-67 kDa for Mac f 1, 20-25 kDa for Mac f 2) and isoelectric point (pH 6.3-8.7 for Mac f 1, pH 6.5-7.9 for Mac f 2). By focusing on these specific local regions in the 2D SDS PAGE separation space, the assay achieves high diagnostic specificity while using standard electrophoresis techniques rather than complex purification methods.
3Measurement precision
If conventional skin prick assays with whole extracts are used, then the procedure is simple, but false negative results occur frequently due to insufficient allergen concentration
Solution Approach 1:
The patent performs preliminary separation of allergens using 2D SDS PAGE electrophoresis to concentrate specific allergenic proteins (Mac f 1 and Mac f 2) into distinct bands before transferring them to membranes for immunoblotting. This preliminary concentration step ensures that sufficient allergen is present for reliable detection, eliminating false negatives while maintaining a straightforward two-step workflow that combines electrophoresis with standard immunoblotting procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method provides improved diagnostic reliability and sensitivity for macadamia nut allergy, allowing for effective differentiation from other nut allergies and monitoring of therapy, with specific antibodies binding to macadamia proteins, enhancing treatment efficacy.
Implementation Method 1
a protein running in a 2D SDS PAGE at pH 6.3 to 8.7 and 53 to 67 kDa
Implementation Method 2
a protein running in a 2D SDS PAGE at pH 6.5 to 7.9 and 20 to 25 kDa
Implementation Method 3
detecting antibodies in patient samples, and a diagnostic kit for differential diagnosis and treatment of macadamia nut allergy
Data Source
AI summary
Provided is a polypeptide comprising a macadamia protein running in a 2D SDS PAGE at pH 6.3 to 8.7 and 53 to 67 kDa or a protein running in a 2D SDS PAGE at pH 6.5 to 7.9 and 20 to 25 kDa or an antigenic variant thereof, and a tag for detection and/or purification, a polypeptide fused with the macadamia protein, or the macadamia protein is modified by glycosylation, phosphorylation, acetylation, decarboxylation, citrullination, or hydroxylation.