Direct Autoantibody Immunoassay With Single-Step Antigen Binding
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Solution Overview
Problem
Existing methods for detecting autoantibodies in biological samples suffer from low sensitivity and specificity, and indirect binding assays are time-consuming and require additional reagents.
Innovation Solution
A direct immunoassay method involving a single step where a biological sample is incubated with a solid support having an unlabeled antigen and a labeled antigen that does not bind to the support, forming a solid support/labeled antigen complex proportional to the antibody presence, allowing direct detection of antibodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If competition assays are used to detect autoantibodies, then the assay can detect autoantibodies based on signal displacement, but the sensitivity and specificity of the reagents and assays are insufficient
Solution Approach 1:
The patent introduces a secondary antibody as an intermediary detection layer. The secondary antibody specifically binds to the primary autoantibody-antigen complex, amplifying the detection signal and enabling more sensitive and specific detection of autoantibodies through multiple immunoglobulin binding interactions
Solution Approach 2:
The patent replaces the traditional competition-based detection mechanism with a direct binding mechanism followed by secondary antibody detection. This substitution eliminates the need for signal displacement and allows for more reliable and sensitive autoantibody detection through direct antigen-antibody complex formation and amplification
2Measurement precision
If indirect binding assays are used to detect autoantibodies, then the assay can detect autoantibodies through secondary antibody binding, but the assay time is increased and additional reagents are required
Solution Approach 1:
The patent combines the antigen binding step and the detection step into a single integrated process. The secondary antibody is pre-bound to the solid support along with the antigen, allowing autoantibodies in the sample to be detected directly without separate incubation and washing steps required in traditional indirect assays
Solution Approach 2:
The patent performs preliminary preparation by pre-coating the solid support with both the antigen and secondary antibody before sample addition. This preliminary action eliminates the need for multiple sequential steps during the actual assay, significantly reducing total assay time while maintaining detection capability
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 faster and more sensitive detection of autoantibodies, with improved specificity and reduced assay time compared to traditional competition assays.
Implementation Method 1
a solid support having an unlabeled antigen bound thereto, wherein the unlabeled antigen is specifically recognized by the antibody; and a labeled antigen, wherein the labeled antigen does not bind to the solid support and is specifically recognized by the antibody, wherein, in the presence of the antibody, a solid support/labeled antigen complex is formed
Data Source
AI summary
Disclosed herein are immunoassays for detecting an antibody in a biological sample from a subject and/or diagnosing an autoimmune disease in a subject. The disclosed immunoassays use a single, direct step to assess the level of antibody in a biological sample from the subject by simultaneously binding the antibody to a capture antigen (e.g. an unlabeled antigen bound to a solid support) and a labeled antigen not bound to the solid support.