Fc-binding Molecule Signal Amplification in Immunoassays
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Solution Overview
Problem
Current immunoassays lack sufficient sensitivity for detecting antibodies, particularly for infectious agents, which hinders accurate and rapid diagnostic capabilities.
Innovation Solution
Incorporating detectable Fc-binding molecules such as Protein A or Protein G conjugates, either alone or in combination with other detectable entities, to enhance antibody detection in immunoassays by forming complexes with antibodies and amplifying signals in antigen-based capture or sandwich-type assays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional immunoassay methods are used, then the assay can be performed with simple procedures, but the sensitivity of antibody detection is insufficient
Solution Approach 1:
The patent introduces Fc-binding molecules (Protein A or Protein G) as intermediary components that bind to the Fc region of antibodies. These molecules serve as mediators between the antibody and the detectable label, enabling signal amplification without fundamentally changing the basic immunoassay procedure. The Fc-binding molecules act as a bridge that allows multiple detectable labels to associate with each antibody, thereby increasing sensitivity while maintaining procedural simplicity.
2Measurement precision
If Fc-binding molecules are added to amplify signals, then the sensitivity of detection increases, but the complexity of the assay increases
Solution Approach 1:
The Fc-binding molecules serve multiple functions simultaneously: they bind specifically to the Fc region of antibodies, provide attachment sites for detectable labels, and enable signal amplification. This multi-functionality allows a single component to address multiple requirements (specificity, detectability, and amplification) without requiring separate complex systems for each function.
3Measurement precision
If multiple detectable entities are used for signal amplification, then the detection limit is reduced, but the manufacturing complexity increases
Solution Approach 1:
The Fc-binding molecules naturally provide multiple binding sites that can simultaneously bind multiple detectable labels without requiring complex external assembly processes. The self-service principle is manifested in how the Fc-binding molecule's structure inherently enables multi-label attachment, reducing the need for complex manufacturing procedures to assemble the conjugates.
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 use of Fc-binding molecules significantly increases the sensitivity of antibody detection, allowing for more accurate and rapid identification of antibodies in samples, even at low concentrations, thereby improving diagnostic efficiency.
Implementation Method 1
the addition of detectable Fc-binding molecules (e.g., Protein A- conjugates, Protein G-conjugates, secondary antibody conjugates) can be used for the detection of antibodies in immunoassays
Implementation Method 2
antibodies to be detected are captured by antibody-specific binding entities, e.g., antigens
Data Source
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AI summary
The present invention provides methods, devices, compositions (e.g., capture complexes), and kits useful for enhancing the detection of antibodies in a test sample. The methods, devices, and compositions utilize detectable Fc-binding molecules such as Protein A, Protein G, and/or an Fc-specific antibody to amplify the signal of a detected antibody in immunoassays, such as lateral flow assays.