Aptamer-Based Assays for Small Molecule Detection
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Solution Overview
Problem
Traditional antibody-based sandwich assays are ineffective for detecting small molecules with limited or no multiple epitopes, such as steroids and peptides, due to their inability to bind to two antibodies simultaneously.
Innovation Solution
The use of aptamer-based assays, specifically primary aptamers and anti-aptamers with detectable moieties, where the primary aptamer binds to the analyte and the anti-aptamer is complementary, allowing for detection through fluorescence quenching or release, enabling the detection of small molecules like deoxycorticosterone, aldosterone, cortisol, testosterone, and phenylalanine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional antibody-based sandwich assays are used, then detection of large molecules with multiple epitopes is effective, but detection of small molecules with limited epitopes fails
Solution Approach 1:
The patent introduces an anti-aptamer as an intermediary component that binds to the primary aptamer-analyte complex. This intermediary enables the detection of small molecules by providing an additional binding element that antibodies cannot provide, thus resolving the limitation of detecting molecules with limited epitopes while maintaining detection precision
Solution Approach 2:
The patent changes the binding parameters by using aptamers with different binding characteristics compared to antibodies. Aptamers can bind to small molecules with high affinity and can be designed to expose specific regions for anti-aptamer binding, enabling detection of small molecules that were previously undetectable by antibody-based methods
2Measurement precision
If aptamer-based assays with detectable moieties are used, then detection sensitivity for small molecules improves, but assay complexity increases
Solution Approach 1:
The patent combines the primary aptamer, anti-aptamer, and detectable moiety into an integrated assay system. By merging these components into a single coordinated mechanism, the assay achieves high detection sensitivity for small molecules while avoiding the need for separate complex detection systems that would increase overall assay complexity
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
This approach allows for sensitive and specific detection of small molecules by utilizing aptamer pairs that bind selectively to their targets, overcoming the limitations of traditional assays and providing a method for measuring analyte presence and concentration accurately.
Implementation Method 1
the primary aptamer comprises a fluorescent label and the anti-aptamer comprises a quencher moiety
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 1E~1F
AI summary
The present invention relates to aptamer-based assays to capture and/or detect analytes comprising primary and secondary aptamers, as well as compositions comprising such primary and secondary aptamers, wherein analytes comprise small molecules that offer limited mutually non-competitive epitopes to antibodies, that is, with limited ability to measure in non-competitive sandwich assays using primary and secondary antibodies or primary and secondary aptamers.