Aptamer-Regulated Nucleic Acid Sensors for Multiplexed Protein Detection
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Solution Overview
Problem
Current analyte detection methods face challenges with nonspecific binding and assay noise, limiting sensitivity and the ability to detect multiple analytes simultaneously, particularly in protein detection where significant multiplexed protein detection assays are lacking.
Innovation Solution
Development of aptamer-regulated nucleic acid sensors, or ampliSwitches, which comprise a priming sequence domain that hybridizes to a nucleic acid target and an aptamer domain that binds to ligands, inducing conformational changes to alter the priming sequence's activity, enabling sensitive and specific detection of analytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional antibody-based immunoassays or mass spectrometry are used for protein detection, then detection capability is achieved, but nonspecific binding and assay noise occur, limiting sensitivity
Solution Approach 1:
The patent uses nucleic acid amplification intermediaries (primers, templates, polymerases) to convert protein detection into a nucleic acid-based signaling process. The aptamer-protein binding event is transduced through nucleic acid hybridization and amplification, creating an intermediary signaling pathway that avoids direct detection limitations of conventional immunoassays
Solution Approach 2:
The patent replaces the mechanical/chemical binding detection of immunoassays with a nucleic acid hybridization and amplification system. The detection mechanism shifts from direct antibody-antigen binding measurement to nucleic acid-based signal amplification, which provides higher sensitivity and lower background noise
2Adaptability or versatility
If multiple protein detection is attempted using conventional methods, then detection capability is limited, but device complexity and assay difficulty increase significantly
Solution Approach 1:
The patent segments the detection system into modular components: unique primers, templates, and aptamers for each target protein. Each analyte is detected through its own dedicated nucleic acid amplification reaction, allowing multiple detections to be performed in parallel without cross-interference, thereby enabling multiplexed detection while maintaining manageable assay complexity
Solution Approach 2:
The patent employs universal nucleic acid amplification machinery (polymerases, buffers, cycling conditions) that can process multiple different primer-template-aptamer combinations simultaneously. This universal platform allows the same basic detection mechanism to be applied to multiple different proteins, achieving multiplexed detection without requiring separate complex assay systems for each target
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
AmpliSwitches provide a versatile tool for detecting analytes by switching between 'on' and 'off' states in response to ligand binding, allowing for sensitive and specific detection, including multiplexed analysis, enhancing the sensitivity and specificity of analyte detection assays.
Implementation Method 1
a priming sequence domain that hybridizes to a nucleic acid target template
Implementation Method 2
an aptamer domain that binds to a ligand molecule and induces an allosteric or conformational change in the nucleic acid
Data Source
AI summary
The invention relates to aptamer-regulated, ligand-responsive nucleic acids, or “ampliSwitches,” and uses thereof. Particular embodiments include a ligand-responsive nucleic acid that comprises a primer sequence domain and an aptamer domain that is responsive to a ligand.