Multiplexed Protein Detection Using Magnetic Barcode Immuno-PCR
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Solution Overview
Problem
Existing methods for multiplexed analyte detection, such as ELISA and immuno-PCR, face limitations in sensitivity, specificity, and complexity, particularly in handling multiple capture antibodies in a single well, and lack efficient multiplex analysis for detecting and quantitating multiple analytes over a broad dynamic range.
Innovation Solution
A multiplexed immuno-PCR assay system combined with qPCR or NGS readout, utilizing magnetic particle separation and oligonucleotide barcode sequences, allows for high sensitivity and specificity in detecting and quantitating multiple analytes by forming capture agent-analyte complexes, followed by magnetic separation and washing to remove interfering compounds, and using qPCR or NGS to analyze barcode sequences for quantitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard ELISA assays are used for analyte detection, then the assay procedure is simple and well-established, but the sensitivity and specificity are insufficient and multiplexing is not readily achievable
Solution Approach 1:
The patent combines ELISA's affinity capture mechanism with PCR's exponential signal amplification in a single integrated assay workflow. Capture antibodies are used to immobilize target analytes, followed by detection antibodies conjugated to oligonucleotide barcodes that serve as templates for PCR amplification. This merging achieves 10-1000-fold sensitivity improvement over standard ELISA while maintaining a streamlined procedure requiring only one well per analyte panel.
Solution Approach 2:
Oligonucleotide barcodes serve as intermediary molecules that bridge the immunological recognition step and the nucleic acid amplification step. Detection antibodies are conjugated to these barcodes, which then serve as unique molecular identifiers and PCR templates. This intermediary enables signal transduction from protein-protein binding events to exponentially amplifiable nucleic acid signals, resolving the contradiction between simplicity and sensitivity.
2Reliability
If immuno-PCR is used to improve sensitivity over ELISA, then detection sensitivity increases 10-1000 fold, but the complexity of handling multiple capture antibodies in a single well becomes prohibitive
Solution Approach 1:
The patent segments the detection system by assigning each analyte in the multiplex panel its own dedicated capture antibody and detection antibody pair with unique oligonucleotide barcodes. Each analyte is detected in a separate well or reaction chamber, avoiding the complexity of simultaneous multi-antibody interactions in a single well. This segmentation enables accurate quantitation of multiple analytes while maintaining immuno-PCR's high sensitivity.
Solution Approach 2:
The patent creates a universal detection platform where the same PCR amplification and detection methodology can be applied to any panel of analytes. The system uses standardized oligonucleotide barcode sequences that can be universally amplified by the same PCR conditions, and the same data analysis pipeline processes results for all analytes. This universality reduces the operational complexity of multiplexing while maintaining high sensitivity across all targets.
3Productivity
If multiple analytes are detected in a single well using capture antibodies, then multiplexing capacity is increased, but the ability to accurately measure analytes over several orders of magnitude concentration range is compromised
Solution Approach 1:
The patent transitions from spatial multiplexing (multiple analytes in the same physical space/well) to temporal/signal-space multiplexing (multiple analytes detected through distinct oligonucleotide barcode sequences that are differentiated by sequence identity). Each analyte's signal is amplified independently through PCR, and quantitation is achieved by measuring the abundance of specific barcode sequences. This dimensional change enables accurate measurement across several orders of magnitude concentration range while maintaining high multiplexing capacity, as each barcode can be independently quantified without interference from other analytes.
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 system enables accurate detection and quantitation of multiple analytes, exceeding standard PCR's multiplexing capacity, with the ability to analyze at least six analytes in a single assay and providing a broad dynamic range of concentration measurement, suitable for decentralized laboratory settings.
Implementation Method 1
The formed capture agent-analyte complex linked to the magnetic particle is separated from the sample milieu by placing in a magnetic field
Implementation Method 2
Each capture agent is configured to specifically bind to a distinct analyte
Implementation Method 3
combining the washed capture agent-analyte complex and the set of detection agents to allow the detection agent to specifically bind to the capture agent-analyte complex, to produce a capture agent-analyte-detection agent complex linked to the magnetic particle; performing a quantitative measuring step on the oligonucleotide barcode sequences in the washed capture agent-analyte-detection agent complex in a multiplexed assay to detect and/or quantitate one or more of the analytes
Data Source
AI summary
Multiplex analysis methods and systems for accurately detecting and quantitating multiple analytes in a sample are disclosed. The sample is contacted with an analyte capturing agent and immobilized on a magnetic particle, followed by magnetic separation and washing of the particle and bound analyte. This complex is then contacted with a detection agent labeled with an oligonucleotide barcode specific to the analyte target, followed by quantitative measurement of the barcode by qPCR or NGS. The combination of a plurality of analyte capture particles and cognate detection probes allows multiple analytes to be assayed simultaneously and in a multiplex manner.