Multiplexed Protein Detection Reducing Cross-Hybridization Noise
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Solution Overview
Problem
Current proteomic assays suffer from high false positive signals due to protein-antibody and oligo-binding cross-reactivity, which are not addressed by existing methods, and genomic data fails to reflect corresponding protein changes, necessitating integration with sensitive proteomic readouts.
Innovation Solution
A multiplex immunoassay method involving probes with specific binding domains and polynucleotides, where hybridization and extension steps are controlled to reduce false positives, using techniques like blocking oligonucleotides and magnetic separation to purify antibody-target protein complexes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both detection antibodies are present contemporaneously in solution, then the assay can detect multiple targets, but antibody cross-hybridization occurs in the absence of analyte, increasing false positive signals
Solution Approach 1:
The assay divides the detection process into separate sequential steps: first capturing one target with its antibody, then adding a second antibody for the second target. This temporal segmentation prevents simultaneous antibody interactions that cause cross-hybridization, while still enabling multiplexed detection of multiple analytes through sequential probe additions.
Solution Approach 2:
The method performs preliminary capture of the first target-analyte complex with the first antibody and immobilization on beads before introducing the second antibody. This preliminary action ensures that the first binding event is established and stabilized, reducing the likelihood of cross-hybridization when the second antibody is added, thereby maintaining reliability in multiplexed assays.
2Ease of operation
If target binding, extension, and amplification reactions occur in solution, then the assay is simple to perform, but the immunoassay and molecular biology steps are sensitive to matrix components, increasing false positives
Solution Approach 1:
Magnetic beads serve as an intermediary solid phase support that immobilizes the antibody-target complexes during the assay. This solid-phase intermediate separates the immunoassay steps from the subsequent molecular biology steps, reducing sensitivity to matrix components in solution while maintaining assay simplicity through standardized bead-based protocols.
Solution Approach 2:
The method replaces solution-phase chemical reactions with solid-phase immobilized reactions on magnetic beads. This mechanical substitution allows for easy separation and washing of complexes, reducing interference from matrix components while maintaining operational simplicity through magnetic separation techniques.
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 significantly reduces noise and false positives, enhancing the accuracy of proteomic assays, enabling early disease detection and improved diagnosis of complex diseases, and facilitating therapeutic interventions.
Implementation Method 1
incubating the second complex under conditions to allow for hybridization of the polynucleotide of the first probe to the polynucleotide of the second probe
Implementation Method 2
extending the hybridized polynucleotides of the first and second probes to generate complementary strands of the polynucleotides of the first and second probes
Implementation Method 3
contacting the first complex with a capture molecule, wherein the capture molecule binds to the ligand of the first probe of the first complex
Data Source
AI summary
Disclosed are methods for multiplexed protein detection, including, for example, a multiplex immunoassay capable of eliminating or reducing false positives in proximity probe-based assays. The disclosure also provides methods for reducing noise due to probe and oligo cross-reactivity. Additional methods to integrate protein readouts with mulitiomics datasets and related systems and computer-readable media are also provided.