Dual-Marker Biological Sample Analysis Reducing Cross-Reactivity
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Solution Overview
Problem
Existing methods for analyzing biological samples with affinity reagents, such as antibodies, often suffer from cross-reactivity issues, leading to false-positive results and reduced reliability, especially in high-throughput assays, due to the moderate affinity of these reagents towards multiple targets.
Innovation Solution
A method involving the use of two specific markers, each binding to different parts of a target analyte, to determine its presence with high specificity, reducing the risk of cross-reactivity by employing aptamers and antibody fragments that are optically distinguishable and can be removed for cyclical staining and imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single affinity reagent (antibody) is used to detect a target analyte, then the assay can be performed with a simple protocol, but cross-reactivity with OFF-targets occurs leading to false-positive results
Solution Approach 1:
The patent divides the detection task into multiple independent detection events using different affinity reagents (primary and secondary antibodies) that recognize different epitopes of the same target analyte. This segmentation allows cross-reactivity of individual reagents to be identified and filtered out, as true positive signals will be detected by multiple reagents while false positives will show inconsistent patterns
Solution Approach 2:
The patent implements a feedback mechanism where the detection results from multiple affinity reagents are compared and analyzed together. The system uses the collective information from multiple detection events to validate true positives and eliminate false positives, creating a self-correcting detection system that improves reliability without significantly complicating the overall assay protocol
2Adaptability or versatility
If multiple affinity reagents are used to detect different target analytes in high-plex assays, then comprehensive profiling is achieved, but cross-reactivity issues are amplified leading to reduced reliability
Solution Approach 1:
The patent applies segmentation by assigning multiple affinity reagents to each target analyte in the high-plex assay panel. Each target is detected through multiple independent detection channels, allowing the system to maintain comprehensive profiling capability while improving reliability through redundant verification of each analyte's presence
Solution Approach 2:
The patent creates a universal detection framework that works across all targets in the high-plex assay. The multi-reagent approach serves multiple functions simultaneously: detecting true positives, identifying cross-reactivity patterns, and providing validation across the entire assay panel, thereby improving reproducibility without sacrificing multiplexing capability
3Productivity
If rapid commercial antibody availability increases, then more targets can be detected, but validation protocols cannot keep pace leading to undetected cross-reactivity
Solution Approach 1:
The patent implements a self-service validation system where the assay itself generates the validation data through multi-reagent detection. Rather than requiring external validation protocols to catch cross-reactivity issues, the system uses the pattern recognition capability of multiple reagents to automatically identify and flag potential cross-reactivity problems, keeping pace with rapid antibody availability
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 significantly enhances the specificity and reliability of identifying target analytes in biological samples by using multiple affinity reagents that do not share the same cross-reactivity, allowing for precise localization and kinetic analysis, thereby improving data accuracy and reducing false positives.
Implementation Method 1
the first marker is configured to bind specifically to a first part of the at least one target analyte
Implementation Method 2
the second marker is configured to bind specifically to a second part of the at least one target analyte
Data Source
AI summary
A method for analysing a biological sample with at least one target analyte includes adding to the biological sample at least a first marker and a second marker. The first marker is configured to bind specifically to a first part of the at least one target analyte. The second marker is configured to bind specifically to a second part of the at least one target analyte. The method further includes determining a presence of the target analyte in the biological sample based on detecting the first marker and the second marker in the biological sample.