Multiplexed Assay Array with Capture Agent Gradient
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Solution Overview
Problem
Current multiplexed assay technologies face limitations in the number of tests that can be simultaneously analyzed, precision, reproducibility, and dynamic range due to varying concentrations and biochemical properties of targets, leading to underrepresentation of analytes and reduced analytical performance.
Innovation Solution
A composition with a set of detection units on a substrate, where each unit contains a discrete amount of capture agent forming a concentration gradient, allowing for precise measurement of analyte abundance through aggregation of data from individual units, and a method involving binding detection and computational analysis to quantify analyte presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-density affinity capturing is used to increase the number of targets analyzed simultaneously, then the number of tests analyzed increases, but the dynamic range of target detection is limited due to small contact surface area
Solution Approach 1:
The assay system is segmented into multiple independent detection units (microreactors), each containing a specific affinity capturing agent. This segmentation allows each unit to independently capture and detect target analytes, with signals that can be aggregated to achieve both high multiplexing capacity and extended dynamic range through the combined readout of multiple units per analyte type.
Solution Approach 2:
The invention transitions from traditional single-reaction-well formats to a multi-dimensional array architecture where detection units are arranged in spatial dimensions (e.g., microplates with multiple wells, microarrays). This dimensional expansion allows simultaneous analysis of numerous targets while maintaining sufficient signal intensity in each unit through optimized well volumes and capture agent densities.
2Productivity
If high-density microarrays are used to profile tens of thousands of targets, then the number of targets profiled increases, but analytical performance is reduced due to variability in coupling and processing
Solution Approach 1:
Affinity capturing agents are pre-immobilized on solid support surfaces in defined locations with controlled orientations and densities before sample application. This preliminary positioning ensures consistent coupling conditions across all detection units, reducing variability in target capture efficiency and improving reproducibility of analytical results.
Solution Approach 2:
The invention optimizes parameters such as capture agent density, orientation, and immobilization chemistry to maintain uniform binding characteristics across all detection units. By controlling these parameters during array fabrication, the system achieves consistent analytical performance across tens of thousands of targets despite the high-density format.
3Adaptability or versatility
If varying concentrations of capture agents are used to accommodate different target abundances, then the applicability to diverse targets improves, but the complexity of providing appropriate capturing conditions for all analytes increases
Solution Approach 1:
Each detection unit in the array is assigned specific local properties, including tailored concentrations of affinity capturing agents optimized for the abundance and binding characteristics of its target analyte. This local customization allows each unit to operate at optimal conditions for its specific target while maintaining a unified overall assay platform.
Solution Approach 2:
The invention employs a universal assay platform architecture where all detection units share common processing conditions, detection methodologies, and data analysis approaches. This universality allows the system to handle diverse targets with varying requirements through localized parameter adjustments while maintaining operational simplicity through standardized protocols.
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 solution enhances precision and reproducibility, expands the dynamic range of analyte detection, and improves analytical performance by aggregating data from replicates with varying capture agent concentrations, making it suitable for clinical laboratory tests.
Implementation Method 1
each detection unit contains a discrete amount of a capture agent that specifically binds the target analyte
Data Source
AI summary
The invention features compositions and methods that are useful for precisely determining the amount of one or more analytes present in a sample. In one aspect, the invention provides a composition for measuring the abundance of one or more target analytes in a sample, where the composition contains a set of detection units for each analyte fixed to a substrate (e.g., a membrane, bead, filter, chip, polymer-based film or glass slide, or other printable surface), where each detection unit contains a discrete amount of a capture agent that specifically binds the target analyte, and the amount of capturing agent varies over the set to form a concentration gradient.