Multiplexed Digital Assays Using Color Combinatorics
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Solution Overview
Problem
Current multiplexed detection and quantitation technologies are limited by the number of targets that can be simultaneously detected, the accuracy of differential detection, and the complexity of instrumentation, particularly in 3D partitioning systems and high-partition regimes, leading to reduced precision and increased costs.
Innovation Solution
The use of color combinatorics, stimulus-responsive probes, tandem probes, and conjugated polymer probes enables the detection of a large number of targets with high accuracy and efficiency in a digital assay, utilizing a high number of partitions to achieve low occupancy and minimize signal overlap, thereby expanding the dynamic range and reducing background noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional PCR multiplexing reactions use one probe per target conjugated with dyes of different excitation and emission spectra, then targets can be differentiated, but the system is restricted to detecting only as many targets as there are available emission spectra
Solution Approach 1:
The patent transitions from spectral dimension multiplexing (using different emission spectra) to spatial dimension multiplexing by implementing digital partitioning of the sample into thousands of individual reaction chambers. Each partition can detect multiple targets simultaneously, effectively adding a spatial dimension to the detection capability and allowing far more targets to be analyzed than the number of available fluorophore spectra.
Solution Approach 2:
The patent divides the sample into a large number of discrete partitions (e.g., 10,000+ individual reaction chambers), where each partition contains a subset of targets. This segmentation allows parallel detection of multiple targets across many partitions, dramatically increasing the total number of targets that can be detected beyond the limitation of available dye spectra.
2Adaptability or versatility
If partition-based systems use a high number of partitions to increase multiplexing capability, then more targets can be detected, but signal overlap and background noise increase, reducing measurement precision
Solution Approach 1:
The patent applies local quality by ensuring that each individual partition maintains optimal signal-to-noise characteristics through controlled target distribution and localized detection. By analyzing many such high-quality individual partitions and aggregating the data, the system achieves both high multiplexing capability and maintained measurement precision.
Solution Approach 2:
The patent creates thousands of identical copies (partitions) of the detection system, each independently measuring target presence. By aggregating data from many such copies, the system achieves high multiplexing while maintaining precision through statistical averaging that reduces the impact of signal overlap and background noise in any single partition.
3Quantity of substance
If digital PCR systems implement 3D partition formats to increase partition density, then more partitions can be accommodated, but the complexity of the apparatus and operation increases
Solution Approach 1:
The patent replaces complex mechanical 3D partitioning systems with a simplified approach using 2D arrays of microchambers or droplets that can be easily imaged and analyzed by standard microscopy or imaging systems. This substitution maintains high partition density while dramatically reducing apparatus and operational complexity.
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 allows for the detection of over 100 targets in a single assay run with improved signal-to-noise ratios and reduced background noise, achieving a dynamic range of several orders of magnitude and enabling efficient multiplexed analyses with less complex instrumentation.
Implementation Method 1
Each fluorophore has an associated excitation spectrum and an associated emission spectrum... detecting light emitted by the set of fluorophores
Data Source
AI summary
The disclosure provides compositions, methods, and systems for implementation of highly multiplexed molecular diagnostic assays involving color combinatorics, stimulus-responsive probes, tandem probes, conjugated polymer probes, and other mechanisms for increasing the number of targets that can be simultaneously detected in a digital assay. Multiplexed detection of targets is achieved in a rapid manner, with respect to sample partitioning and target detection using multiple color channels for detection. Implementation of methods described also achieve detection with significantly improved signal-to-noise ratio (SNR) values.