Multiplexed Molecular Detection Using Partitioned Color Combinatorics
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Solution Overview
Problem
Existing multiplexed detection and quantitation technologies are limited by the number of partitions, partition formats, color availability for analysis, high apparatus costs, and signal overlap, leading to reduced precision and accuracy in detecting multiple targets.
Innovation Solution
The use of high-partition, low-occupancy systems with color combinatorics, stimulus-responsive probes, and tandem probes to enable the simultaneous detection of a large number of targets, achieving low doublet/triplet occupancy and improved signal-to-noise ratios, allowing for high dynamic range and accurate quantitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional PCR multiplexing reactions use one probe per target conjugated with dyes of different excitation and emission spectra, then multiple targets can be detected, but the system is limited by the number of colors available for detection and signal overlap occurs
Solution Approach 1:
The patent segments the detection space by dividing the sample into many individual partitions (droplets or wells), where each partition contains at most one target molecule. This segmentation eliminates signal overlap between targets and enables precise quantitation by counting positive partitions, resolving the contradiction between detecting multiple targets and maintaining measurement precision.
Solution Approach 2:
The patent transitions from detecting multiple targets in a single bulk reaction (one-dimensional detection) to distributing targets across many partitions (adding the dimension of partition index). This dimensional expansion allows unique identification of each target through its partition location, enabling high-precision quantitation of multiple targets simultaneously.
2Measurement precision
If partition-based systems use a high number of partitions, then digital quantitation precision improves, but apparatus costs and device complexity increase
Solution Approach 1:
The patent uses digital imaging to create optical copies of the partition array, allowing the detection system to read the entire high-partition array without physically moving or manipulating each partition individually. This copying approach enables high-precision quantitation across many partitions while avoiding the complexity of mechanical handling systems.
Solution Approach 2:
The patent replaces complex mechanical partition handling and sorting systems with a static partition array that is read by digital imaging. This substitution eliminates the need for mechanical manipulators, robotic systems, or complex fluid handling equipment, reducing device complexity while maintaining high partition numbers for precise quantitation.
3Adaptability or versatility
If amplitude-based multiplexing is used to differentiate targets, then unique endpoints can be achieved, but signal overlap occurs and precision is reduced
Solution Approach 1:
The patent segments the detection problem by assigning each target to a specific partition rather than relying on amplitude differentiation in a bulk reaction. This segmentation allows unique identification of each target through its partition location, eliminating signal overlap and improving precision while maintaining high multiplexing capability.
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.