Droplet PCR Multiplexing Through Single-Channel Signal Intensity Coding
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Solution Overview
Problem
Current droplet digital PCR (ddPCR) technologies are limited to measuring two targets in a single reaction using two distinct color channels, restricting the number of nucleic acid targets that can be detected in a single optical channel.
Innovation Solution
The method involves partitioning multiple nucleic acid targets and probes into droplets, amplifying them, and generating unique signals in a single optical channel by using nucleic acid probes at varying concentrations or intensity levels, allowing for the detection of three or more targets by distinguishing their unique signal readouts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two distinct color channels are used for detection, then the number of targets that can be measured in a single reaction is limited to two, but using a single optical channel enables detection of three or more targets
Solution Approach 1:
The patent changes the detection parameter from using multiple color channels to using a single optical channel with varying probe concentrations. By adjusting the concentration of probes (first probe at concentration X, second probe at at least 2X, third probe at at least 4X), the system can distinguish between multiple targets using signal intensity variations rather than relying on multiple color channels, thereby increasing the number of measurable targets while simplifying the optical detection system.
2Adaptability or versatility
If multiple nucleic acid probes at varying concentrations are used in a single optical channel, then three or more targets can be detected, but the signal differentiation between targets becomes more complex
Solution Approach 1:
The patent applies local quality by assigning different concentration levels to different probes within the same optical channel. The first nucleic acid probe is used at concentration X, the second at at least 2X, and the third at at least 4X. This creates locally differentiated signal intensities that correspond to different targets, allowing the system to distinguish between multiple targets based on the intensity level of the signal generated by each probe, thereby enabling detection of three or more targets with a single optical channel.
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 enables the detection of multiple nucleic acid targets in a single optical channel, significantly increasing the number of measurable targets beyond the limitations of existing technologies, with the potential to identify any combination of targets through distinct signal intensities or color combinations.
Implementation Method 1
each of the set of nucleic acid probes comprises a different fluorophore
Data Source
AI summary
The present disclosure provides methods and compositions for detection of multiple nucleic acid targets in a single optical channel in a digital assay. In some cases, three or more nucleic acid targets may be detected in a single channel. Nucleic acid targets may be partitioned, amplified, used to generate signals, where each signal corresponds to a unique combination of nucleic acid targets in a partition.