Partition-Free Digital PCR Using Optical Spot Quantification
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Solution Overview
Problem
Current digital PCR (dPCR) systems require physical partitioning of samples into droplets or wells, necessitating complex microfluidic circuitry and detection systems, which are inefficient and difficult to implement in clinical settings.
Innovation Solution
A partition-free digital PCR method that distributes nucleic acids across a chamber without physical barriers, using thermal control and optical detection to analyze fluorescence distribution for quantification, eliminating the need for physical partitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical partitioning is used to achieve digital PCR, then digital quantification accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes the physical partitioning component from the dPCR system. Instead of using microfluidic droplets or physical wells to separate reactions, the invention performs PCR amplification in a single unified chamber and achieves digital quantification through spatial resolution of individual amplification events via high-resolution imaging, eliminating the need for complex microfluidic partitioning circuitry
Solution Approach 2:
The patent replaces the mechanical physical partitioning system with an optical detection system. Rather than using physical barriers or droplet generation mechanics to create partitions, the invention uses high-resolution cameras and image processing to resolve and count individual amplification events spatially within a single chamber, substituting mechanical complexity with optical detection capability
2Reliability
If physical partitioning with multiple instruments is used, then digital PCR functionality is achieved, but productivity decreases
Solution Approach 1:
The patent merges multiple separate instruments and steps into a single integrated system. Instead of requiring separate droplet generation devices, multiple PCR chambers, and complex fluid handling systems, the invention combines PCR amplification and digital detection into a single chamber with integrated imaging capability, allowing one instrument to perform functions that previously required multiple devices
Solution Approach 2:
The patent performs preliminary distribution of template DNA across the chamber bottom before PCR amplification begins. This pre-distribution step ensures that individual DNA molecules are spatially separated at the start of amplification, allowing each molecule to generate a distinct, resolvable amplification signal without requiring physical partitions during the amplification process itself
3Measurement precision
If sophisticated detection systems are used to count positive reactions, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent creates a spatial map or image copy of the chamber contents at each PCR cycle. By capturing images of the chamber and tracking the spatial positions and intensities of individual amplification events across multiple cycles, the system achieves precise detection and counting of positive reactions through image analysis rather than requiring complex real-time single-molecule detection hardware
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
Enables efficient and simplified digital PCR processes with reduced setup complexity and time, suitable for clinical applications by leveraging diffusion control and optical imaging to quantify nucleic acids.
Implementation Method 1
performing amplification of the one or more nucleic acids
Implementation Method 2
performing amplification of the one or more nucleic acids
Implementation Method 3
obtaining one or more images of the amplified nucleic acids; and digitally quantifying the amplified nucleic acids based on fluorescence distribution across the chamber
Data Source
AI summary
The present disclosure relates to methods and systems for partition-free quantification of molecules. The methods and systems provided allow a sample to be amplified such that discrete amplification spots can be analyzed to quantify the number of molecules without requiring physical partitions in order to separate the amplification spots.