Droplet Barcode Labeling for Multiplex Digital PCR
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Solution Overview
Problem
Current genetic and proteomic analysis methods lack effective labeling techniques for nucleic acids and proteins, which are essential for sensitive and specific diagnostics and treatment development, particularly in sequencing applications.
Innovation Solution
The invention provides methods and materials for labeling target materials using fluid compartments, such as droplets, with barcode-type and probe-type labels, enabling techniques like sequencing, haplotyping, and multiplex digital-PCR by segregating and labeling nucleic acids and proteins in droplets, and merging them with unique N-mers for amplification and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional labeling techniques are used for nucleic acids and proteins, then the analysis can be performed, but the labeling effectiveness is insufficient for sensitive and specific diagnostics
Solution Approach 1:
The invention segments the labeling process into distinct barcode-type labels and probe-type labels, each serving specific functions. Barcode labels provide unique identifiers for tracking and quantification, while probe labels provide specific binding sequences for target recognition. This segmentation allows each label type to be optimized for its specific purpose, improving overall labeling effectiveness and detection sensitivity.
Solution Approach 2:
The invention introduces fluid compartments (droplets) as intermediary structures that contain both target materials and labels in isolated reaction spaces. These droplets serve as mediators that bring target molecules and labeling reagents together in controlled environments, enabling efficient and specific labeling while preventing interference from other sample components.
2Ease of manufacture
If target materials are labeled without fluid compartment segregation, then the labeling process is simpler, but cross-contamination and non-specific binding occur
Solution Approach 1:
The invention divides the sample into multiple fluid compartments (droplets), each containing a single target molecule or a limited number of molecules. This physical segmentation prevents cross-contamination between different targets and allows specific labeling reagents to be delivered to the correct compartment, maintaining both simplicity and precision.
Solution Approach 2:
Fluid compartments act as intermediary containers that isolate target materials from non-specific binding sites and other sample components. The droplets provide a controlled microenvironment where only the intended labels can access the targets, preventing non-specific binding while maintaining process simplicity through automated droplet generation.
3Productivity
If multiple targets are analyzed simultaneously without droplet isolation, then the analysis throughput increases, but signal interference and background noise increase
Solution Approach 1:
The invention segments multiple analysis reactions into separate droplets, each containing a specific target and its corresponding labels. This physical separation allows simultaneous analysis of multiple targets through parallel processing while preventing signal interference, as each droplet provides an isolated detection environment with minimal background noise.
Solution Approach 2:
Each fluid compartment provides a localized reaction environment with specific conditions optimized for its particular target. The droplets create local quality differences in terms of reagent concentration, pH, and ionic strength, allowing simultaneous analysis of multiple targets with different requirements without mutual interference.
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 enhances diagnostic and therapeutic outcomes by allowing precise labeling, amplification, and detection of nucleic acids and proteins, facilitating improved sequence read assembly and multiplex analysis in droplets, even in heterogeneous samples.
Implementation Method 1
The other reagents can be introduced into the fluid partitions containing the target material, for example, by merging droplets, resulting in the labeling of the target molecules (e.g., by hybridization of N-mers to target nucleic acids)
Data Source
AI summary
The invention provides barcode libraries and methods of making and using them including obtaining a plurality of nucleic acid constructs in which each construct comprises a unique N-mer and a functional N-mer and segregating the constructs into a fluid compartments such that each compartment contains one or more copies of a unique construct. The invention further provides methods for digital PCR and for use of barcode libraries in digital PCR.