Encoded Particles for Digital Nucleic Acid Amplification
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Solution Overview
Problem
Conventional biological assays face limitations in sensitivity, accuracy, and complexity due to analog measurements, and existing amplification methods like PCR require calibration and are affected by cross-talk between reactions, limiting the efficiency and reliability of molecular analysis.
Innovation Solution
The use of compartmentalized volumes with encoded particles and probes allows for digital analysis, enabling improved speed, accuracy, and reproducibility by amplifying target molecules and modulating detectable signals within these volumes, thereby enhancing the detection of target molecules' presence, identity, or concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PCR amplification is used, then target molecules can be detected, but cross-talk between reactions occurs and calibration is required
Solution Approach 1:
The reaction system is divided into many small compartmentalized volumes (droplets or wells), each performing independent amplification reactions. This segmentation physically isolates reactions to eliminate cross-talk while enabling digital counting of positive compartments for absolute quantification without calibration curves.
Solution Approach 2:
The invention extracts the need for calibration standards by using digital counting of positive compartmentalized volumes. Instead of requiring external calibration curves, the system directly counts the number of positive compartments to determine target concentration, eliminating the calibration step entirely.
2Measurement precision
If analog measurement methods are used, then target molecules can be measured, but sensitivity and accuracy are limited
Solution Approach 1:
The invention replaces analog continuous measurement systems with digital binary measurement systems. Each compartmentalized volume provides a binary positive/negative signal, and the number of positive compartments is counted digitally. This substitution of analog for digital measurement fundamentally improves precision and eliminates the need for complex calibration procedures.
3Productivity
If traditional digital analysis methods are used, then target molecules can be analyzed, but speed and dynamic range are limited
Solution Approach 1:
By segmenting the sample into many parallel compartmentalized volumes, the system achieves high-throughput parallel processing. Multiple target molecules are analyzed simultaneously in different compartments, dramatically increasing analysis speed while maintaining digital counting accuracy for precise quantification across wide dynamic ranges.
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 increases the speed, dynamic range, and reproducibility of molecular-level interrogation, allowing for the analysis of multiple target molecules in a single assay with improved computational efficiency and reduced cross-talk between reactions.
Implementation Method 1
detecting an optically detectable code emitted by an encoded particle in the compartmentalized volume, wherein the detection of the optically detectable code indicates that the target molecule is present in the compartmentalized volume
Implementation Method 2
each probe comprises an encoded particle and a binding region capable of binding to a target molecule or to a molecule that is correlated with the presence of the target molecule
Implementation Method 3
amplifying the target molecule in a compartmentalized volume that is correlated with the presence of the target molecule
Data Source
AI summary
Methods, devices, and systems for performing digital assays are provided. In certain aspects, the methods, devices, and systems can be used for the detection of nucleic acids and proteins. Also provided are methods, devices, systems, and compositions for improved detection and quantification of target molecules using encoded probes. In certain aspects, the methods, devices, and systems provided herein are useful in multiplexed digital assays. In certain aspects, the methods, devices, and systems can be used for the recognition, detection, and sizing of compartmentalized volumes in a volume. Also provided are compositions and kits suitable for use with the methods and devices of the present disclosure.