Nucleic Acid Droplet Tagging for High-Throughput Microfluidics
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Solution Overview
Problem
Existing microfluidic systems face challenges in accurately tracking and distinguishing large numbers of droplets, especially when they are produced at high rates or exposed to various conditions, making it difficult to determine their individual histories and properties.
Innovation Solution
The method involves exposing droplets to different conditions and adding nucleic acids that encode these conditions, allowing for the ligation and sequencing of these acids to determine the droplet's history, even if droplets are mixed together, enabling the sorting and analysis of droplets based on their exposure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If droplets are produced at high rates to increase productivity, then the throughput of the microfluidic system is improved, but the ability to accurately track and distinguish individual droplets deteriorates
Solution Approach 1:
The tracking information for each droplet is segmented into discrete nucleic acid tags that are added sequentially as the droplet passes through different zones. Each tag represents a specific measurement or condition, allowing high-throughput processing while maintaining individual droplet identification through the unique sequence of tags accumulated in each droplet.
2Productivity
If multiple droplets are processed simultaneously to increase throughput, then productivity is improved, but the complexity of tracking and distinguishing individual droplet histories increases
Solution Approach 1:
Nucleic acid tags serve as intermediary carriers of droplet history information. Instead of using complex electronic tracking systems to monitor each droplet individually, the patent uses biological molecules (nucleic acids) as passive tags that accumulate in each droplet, simplifying the tracking mechanism while enabling parallel processing of multiple droplets.
3Loss of information
If traditional tagging methods are used to identify droplets, then droplet identification is possible, but information about the complete droplet history and conditions is lost when droplets are combined
Solution Approach 1:
Multiple nucleic acid tags representing different droplet conditions and measurements are merged into a single continuous nucleic acid sequence through ligation. This allows the complete history of each droplet to be preserved and read sequentially, even when multiple droplets are processed together, as each droplet's tag sequence remains distinct and identifiable.
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 allows for the accurate determination of the conditions each droplet was exposed to, even after they are combined, maintaining information about their history and enabling complex condition analysis without loss of data, which is not possible with separate tagging methods.
Implementation Method 1
adding a first nucleic acid to the droplet, wherein the first nucleic acid encodes the first condition; exposing the droplet to a second condition and adding a second nucleic acid to the droplet, wherein the second nucleic acid encodes the second condition
Implementation Method 2
ligating the first nucleic acid and the second nucleic acid together
Data Source
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AI summary
The present invention generally relates to microfluidic devices, including systems and methods for tagging droplets within such devices. In some aspects, microfluidic droplets are manipulated by exposing the droplets (or other discrete entities) to a variety of different conditions. By incorporating into the droplets a plurality of nucleic acid "tags," and optionally ligating then nucleic acids together, the conditions that a droplet was exposed to may be encoded by the nucleic acid tags. Thus, even if droplets exposed to different conditions are mixed together, the conditions that each droplet encountered may still be determined, for example, by sequencing the nucleic acids.