Mesofluidic Device for Intact DNA Concentration
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Solution Overview
Problem
Current methods for concentrating large DNA molecules are inefficient and often result in DNA breakage during routine molecular biology manipulations, making it difficult to analyze structural variations in genomes, particularly for applications like Nanocoding that require intact and fully stretched DNA molecules.
Innovation Solution
The development of mesofluidic devices with specific geometries and materials, such as poly-acrylamide gel roadblocks, that use electrical voltage to elute and concentrate DNA molecules, ensuring they remain intact and fully stretched for analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If large DNA molecules are handled during routine molecular biology manipulations, then DNA can be isolated and prepared for analysis, but the DNA molecules break due to their fragility
Solution Approach 1:
The device segments the handling process into distinct functional zones: an insert region for gentle loading, an elongated channel for controlled migration, and a concentration region for final collection. This segmentation allows each region to be optimized for its specific function, minimizing mechanical stress on DNA molecules throughout the process.
Solution Approach 2:
The patent introduces an intermediary gel matrix as a gentle medium for DNA migration. The gel acts as a mediator between the DNA molecules and the external environment, providing a protective matrix that reduces mechanical stress while allowing controlled movement through the device channels.
2Quantity of substance
If DNA molecules are eluted from inserts into solution, then concentration can be achieved, but DNA breakage occurs during the elution process
Solution Approach 1:
The patent replaces mechanical manipulation methods with electrical field-driven migration. Instead of using physical forces that could shear fragile DNA, the system uses electrophoretic migration to transport DNA from inserts through the gel matrix into the solution phase, achieving concentration without mechanical stress.
Solution Approach 2:
The device changes the physical state and environment parameters during elution: DNA migrates through a gel matrix under controlled electrical fields, transitioning from a protected insert environment to a concentrated solution phase. The gel concentration and electrical field strength are optimized to maintain DNA integrity throughout the parameter transition.
3Measurement precision
If DNA molecules are stretched uniformly for Nanocoding analysis, then structural variations can be detected, but very low ionic strength solutions are required which complicates the process
Solution Approach 1:
The elongated channel serves multiple functions: it provides a controlled environment for DNA migration, maintains the necessary low ionic strength conditions for stretching, and facilitates concentration in the adjacent region. This multi-functionality reduces the need for separate preparation steps and complex solution handling.
Solution Approach 2:
The device structure itself maintains the low ionic strength environment needed for DNA stretching. The elongated channel geometry and gel matrix configuration create self-containing zones that preserve the required solution conditions without requiring continuous external intervention or complex preparation protocols.
4Productivity
If conventional concentration methods are used for large DNA, then small DNA can be concentrated efficiently, but large DNA molecules are lost or broken
Solution Approach 1:
The concentration region is designed with local quality optimized for large DNA molecules. The gel matrix concentration and channel geometry in this specific zone are tailored to capture and concentrate large DNA molecules that have migrated from the insert, providing high recovery efficiency specifically for the size range needed for structural variation analysis.
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
The mesofluidic devices effectively elute and concentrate DNA molecules, with up to 84% elution and 45% recovery in solution, maintaining the DNA's full length, which is crucial for whole-genome analysis and sequencing platforms like Nanocoding.
Implementation Method 1
fluorescently labelled DNA with sequence-specific information highlighted with fluorescently labelled nucleotides are driven into nanoslits with an electric field
Implementation Method 2
allows DNA to be uniformly stretched at specific locations within the device (nanoslits)
Data Source
AI summary
This disclosure relates to mesofluidic devices and methods for eluting and concentrating a plurality of nucleic acid molecules. The mesofluidic device includes a device frame having a bottom surface upon which is defined a first reservoir and the second reservoir. The first reservoir includes a first electrode, and the second reservoir includes a second electrode. The first and second electrodes are configured for electrical connection. The mesofluidic device includes an elongated channel extending between the first reservoir and the second reservoir. The mesofluidic device includes a first slot having a first slot width. The first slot is configured to receive an insert. The first slot intersects the elongated channel. The mesofluidic device includes a second slot having a second slot width. The second slot is configured to receive a separation material having a first porosity. The second slot intersects the elongated channel.