Microfluidic Isotachophoresis for FFPE Nucleic Acid Purification
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Solution Overview
Problem
Existing methods for nucleic acid extraction and purification from formalin-fixed paraffin-embedded (FFPE) samples are labor-intensive, difficult to automate, and result in low yield and quality due to cross-linked proteins binding DNA and RNA, leading to failed downstream assays.
Innovation Solution
The use of isotachophoresis (ITP) in microfluidic devices for sample preparation, including deparaffinization, lysing, and de-crosslinking, to selectively focus and purify nucleic acids, enhancing yield and quality by applying electric fields with leading and trailing electrolytes of varying mobilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If traditional manual methods are used for nucleic acid extraction from FFPE samples, then the process can be completed, but the procedure is labor-intensive and difficult to automate
Solution Approach 1:
The patent replaces manual mechanical operations (pipetting, vortexing, centrifugation) with an automated system that uses electric fields for isotachophoresis. The microfluidic device automates nucleic acid purification by applying voltage to drive separation, eliminating the need for manual manipulation of samples through multiple extraction steps.
Solution Approach 2:
The invention changes the fundamental operating parameters from manual liquid handling to electric field-driven separation. By using isotachophoresis with controlled voltage and electrolyte concentrations, the system achieves automated purification based on electrophoretic mobility differences, transforming the extraction process into an electrically controlled operation.
2Productivity
If cross-link reduction and enzyme treatment are applied to FFPE samples, then nucleic acids can be released, but the process requires additional time and effort
Solution Approach 1:
The patent combines deparaffinization, protein crosslink reduction, and nucleic acid purification into a single integrated isotachophoresis step. The electric field-driven separation simultaneously achieves all these functions in one continuous process, eliminating the sequential time-consuming steps of traditional methods.
Solution Approach 2:
The isotachophoresis process operates continuously under applied voltage, maintaining constant separation force throughout the purification. This continuous electric field application replaces discontinuous manual steps (incubation, washing, elution) with a single uninterrupted separation process, significantly reducing total processing time.
3Quantity of substance
If ITP is used for nucleic acid purification, then high-yield and rapid purification is achieved, but specialized equipment and electrolyte buffers are required
Solution Approach 1:
The patent segments the nucleic acid purification process into distinct electrophoretic zones within the microfluidic device. By creating separate leading and trailing electrolyte regions with different mobilities, the system achieves focused concentration of nucleic acids at the interface, enabling high-yield purification through spatial segmentation of the separation process.
Solution Approach 2:
The isotachophoresis device serves multiple functions simultaneously: it acts as a deparaffinization chamber, protein digestion reactor, and nucleic acid purification system all in one apparatus. The single microfluidic device performs what traditionally required multiple separate instruments and protocols, reducing overall equipment complexity despite the specialized ITP functionality.
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
ITP enables rapid, automated, and high-yield purification of nucleic acids from FFPE samples, reducing manual labor and improving assay performance by concentrating non-crosslinked nucleic acids, suitable for various biological samples.
Implementation Method 1
Isotachophoresis (ITP) is an electrophoretic technique which can use a discontinuous buffer containing a leading electrolyte (LE) with a higher effective mobility magnitude and a trailing electrolyte (TE) with a lower effective mobility magnitude
Implementation Method 2
ITP can selectively focus nucleic acids from samples by more than 10,000-fold in less than five minutes
Data Source
AI summary
The present disclosure relates to fluidic systems and devices for processing, extracting, or purifying one or more analytes. These systems and devices can be used for processing samples and extracting nucleic acids, for example by isotachophoresis. In particular, the systems and related methods can allow for extraction of nucleic acids, including non-crosslinked nucleic acids, from samples such as tissue or cells. The systems and devices can also be used for multiplex parallel sample processing.