Isotachophoresis Buffer Design for FFPE Nucleic Acid Purification
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Solution Overview
Problem
Sample preparation methods for extracting and purifying nucleic acids from formalin-fixed paraffin-embedded (FFPE) samples are labor-intensive and difficult to automate, leading to low yield and quality issues for downstream applications like amplification and sequencing.
Innovation Solution
Utilizing isotachophoresis (ITP) with a discontinuous buffer system to selectively focus and purify nucleic acids, automating the process through microfluidic devices for efficient extraction and purification of nucleic acids from various biological samples, including FFPE samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If traditional manual methods are used for FFPE sample preparation, then flexibility and adaptability are maintained, but labor intensity increases and automation becomes difficult
Solution Approach 1:
The patent replaces manual mechanical operations with an automated microfluidic system that uses electric fields to drive sample processing. The isotachophoresis device automatically performs separation, purification, and concentration of nucleic acids without manual intervention, resolving the contradiction between automation and operational ease.
Solution Approach 2:
The microfluidic device integrates multiple functions (deparaffinization, protein digestion, nucleic acid extraction, separation, and concentration) into a single automated platform. This multi-functional system eliminates the need for multiple manual steps while maintaining ease of operation through unified control.
2Productivity
If multiple manual steps are performed for nucleic acid extraction from FFPE samples, then thorough processing is achieved, but processing time increases significantly
Solution Approach 1:
The patent merges multiple sequential manual steps (deparaffinization, protein digestion, nucleic acid extraction, and purification) into a single integrated microfluidic device. The device performs all operations simultaneously or in continuous flow, dramatically reducing total processing time while maintaining thoroughness.
Solution Approach 2:
The isotachophoresis process enables continuous processing of samples through the microfluidic device. Samples flow continuously through different functional zones, eliminating idle time between steps and maintaining constant productive action throughout the extraction and purification process.
3Reliability
If conventional extraction methods are used, then all nucleic acid material is recovered, but non-crosslinked material contamination reduces downstream assay quality
Solution Approach 1:
The isotachophoresis device selectively extracts and separates non-crosslinked nucleic acid material from the sample matrix. By using discontinuous buffer systems and electric field-driven migration, the device isolates pure nucleic acids while leaving behind contaminants, achieving both high quality and adequate yield.
Solution Approach 2:
The patent applies local quality differentiation by creating distinct buffer zones within the microfluidic device. The leading electrolyte and trailing electrolyte have different properties that create selective environments for different types of nucleic acid material, enabling separation of crosslinked from non-crosslinked species based on their local migrational behavior.
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
Achieves faster, less labor-intensive, and higher-yield nucleic acid purification, suitable for both small and large starting amounts, with improved quality for genomic analysis.
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.