Microfluidic Cell Capture and DNA Entanglement Under Flow
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Solution Overview
Problem
Existing cancer treatment methods face challenges in detecting and monitoring genetic mutations due to the limited availability and loss of genetic material during sample preparation, necessitating improved technologies for capturing and analyzing genomic DNA from cancer cells.
Innovation Solution
A microfluidic device integrating aptamer-based cell capture and nucleic acid entanglement arrays for capturing cancer cells and isolating genomic DNA, allowing for on-chip analysis and multiple displacement amplification of specific genes for sequencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional bulk solution sample preparation is used, then genetic material can be accessed, but significant sample loss occurs and genetic material is consumed quickly
Solution Approach 1:
The patent replaces traditional bulk solution biochemical processing with a microfluidic device that uses physical entanglement of genomic DNA on micropillar arrays. This mechanical/physical approach allows the DNA to be captured and retained without consumption, enabling repeated use of the same genetic material for multiple amplification reactions.
Solution Approach 2:
The micropillar array structure provides self-retention of genomic DNA through physical entanglement. The DNA strands become naturally entangled in the micropillar mesh as they flow through the device, eliminating the need for additional capture reagents or complex purification steps that would consume sample.
2Adaptability or versatility
If multiple amplification reactions are performed on the same genomic DNA template, then comprehensive genetic analysis is enabled, but contamination risk increases
Solution Approach 1:
The microfluidic device is segmented into distinct functional zones: a capture region where genomic DNA is entangled on micropillars, and separate reaction chambers for multiple amplification reactions. This spatial segmentation allows multiple reactions to occur simultaneously or sequentially on the same DNA template while maintaining physical separation that prevents cross-contamination.
Solution Approach 2:
The micropillar array acts as an intermediary platform that holds the genomic DNA template in a fixed, accessible position. Reagents for different amplification reactions can be introduced separately through the device, and the micropillars mediate the interaction between the DNA template and various reagents without requiring direct mixing of all reagents together, thus preventing contamination.
3Adaptability or versatility
If genomic DNA is isolated and maintained for sequential analysis, then comprehensive genetic profiling is achieved, but device complexity increases
Solution Approach 1:
The micropillar array serves multiple functions: it captures genomic DNA through physical entanglement, retains the DNA for sequential amplification reactions, and facilitates product elution. This multi-functionality reduces the need for separate components for each step of the genetic analysis workflow, thereby limiting the increase in overall device complexity despite the enhanced analytical capabilities.
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
Enables timely and cost-effective identification of genetic mutations, facilitating personalized treatment strategies by maintaining genomic DNA for sequential amplification and analysis within a single device, reducing contamination risks.
Implementation Method 1
Aptamers are short single-stranded nucleic acids with structures determined by their specific nucleotide sequence. These molecules bind with high affinity and specificity to their intended targets.
Implementation Method 2
This device incorporated a fine micropillar array that captured megabase-long genomic DNA (gDNA) strands via physical entanglement.
Data Source
AI summary
The present invention relates to, inter alia, a microfluidic device for capturing target cells and analyzing genomic DNA isolated from the target cells while under flow conditions. The microfluidic device includes a cell microchannel and a nucleic acid microchannel that intersect in an orthogonal manner, thereby forming a cell capture intersection region. The microfluidic device also includes a cell capture array and a nucleic acid entanglement array. The cell capture array includes a plurality of cell capturing micropillars and is located in the cell capture intersection region. The nucleic acid entanglement array includes a plurality of nucleic acid entanglement micropillars that function to physically entangle and maintain thereon genomic DNA isolated from the one or more target cell, and is located in a portion of the nucleic acid microchannel that is adjacent to and downstream of the cell capture intersection region. Methods of using the microfluidic device are also disclosed.