Microelectroporation Device for High-Throughput Genomic Screening
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Solution Overview
Problem
Current high-throughput genome-wide RNAi screening technologies face challenges such as high reagent consumption, well-to-well variation, cross-contamination, and limited accessibility for BSL-4 biocontainment due to bulky equipment and space constraints, which hinder efficient viral infection studies.
Innovation Solution
A microelectroporation device with a high-density array of microchambers and biocompatible gaskets that minimizes reagent use, prevents cross-contamination, and allows for efficient cell trapping and distribution, utilizing a printed circuit board with discrete microelectrodes for precise electroporation and fluidic sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiwell plates are used for high-throughput RNAi screening, then screening throughput is improved, but reagent consumption increases and well-to-well variation occurs
Solution Approach 1:
The device segments the screening platform into numerous small microchambers (e.g., 1536 or more) on a single chip, each capable of holding minimal reagent volumes. This segmentation enables high-throughput screening while using nanoliter-scale reagent volumes per chamber, dramatically reducing total reagent consumption compared to traditional multiwell plates.
Solution Approach 2:
The invention transitions from the conventional multiwell plate format to a microfluidic chip-based two-dimensional array of microchambers. This dimensional change allows for higher density packing of screening sites while maintaining access to all chambers, thereby increasing throughput without proportionally increasing reagent usage.
2Productivity
If multiwell plates are used for high-throughput RNAi screening, then screening throughput is improved, but well-to-well variation increases
Solution Approach 1:
Each microchamber is independently segmented with precise micromachining, ensuring uniform dimensions and consistent fluid handling characteristics across all chambers. This segmentation eliminates the temperature gradients and evaporation issues present in multiwell plates, reducing well-to-well variation while maintaining high throughput.
Solution Approach 2:
The device employs microfluidic hydraulic control systems with integrated valves and channels that precisely deliver identical reagent volumes to each microchamber. This hydraulic precision ensures uniform cell seeding and reagent distribution across all screening sites, minimizing well-to-well variation.
3Loss of substance
If microarrays are used for cell transfection, then reagent consumption is reduced, but cross-contamination occurs and cell distribution variability increases
Solution Approach 1:
The microarray surface is segmented into discrete microchambers separated by physical walls and integrated valves. Each chamber is hermetically sealed during the loading process, preventing cross-contamination between adjacent spots while maintaining the low reagent consumption advantage of microarray formats.
Solution Approach 2:
Cells are trapped and distributed into the microchambers before the addition of RNAi reagents. This preliminary action sequence ensures that each chamber contains a controlled, uniform number of cells and prevents cross-contamination between different RNAi conditions, as the physical barriers are already in place.
4Productivity
If traditional robotic screening equipment is used, then high-throughput screening is achieved, but device complexity and maintenance requirements increase
Solution Approach 1:
The invention merges multiple functions (cell loading, reagent delivery, electroporation, and sealing) into a single integrated microfluidic device. This consolidation eliminates the need for separate robotic liquid handlers and electroporation equipment, reducing overall system complexity while maintaining high-throughput capability.
Solution Approach 2:
The microfluidic chip serves multiple functions: it acts as a cell culture chamber, a reagent delivery system, an electroporation device, and a sealing mechanism. This multi-functionality replaces several separate pieces of bulky equipment with a single versatile platform, reducing complexity and maintenance requirements.
5Productivity
If traditional screening equipment is used, then high-throughput screening is achieved, but accessibility for BSL-4 biocontainment is limited
Solution Approach 1:
By combining all screening operations into a single sealed microfluidic device, the system can be fully contained within BSL-4 facilities without requiring external robotic equipment. The device's compact size and integrated design allow it to be operated within biosafety containment, enabling high-throughput screening of dangerous pathogens.
Solution Approach 2:
The microfluidic chip uses thin-film sealing technology and flexible gaskets to create hermetic barriers that maintain biosafety containment. This allows the device to be operated within BSL-4 facilities while maintaining the integrity of the biocontainment environment, unlike bulky traditional equipment that cannot be placed within containment.
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 high-throughput screening with reduced reagent consumption, minimized cell usage, and enhanced biosafety, facilitating genome-wide RNAi studies in BSL-4 containment without bulky equipment, while maintaining statistical significance and preventing cross-contamination.
Implementation Method 1
microelectroporation device
Data Source
AI summary
We have developed an microelectroporation device that combines microarrays of oligonucleotides, microfluidic channels, and electroporation for cell transfection and high-throughput screening applications (e.g. RNA interference screens). Microarrays allow the deposition of thousands of different oligonucleotides in microscopic spots. Microfluidic channels and microwells enable efficient loading of cells into the device and prevent cross-contamination between different oligonucleotides spots. Electroporation allows optimal transfection of nucleic acids into cells (especially hard-to-transfect cells such as primary cells) by minimizing cell death while maximizing transfection efficiency. This invention has the advantage of a higher throughput and lower cost, while preventing cross-contamination compared to conventional screening technologies. Moreover, this device does not require bulky robotic liquid handling equipment and is inherently safer given that it is a closed system.