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The Fabrication and Operation of a Continuous Flow, Micro-Electroporation System with Permeabilization Detection
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Microfluidic Screening of Electric Fields for Electroporation.
Paulo A Garcia1, Zhifei Ge1, Jeffrey L Moran1
1Laboratory for Energy and Microsystems Innovation, Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 USA.
Scientific Reports
|February 20, 2016
Summary
Researchers developed a microfluidic assay to measure the electric field needed for bacterial electroporation. This method accurately determines the critical threshold, enabling optimized protocols for genetic transformation and improved cell viability.
Area of Science:
- Biotechnology
- Molecular Biology
- Microbiology
Background:
- Electroporation is a key technique for introducing molecules into cells, but its underlying mechanism and optimal parameters are not fully understood.
- Developing precise methods to determine electroporation thresholds is crucial for improving efficiency and cell survival.
Purpose of the Study:
- To develop and validate a rapid microfluidic assay for determining the critical electric field threshold for bacterial electroporation.
- To enable the optimization of electroporation protocols, minimizing cellular damage and maximizing transfection success.
Main Methods:
- A microfluidic device with a converging channel was engineered to amplify electric fields.
- Bacterial cells were exposed to electric pulses in the presence of a membrane-impermeant dye (SYTOX®).
- The critical electric field was calculated by correlating fluorescence (indicating membrane permeabilization) with electric field strength within the microfluidic device.
Main Results:
- The assay successfully characterized the critical electric field thresholds for key bacterial strains: Escherichia coli BL21 (3.65 ± 0.09 kV/cm), Corynebacterium glutamicum (5.20 ± 0.20 kV/cm), and Mycobacterium smegmatis (5.56 ± 0.08 kV/cm).
- The microfluidic assay provides a rapid and accurate method for quantifying electroporation thresholds.
Conclusions:
- The developed microfluidic assay accurately determines critical electric field thresholds for bacterial electroporation.
- This method facilitates the development of optimized electroporation protocols, enhancing genetic transformation efficiency and cell viability for diverse microbial species, including challenging strains.
