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Updated: Aug 30, 2025
One-channel Cell-attached Patch-clamp Recording
Published on: June 9, 2014
Biophysical characterization of light-gated ion channels using planar automated patch clamp
Elena G Govorunova1, Oleg A Sineshchekov1, Leonid S Brown2
1Department of Biochemistry and Molecular Biology, Center for Membrane Biology, The University of Texas Health Science Center at Houston McGovern Medical School, Houston, TX, United States.
Abstract:
Channelrhodopsins (ChRs) are proteins that guide phototaxis in protists and exhibit light-gated channel conductance when their genes are heterologously expressed in mammalian cells. ChRs are widely used as molecular tools to control neurons and cardiomyocytes with light (optogenetics). Cation- and anion-selective ChRs (CCRs and ACRs, respectively) enable stimulation and inhibition of neuronal activity by depolarization and hyperpolarization of the membrane, respectively. More than 400 natural ChR variants have been identified so far, and high-throughput polynucleotide sequencing projects add many more each year. However, electrophysiological characterization of new ChRs lags behind because it is mostly done by time-consuming manual patch clamp (MPC). Here we report using a high-throughput automated patch clamp (APC) platform, SyncroPatch 384i from Nanion Technologies, for ChR research. We find that this instrument can be used for determination of the light intensity dependence and current-voltage relationships in ChRs and discuss its advantages and limitations.
Insights
Automated patch clamp platforms accelerate the electrophysiological characterization of channelrhodopsins (ChRs), enabling faster optogenetic tool development. This high-throughput method efficiently analyzes ChR light responses and current-voltage relationships.
Area of Science:
- Optogenetics
- Molecular Biology
- Neuroscience
Background:
- Channelrhodopsins (ChRs) are light-gated ion channels crucial for optogenetics.
- Over 400 natural ChR variants exist, with new ones continually discovered.
- Electrophysiological characterization of novel ChRs is a bottleneck due to time-consuming manual patch clamp (MPC).
Purpose of the Study:
- To evaluate a high-throughput automated patch clamp (APC) platform for channelrhodopsin research.
- To assess the utility of APC for characterizing ChR properties like light sensitivity and ion selectivity.
Main Methods:
- Utilized the SyncroPatch 384i automated patch clamp platform.
- Performed electrophysiological recordings on heterologously expressed channelrhodopsins.
- Determined light intensity dependence and current-voltage relationships.
Main Results:
- The APC platform successfully characterized channelrhodopsins.
- Key electrophysiological parameters, including light response and I-V curves, were determined.
- The study identified advantages and limitations of using APC for ChR research.
Conclusions:
- Automated patch clamp technology can significantly accelerate the characterization of channelrhodopsins.
- This high-throughput approach facilitates the development of new optogenetic tools.
- APC offers a viable alternative to manual patch clamp for large-scale ChR screening.
