Whole-cell Patch-clamp Recordings for Electrophysiological Determination of Ion Selectivity in Channelrhodopsins
Citations Over TimeTop 24% of 2017 papers
Abstract
Over the past decade, channelrhodopsins became indispensable in neuroscientific research where they are used as tools to non-invasively manipulate electrical processes in target cells. In this context, ion selectivity of a channelrhodopsin is of particular importance. This article describes the investigation of chloride selectivity for a recently identified anion-conducting channelrhodopsin of Proteomonas sulcata via electrophysiological patch-clamp recordings on HEK293 cells. The experimental procedure for measuring light-gated photocurrents demands a fast switchable - ideally monochromatic - light source coupled into the microscope of an otherwise conventional patch-clamp setup. Preparative procedures prior to the experiment are outlined involving preparation of buffered solutions, considerations on liquid junction potentials, seeding and transfection of cells, and pulling of patch pipettes. The actual recording of current-voltage relations to determine the reversal potentials for different chloride concentrations takes place 24 h to 48 h after transfection. Finally, electrophysiological data are analyzed with respect to theoretical considerations of chloride conduction.
Related Papers
- → An Introduction to Patch Clamp Recording(2020)48 cited
- → Channelrhodopsins for Cell-Type Specific Illumination of Cardiac Electrophysiology(2020)11 cited
- → Voltage-activated currents in the CRI-G1 rat insulin-secreting cell-line(1991)3 cited
- → Overview of Electrophysiology(1998)
- Electrophysiological characteristics of rat hippocampal CA1 neurons by infrared visual patch clamp method(2004)