Patch Selection
Patch Selection - Related Videos
08:39
Whole-cell Patch-clamp Recordings for Electrophysiological Determination of Ion Selectivity in Channelrhodopsins
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Cited by 26 •
2017
This article describes how the ion selectivity of channelrhodopsin is determined with electrophysiological whole-cell patch-clamp recordings using HEK293 cells. Here, the experimental procedure for investigating chloride selectivity of an anion-selective channelrhodopsin is demonstrated. However, the procedure is transferable to other channelrhodopsins of distinct selectivity.
09:43
Patch Clamp Electrophysiology
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2023
Neuron cell membranes are populated with ion channels that control the movement of charge into and out of the cell, thereby regulating neuron firing. One extremely useful technique for investigating the biophysical properties of these channels is called patch clamp recording. In this method, neuroscientists place a polished glass micropipette against a cell and apply suction to form a high resistance seal. This process isolates a small “patch” of membrane that contains one or more ion channels.
01:02
Long-patch Base Excision Repair
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2020
Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are: Lesion type: Depending on the type of base damage, a specific DNA glycosylase - mono or bifunctional, is recruited to the damaged site. While the sequential action of a monofunctional glycosylase favors long patch repair...
11:01
A Computer-assisted Multi-electrode Patch-clamp System
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Cited by 49 •
2013
Multi-electrode patch-clamp recordings constitute a complex task. Here we show how, by automating of many of the experimental steps, it is possible to accelerate the process leading to qualitative improvement in performance and number of recordings.
13:07
One-channel Cell-attached Patch-clamp Recording
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Cited by 17 •
2014
Described here is a procedure for obtaining long stretches of current recording from one ion channel with the cell-attached patch-clamp technique. This method allows for observing, in real time, the pattern of open-close channel conformations that underlie the biological signal. These data inform about channel properties in undisturbed biological membranes.
FAQs
The membrane region chosen for recording influences how closely the measurement reflects the biological question. A site may be preferred because it is accessible, stable, or associated with the ion-channel activity under investigation. Selecting a relevant location helps connect localized membrane behavior with broader properties such as cellular excitability, ion transport, receptor function, and signaling.
A high-resistance seal helps preserve the quality of the electrophysiological recording by limiting unwanted interference between the selected membrane region and its surroundings. Seal quality therefore affects signal clarity and the ability to distinguish genuine channel behavior from artifacts. Poor sealing can weaken confidence that observed electrical activity originates from the intended membrane patch.
Suitability depends on several linked factors: the membrane location, how easily the pipette can reach it, the stability of the selected region, and whether its ion-channel activity matches the experimental question. Considering these factors together prevents researchers from treating every accessible area as equally informative and supports measurements that are both technically reliable and biologically relevant.
Careful selection combines a relevant membrane site with a stable recording configuration and a high-resistance seal. This reduces the chance that irregularities in the measurement will be mistaken for ion-channel behavior. The resulting data can more reliably associate electrical signals with the selected membrane region, strengthening interpretation of channel activity and localized membrane properties.
Researchers first position the recording pipette against an accessible membrane region, then form a high-resistance seal and evaluate whether the selected patch is stable and relevant to the channel activity being studied. This sequence links physical access with recording quality and biological purpose, helping establish a measurement suitable for analyzing localized electrophysiological behavior.
They would favor a region when its location, accessibility, or stability better supports the intended measurement, or when it is associated with the ion-channel activity of interest. The choice becomes especially important when investigating localized receptor function, ion transport, or cellular signaling, because different membrane regions can provide different insights into how membrane properties contribute to cell physiology.
A selected membrane patch can provide localized information about ion-channel behavior and membrane properties. Researchers can use these measurements to examine processes related to membrane excitability, ion transport, receptor function, and cellular signaling. Interpreting the local recording in relation to whole-cell physiology helps connect events at the membrane with broader cellular function.