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Ion channel chameleons: Switching ion selectivity by alternative splicing
1Department of Physiology and Cellular Biophysics, Columbia University, New York, New York, USA.
The Journal of Biological Chemistry
|January 27, 2023
Summary
Alternative splicing allows a single calcium channel gene (CaV3) to produce both calcium- and sodium-permeable channels. This mechanism tunes ion selectivity in voltage-gated ion channels, impacting physiology and evolution.
Area of Science:
- Molecular Biology
- Ion Channel Physiology
- Evolutionary Biology
Background:
- Voltage-gated ion channels (sodium and calcium) exhibit high ion selectivity despite structural similarities.
- Ion selectivity is traditionally attributed to specific ion binding within the channel's selectivity filter (SF).
Purpose of the Study:
- To investigate the role of alternative splicing in tuning ion selectivity.
- To explore the evolutionary basis of ion selectivity in voltage-gated channels.
Main Methods:
- Studied ancestral ion channels from the pond snail (Lymnaea stagnalis).
- Analyzed the function of a single CaV3 gene under different cellular contexts.
Main Results:
- Demonstrated that alternative splicing of a single CaV3 gene can yield both Ca2+-permeable and Na+-permeable channels.
- Showed that cellular context dictates the ion permeability of the encoded channel.
Conclusions:
- Alternative splicing is a key mechanism for tuning ion selectivity in voltage-gated channels.
- Findings provide insights into the physiological regulation and evolutionary origins of ion selectivity.
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