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Voltage-gated Ion Channels01:26

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Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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CaV1.2 channelopathic mutations evoke diverse pathophysiological mechanisms.

Moradeke A Bamgboye1, Kevin G Herold1, Daiana C O Vieira1

  • 1Department of Physiology, University of Maryland School of Medicine, Baltimore, MD.

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Mutations in the CaV1.2 channel's S6 region cause Timothy syndrome (TS) and neurodevelopmental issues. This study reveals distinct effects on channel function, explaining varied symptoms in CaV1.2 channelopathies.

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Area of Science:

  • Molecular biology
  • Biophysics
  • Neuroscience

Background:

  • The first pathogenic CaV1.2 mutation caused Timothy syndrome (TS), a disorder with cardiac and neurodevelopmental symptoms like autism spectrum disorder (ASD).
  • Mutations in the CaV1.2 S6 region are common, but the mechanisms behind neurodevelopmental deficits remain unclear.
  • Understanding CaV1.2 channelopathies requires exploring how S6 mutations affect channel function beyond activation.

Purpose of the Study:

  • To investigate the diverse mechanisms by which CaV1.2 S6 region mutations impact channel biophysics.
  • To elucidate the relationship between specific S6 mutation effects and clinical manifestations, including neurodevelopmental deficits.
  • To establish a structure-function framework for CaV1.2 S6 mutations.

Main Methods:

  • Whole-cell patch clamp electrophysiology.
  • Quantitative calcium imaging.
  • Single channel recordings.

Main Results:

  • CaV1.2 S6 region mutations independently affect channel activation, voltage-dependent inactivation (VDI), and Ca2+-dependent inactivation (CDI).
  • Mechanisms for altered CDI include changes in channel gating and potential disruption of inactivation signal transduction.
  • Distinct biophysical defects correlate with specific clinical phenotypes observed in patients.

Conclusions:

  • CaV1.2 S6 mutations have varied and separable impacts on channel function, contributing to the complex clinical spectrum of channelopathies.
  • This work provides a framework for understanding how S6 mutations lead to distinct cardiac and neurodevelopmental symptoms.
  • Further research into these biophysical defects can inform therapeutic strategies for CaV1.2-related disorders.