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Related Concept Videos

Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

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.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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...
Patch Clamp01:18

Patch Clamp

Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique.
In this method, a glass micropipette containing electrolyte solution is tightly sealed against a small portion of the cell membrane. As a result, a patch of the cell...
Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein01:20

Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein

Antiepileptic drugs, such as levetiracetam (Keppra) and brivaracetam (Briviact), have emerged as crucial tools in managing epilepsy. These medications exert their therapeutic effects by targeting the synaptic vesicle protein SV2A, a transmembrane glycoprotein primarily found in the brain.
SV2A is a transmembrane glycoprotein located predominantly in the brain, modulating the release of neurotransmitters for neuronal communication. Both levetiracetam and brivaracetam exhibit a high affinity for...
Ligand-gated Ion Channels01:19

Ligand-gated Ion Channels

Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that include the...
Seizures: Classification01:13

Seizures: Classification

Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:

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Related Experiment Video

Updated: Jun 3, 2026

Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons
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Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons

Published on: June 6, 2025

ACMG/AMP variant classification specifications from the ClinGen Epilepsy Sodium Channel Variant Curation Expert

Lacey Smith1, Emily Bonkowski2, Anna Prentice3

  • 1Department of Neurology, Boston Children's Hospital, Boston, MA 02115.

Genetics in Medicine : Official Journal of the American College of Medical Genetics
|June 2, 2026
PubMed
Summary

This study refines variant classification for SCN genes, improving genetic diagnosis for epilepsy and neurodevelopmental disorders. Updated guidelines enhance accuracy for SCN1A, SCN2A, SCN3A, SCN8A, and SCN1B gene variants.

Keywords:
neurogeneticssodium channelvariant classification

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Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
07:15

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

Published on: January 16, 2019

Related Experiment Videos

Last Updated: Jun 3, 2026

Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons
08:04

Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons

Published on: June 6, 2025

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
07:15

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

Published on: January 16, 2019

Area of Science:

  • Genetics
  • Neuroscience
  • Molecular Biology

Background:

  • Pathogenic variants in SCN1A, SCN2A, SCN3A, SCN8A, and SCN1B are linked to epilepsy and neurodevelopmental disorders.
  • Accurate genetic diagnosis is crucial for patient management and therapeutic strategies.

Purpose of the Study:

  • To adapt and refine the American College of Medical Genetics and Genomics/Association for Molecular Pathology (ACMG/AMP) recommendations for classifying sequence variants in key SCN genes.
  • To establish standardized variant curation specifications for SCN1A, SCN2A, SCN3A, SCN8A, and SCN1B.

Main Methods:

  • Convened a multidisciplinary expert panel to evaluate existing variant classification guidelines.
  • Developed modified criteria incorporating clinical, bioinformatic, and functional data.
  • Piloted the adapted criteria on 37 variants with diverse classifications and types.

Main Results:

  • Modified specifications emphasize epilepsy syndrome classification and phenotyping.
  • Optimized population thresholds (e.g., BS1, BA1) and criteria for using paralogous gene data (e.g., PS1, PM5).
  • Provided enhanced guidance for interpreting functional data (e.g., PS3) in variant classification.

Conclusions:

  • Adoption of these modified specifications enhances the accuracy of variant classification for SCN genes.
  • Improved genetic diagnoses offer significant clinical and personal utility for individuals with epilepsy and neurodevelopmental disorders.
  • Accurate classification supports the development and application of precision therapeutics for these conditions.