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Updated: Jun 29, 2026
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Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes
Published on: March 12, 2013
Dysfunction in ankyrin-B-dependent ion channel and transporter targeting causes human sinus node disease
Solena Le Scouarnec1, Naina Bhasin, Claude Vieyres
1Institut National de la Sante et de la Recherche Medicale, UMR 915, F-44000 Nantes, France.
Summary
Ankyrin-B (ANKB) protein dysfunction causes human sinus node dysfunction (SND). This study reveals ANKB is essential for normal heart pacing and sinoatrial node electrical activity.
Area of Science:
- Cardiovascular Genetics
- Molecular Cardiology
- Electrophysiology
Background:
- Human atrial and ventricular arrhythmias are linked to ion channel genes, but mechanisms of sinus node dysfunction (SND) remain unclear.
- Sinus node dysfunction (SND) affects heart rate regulation and can lead to severe cardiovascular events.
Purpose of the Study:
- To elucidate the genetic and molecular mechanisms underlying human sinus node dysfunction (SND).
- To investigate the role of ankyrin-B (ANKB) in sinoatrial node function and cardiac pacing.
Main Methods:
- Genetic mapping of families with severe SND to the ANK2 locus.
- Phenotypic analysis of mice heterozygous for AnkB.
- Investigation of ANKB's role in sinoatrial node cell channel and transporter organization.
Main Results:
- Two families with severe SND were mapped to the human ANK2 locus.
- AnkB-deficient mice exhibited bradycardia and rate variability, mimicking human SND.
- AnkB is crucial for organizing sinoatrial node cell ion channels and transporters, essential for cardiac pacing.
Conclusions:
- Ankyrin-B (ANKB) dysfunction causes human sinus node dysfunction (SND) by disrupting sinoatrial node electrical activity.
- ANKB-based trafficking pathways are critical for normal sinoatrial node function and physiological cardiac pacing.
- Abnormal ion channel targeting and membrane organization in the sinoatrial node are linked to SND.
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