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Updated: Jan 2, 2026
Ambulatory ECG Recording in Mice
Published on: May 27, 2010
Progressive cardiac arrhythmias and ECG abnormalities in the Huntington's disease BACHD mouse model
Yujie Zhu1, Isaac Shamblin1, Efrain Rodriguez2
1Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
Insights
Huntington's disease (HD) mouse models show cardiac conduction abnormalities and increased arrhythmia risk. Mutant Huntingtin protein may progressively impair the cardiac conduction system, raising sudden cardiac death risk in HD patients.
Area of Science:
- Cardiology
- Neurodegenerative Diseases
- Molecular Biology
Background:
- Huntington's disease (HD) is a dominant neurodegenerative disorder.
- HD patients exhibit higher rates of cardiac conduction abnormalities and sinoatrial node dysfunction, increasing arrhythmia risk.
Purpose of the Study:
- To investigate cardiac conduction abnormalities in a mouse model of Huntington's disease.
- To determine if mutant Huntingtin protein (mHTT) causes electrocardiogram (ECG) changes and arrhythmia susceptibility.
Main Methods:
- Utilized bacterial artificial chromosome mice expressing mHTT.
- Performed surface electrocardiograms (ECGs) to analyze arrhythmia susceptibility.
- Conducted histological and protein analysis of cardiac tissue.
Main Results:
- Observed prolonged QRS duration, premature ventricular contractions (PVCs), and premature atrial contractions (PACs).
- Identified abnormal histological and structural cardiac changes.
- Found decreased levels of desmosomal proteins plakophilin-2 and desmoglein-2.
Conclusions:
- Mutant Huntingtin protein can induce progressive cardiac conduction system pathology.
- This pathology increases susceptibility to arrhythmias and sudden cardiac death in HD.
- Targeting mHTT-related cardiac dysfunction may be crucial for managing HD patients.
Abstract:
Huntington's disease (HD) is a dominantly inherited neurodegenerative disease. There is accumulating evidence that HD patients have increased prevalence of conduction abnormalities and compromised sinoatrial node function which could lead to increased risk for arrhythmia. We used mutant Huntingtin (mHTT) expressing bacterial artificial chromosome Huntington's disease mice to determine if they exhibit electrocardiogram (ECG) abnormalities involving cardiac conduction that are known to increase risk of sudden arrhythmic death in humans. We obtained surface ECGs and analyzed arrhythmia susceptibility; we observed prolonged QRS duration, increases in PVCs as well as PACs. Abnormal histological and structural changes that could lead to cardiac conduction system dysfunction were seen. Finally, we observed decreases in desmosomal proteins, plakophilin-2 and desmoglein-2, which have been reported to cause cardiac arrhythmias and reduced conduction. Our study indicates that mHTT could cause progressive cardiac conduction system pathology that could increase the susceptibility to arrhythmias and sudden cardiac death in HD patients.
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