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Updated: May 8, 2026

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
Published on: July 5, 2021
[Genetic predictors of sick sinus node syndrome]
Heredity plays a key role in sick sinus node syndrome (SSNS). Genetic variations in specific genes are linked to hereditary SSNS and its clinical presentations.
Area of Science:
- Cardiology
- Genetics
- Molecular Biology
Context:
- Sick sinus node syndrome (SSNS) is a complex cardiac arrhythmia.
- Idiopathic SSNS often presents with unclear etiology.
- Hereditary factors are increasingly recognized in cardiovascular diseases.
Purpose:
- To investigate the role of heredity in the development of idiopathic sick sinus node syndrome (SSNS).
- To identify specific gene polymorphisms associated with hereditary SSNS.
- To explore the relationship between genotypes and clinical variants of SSNS.
Summary:
- This study examined 14 probands and 110 relatives from families with idiopathic SSNS.
- Polymorphisms in genes for beta-2-adrenoreceptor, endothelial NO synthase, connexin 40, cardiac sodium channels, and cardiac myosin heavy chains were implicated in hereditary SSNS.
- Associations were found between clinical SSNS variants and the genotypes of these studied genes.
Impact:
- Provides insights into the genetic underpinnings of SSNS.
- May inform genetic counseling and risk assessment for families with SSNS.
- Highlights potential targets for future research in SSNS pathogenesis.
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