Related Experiment Video
Updated: May 4, 2026
Programmed Electrical Stimulation in Mice
Published on: May 27, 2010
GATA4 loss-of-function mutations in familial atrial fibrillation
Yi-Qing Yang1, Mao-Ya Wang, Xian-Ling Zhang
1Department of Cardiovascular Research, Shanghai Chest Hospital, Medical College of Shanghai Jiaotong University, PR China. yang99yang66@hotmail.com
Insights
Genetic mutations in the GATA4 gene are linked to atrial fibrillation (AF), a common heart rhythm disorder. These GATA4 gene mutations impair its function, contributing to AF development.
Area of Science:
- Cardiology
- Genetics
- Molecular Biology
Background:
- Atrial fibrillation (AF) is a prevalent cardiac arrhythmia associated with significant morbidity and mortality.
- Genetic factors contribute to AF, but the underlying molecular mechanisms remain largely unknown.
- GATA4 is a crucial transcription factor for heart development.
Purpose of the Study:
- To investigate the role of GATA4 gene mutations in the pathogenesis of atrial fibrillation.
- To identify novel genetic variants in GATA4 associated with AF.
- To functionally characterize the impact of identified mutations on GATA4 activity.
Main Methods:
- Sequencing of the GATA4 gene in 130 unrelated AF patients and 200 healthy controls.
- Genotyping of family members of patients with identified mutations.
- Luciferase reporter assays to assess the functional consequences of GATA4 mutations.
Main Results:
- Two novel heterozygous GATA4 mutations (p.S70T and p.S160T) were identified in two unrelated families with AF.
- These mutations co-segregated with AF in affected families, exhibiting complete penetrance.
- Functional studies revealed significantly decreased transcriptional activity of the mutant GATA4 proteins.
Conclusions:
- GATA4 mutations are implicated in the molecular pathogenesis of atrial fibrillation.
- These findings enhance understanding of AF's genetic basis.
- The study suggests potential for genetic diagnosis and targeted gene therapy for AF.
Background:
Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia and a major source of the substantially increased morbidity and mortality. Growing studies demonstrate that genetic defects play pivotal roles in a subgroup of AF. However, AF is a genetically heterogeneous disorder and the molecular basis of AF in a majority of cases remains unknown.
Methods:
The whole coding region of the GATA4 gene, which encodes a zinc-finger transcription factor essential for cardiogenesis, was analyzed in 130 unrelated probands with AF in contrast to 200 unrelated ethnically matched healthy individuals used as controls. The available family members of the probands harboring the identified mutations were genotyped. The functional effect of the mutant GATA4 was characterized using a luciferase reporter assay system.
Results:
Two novel heterozygous GATA4 mutations, p.S70T and p.S160T, were identified in 2 unrelated families with AF inherited as an autosomal dominant trait, respectively, which co-segregated with AF in each family with complete penetrance. Functional analysis showed that the mutations of GATA4 were associated with a significantly decreased transcriptional activity.
Conclusion:
The findings provide new insight into the molecular mechanism involved in the pathogenesis of AF, suggesting the potential implications in the genetic diagnosis and gene-specific therapy of this common arrhythmia.
Related Concept Videos
01:28Mechanism of Cardiac Arrhythmias
01:29Cardiomyopathy III: Hypertrophic Cardiomyopathy
01:29Cardiomyopathy IV: Restrictive Cardiomyopathy