Mutation spectrum of the GATA4 gene in patients with idiopathic atrial fibrillation.

Molecular Biology Reports
Jun WangYi-Qing Yang

Abstract

Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia associated with substantially increased morbidity and mortality. Growing evidence strongly implicates hereditary determinants in the pathogenesis of AF. However, AF is genetically heterogeneous and the genetic defects responsible for AF in the majority of cases remain to be identified. In this study, all the coding exons and splice junctions of GATA4, a gene encoding a zinc-finger transcription factor critical for normal cardiac morphogenesis, were sequenced in a cohort of 150 unrelated patients with idiopathic AF. The available relatives of the mutation carriers and a total of 200 unrelated ethnically matched healthy individuals used as controls were genotyped for the presence of mutations identified in index patients. The functional effect of the mutant GATA4 was characterized using a luciferase reporter assay system. As a result, two novel heterozygous GATA4 mutations (p.Y38D and p.P103A) were identified in 2 unrelated families with AF, respectively. In each family the mutation co-segregated with AF and was absent in the 400 control chromosomes. Functional analysis showed that the mutations of GATA4 were associated with a significantly decreased transcr...Continue Reading

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