GATA6 loss-of-function mutations contribute to familial dilated cardiomyopathy

Xu,Lei; Zhao,Lan; Yuan,Fang; Jiang,Wei-Feng; Liu,Hua; Li,Ruo-Gu; Xu,Ying-Jia; Zhang,Min; Fang,Wei-Yi; Qu,Xin-Kai; Yang,Yi-Qing; Qiu,Xing-Biao

doi:10.3892/ijmm.2014.1896

GATA6 loss-of-function mutations contribute to familial dilated cardiomyopathy

Authors:
- Lei Xu
- Lan Zhao
- Fang Yuan
- Wei-Feng Jiang
- Hua Liu
- Ruo-Gu Li
- Ying-Jia Xu
- Min Zhang
- Wei-Yi Fang
- Xin-Kai Qu
- Yi-Qing Yang
- Xing-Biao Qiu
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Affiliations: Department of Cardiology, Shanghai Chest Hospital, Shanghai Jiao Tong University, Shanghai 200030, P.R. China, Department of Cardiology, Yantaishan Hospital, Yantai, Shandong 264001, P.R. China
Published online on: August 13, 2014 https://doi.org/10.3892/ijmm.2014.1896
Pages: 1315-1322

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Abstract

Dilated cardiomyopathy (DCM), the most prevalent form of primary heart muscle disease, is the third most common cause of heart failure and the most frequent reason for cardiac transplantation. Mounting evidence has demonstrated that genetic risk factors are crucial in the pathogenesis of DCM. However, DCM is genetically heterogeneous, and the genetic basis of DCM in a large majority of cases remains unclear. In the current study, the coding exons and flanking introns of the GATA6 gene, which encodes a zinc‑finger transcription factor essential for cardiogenesis, was sequenced in 140 unrelated patients with DCM, and two novel heterozygous mutations, p.C447Y and p.H475R, were identified in two index patients with DCM, respectively. Analysis of the pedigrees showed that in each family the mutation co-segregated with DCM transmitted in an autosomal-dominant pattern, with complete penetrance. The missense mutations were absent in 400 control chromosomes and predicted to be disease-causing by MutationTaster or probably damaging by PolyPhen-2. The alignment of multiple GATA6 proteins across species revealed that the altered amino acids were completely conserved evolutionarily. The functional assays showed that the mutated GATA6 proteins were associated with significantly reduced transcriptional activation in comparison with their wild-type counterpart. To the best of our knowledge, this is the first study on the association of GATA6 loss-of-function mutations with enhanced susceptibility to familial DCM, which provides novel insight into the molecular mechanism of DCM and suggests potential implications for the antenatal prophylaxis and allele-specific treatment of DCM.

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