Abstract
Genetic mutations in GATA4, a transcriptional factor, have been found to cause congenital heart diseases. The underlying mechanism, however, remains largely unknown. We previously reported 7 heterozygous variants in patients with ventricular septal defects (VSD). Here we functionally characterized a de novo mutation p.S335X and demonstrated that this mutation led to the pre-termination of its translation, producing a truncated GATA4 lacking a conservative region at C-terminus. Truncated GATA4 did not disturb its subcellular localization; however, it delayed the cardiomyocyte differentiation in P19cl6 model and prohibited Bcl2 expression that led to apoptosis proved by fragmented genomic DNA and positive TUNEL staining in H9C2 cells. By ChIP assay, we showed that GATA4 without C-terminus reduced its DNA binding affinity and suppressed the expressions of its target genes. These findings suggest that C-terminus of GATA4 is critical to maintain DNA binding, and genetic mutations in this region may affect genes important for myocyte apoptosis and differentiation associated with congenital heart defects.
Keywords: Apoptosis, DNA-binding, differentiation, GATA4, ventricular septal defect.
Current Molecular Medicine
Title:Mutation p.S335X in GATA4 Reduces its DNA Binding Affinity and Enhances Cell Apoptosis Associated with Ventricular Septal Defect
Volume: 13 Issue: 6
Author(s): F. Yang, M. Wu, Y. Li, G.-Y. Zheng, H.-Q. Cao, W. Sun, R. Yang, H. Zhang, Y.-H. Sheng, X.-Q. Kong, X.-L. Tian and L. Zhou
Affiliation:
Keywords: Apoptosis, DNA-binding, differentiation, GATA4, ventricular septal defect.
Abstract: Genetic mutations in GATA4, a transcriptional factor, have been found to cause congenital heart diseases. The underlying mechanism, however, remains largely unknown. We previously reported 7 heterozygous variants in patients with ventricular septal defects (VSD). Here we functionally characterized a de novo mutation p.S335X and demonstrated that this mutation led to the pre-termination of its translation, producing a truncated GATA4 lacking a conservative region at C-terminus. Truncated GATA4 did not disturb its subcellular localization; however, it delayed the cardiomyocyte differentiation in P19cl6 model and prohibited Bcl2 expression that led to apoptosis proved by fragmented genomic DNA and positive TUNEL staining in H9C2 cells. By ChIP assay, we showed that GATA4 without C-terminus reduced its DNA binding affinity and suppressed the expressions of its target genes. These findings suggest that C-terminus of GATA4 is critical to maintain DNA binding, and genetic mutations in this region may affect genes important for myocyte apoptosis and differentiation associated with congenital heart defects.
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Yang F., Wu M., Li Y., Zheng G.-Y., Cao H.-Q., Sun W., Yang R., Zhang H., Sheng Y.-H., Kong X.-Q., Tian X.-L. and Zhou L., Mutation p.S335X in GATA4 Reduces its DNA Binding Affinity and Enhances Cell Apoptosis Associated with Ventricular Septal Defect, Current Molecular Medicine 2013; 13 (6) . https://dx.doi.org/10.2174/15665240113139990053
DOI https://dx.doi.org/10.2174/15665240113139990053 |
Print ISSN 1566-5240 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-5666 |
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