Haisong Bu1,2,3, Guowen Sun4, Yun Zhu4, Yifeng Yang1,2, Zhiping Tan1,2, Tianli Zhao1,2, Shijun Hu5,6,7. 1. Department of Cardiovascular Surgery, The Second Xiangya Hospital, Central South University, 139 Renmin Central Road, Changsha, 410011, Hunan, People's Republic of China. 2. Central South University Center for Clinical Gene Diagnosis and Treatment, the Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, People's Republic of China. 3. Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, 55902, USA. 4. Department of Cardiothoracic Surgery, Chenzhou No. 1 People's Hospital, Chenzhou, 423000, Hunan, People's Republic of China. 5. Department of Cardiovascular Surgery, The Second Xiangya Hospital, Central South University, 139 Renmin Central Road, Changsha, 410011, Hunan, People's Republic of China. hushijun@csu.edu.cn. 6. Central South University Center for Clinical Gene Diagnosis and Treatment, the Second Xiangya Hospital, Central South University, Changsha, 410011, Hunan, People's Republic of China. hushijun@csu.edu.cn. 7. Department of Cardiovascular Surgery, The German Heart Centre, 80636, Munich, Germany. hushijun@csu.edu.cn.
Abstract
BACKGROUND: Although most cases of atrial septal defect (ASD) are sporadic, familial cases have been reported, which may be caused by mutation of transcription factor GATA binding protein 4 (GATA4). Herein we combined whole-exome sequencing and bioinformatics strategies to identify a novel mutation in GATA4 accounting for the etiology in a Chinese family with ASD. METHODS: We identified kindred spanning 3 generations in which 3 of 12 (25.0%) individuals had ASD. Punctilious records for the subjects included complete physical examination, transthoracic echocardiography, electrocardiograph and surgical confirming. Whole-exome capture and high-throughput sequencing were performed on the proband III.1. Sanger sequencing was used to validate the candidate variants, and segregation analyses were performed in the family members. RESULTS: Direct sequencing of GATA4 from the genomic DNA of family members identified a T-to-C transition at nucleotide 929 in exon 5 that predicted a methionine to threonine substitution at codon 310 (M310T) in the nuclear localization signal (NLS) region. Two affected members (II.2 and III.3) and the proband (III.1) who was recognized as a carrier exhibited this mutation, whereas the other unaffected family members or control individuals did not. More importantly, the mutation GATA4 (c.T929C: p.M310T) has not been reported previously in either familial or sporadic cases of congenital heart defects (CHD). CONCLUSIONS: We identified for the first time a novel M310T mutation in the GATA4 gene that is located in the NLS region and leads to family ASD with arrhythmias. However, the mechanism by which this pathogenic mutation contributes to the development of heart defect and tachyarrhythmias remains to be ascertained.
BACKGROUND: Although most cases of atrial septal defect (ASD) are sporadic, familial cases have been reported, which may be caused by mutation of transcription factor GATA binding protein 4 (GATA4). Herein we combined whole-exome sequencing and bioinformatics strategies to identify a novel mutation in GATA4 accounting for the etiology in a Chinese family with ASD. METHODS: We identified kindred spanning 3 generations in which 3 of 12 (25.0%) individuals had ASD. Punctilious records for the subjects included complete physical examination, transthoracic echocardiography, electrocardiograph and surgical confirming. Whole-exome capture and high-throughput sequencing were performed on the proband III.1. Sanger sequencing was used to validate the candidate variants, and segregation analyses were performed in the family members. RESULTS: Direct sequencing of GATA4 from the genomic DNA of family members identified a T-to-C transition at nucleotide 929 in exon 5 that predicted a methionine to threonine substitution at codon 310 (M310T) in the nuclear localization signal (NLS) region. Two affected members (II.2 and III.3) and the proband (III.1) who was recognized as a carrier exhibited this mutation, whereas the other unaffected family members or control individuals did not. More importantly, the mutation GATA4 (c.T929C: p.M310T) has not been reported previously in either familial or sporadic cases of congenital heart defects (CHD). CONCLUSIONS: We identified for the first time a novel M310T mutation in the GATA4 gene that is located in the NLS region and leads to family ASD with arrhythmias. However, the mechanism by which this pathogenic mutation contributes to the development of heart defect and tachyarrhythmias remains to be ascertained.
Authors: A Okubo; O Miyoshi; K Baba; M Takagi; K Tsukamoto; A Kinoshita; K Yoshiura; T Kishino; T Ohta; N Niikawa; N Matsumoto Journal: J Med Genet Date: 2004-07 Impact factor: 6.318
Authors: A Sarkozy; E Conti; C Neri; R D'Agostino; M C Digilio; G Esposito; A Toscano; B Marino; A Pizzuti; B Dallapiccola Journal: J Med Genet Date: 2005-02 Impact factor: 6.318