Dataset Information

Novel Frameshift CHD7 Mutation Related to CHARGE Syndrome.

ABSTRACT: CHARGE syndrome is a rare congenital condition characterized by 6 cardinal features: coloboma, heart defect, atresia choanae, retarded growth and development, genital anomalies, and ear anomalies/deafness. Mutations of the chromodomain helicase DNA-binding protein gene CHD7 are reported to be a major cause of CHARGE syndrome. Herein, we report the case of a 27-year-old patient presenting with typical symptoms who bears a novel heterozygous insertion in exon 2 of the CHD7 gene (c.327dupC) resulting in an amino acid substitution and a frameshift (p.Val110Argfs*22) that leads to a 131-amino-acid truncated polypeptide, likely representing a null allele. Parental genetic screening confirmed the sporadic origin of the mutation.

SUBMITTER: Martinez-Quintana E

PROVIDER: S-EPMC3919485 | biostudies-literature | 2014 Jan

REPOSITORIES: biostudies-literature

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Novel Frameshift CHD7 Mutation Related to CHARGE Syndrome.

Martínez-Quintana E E Rodríguez-González F F Garay-Sánchez P P Tugores A A

Molecular syndromology 20131004 1

CHARGE syndrome is a rare congenital condition characterized by 6 cardinal features: coloboma, heart defect, atresia choanae, retarded growth and development, genital anomalies, and ear anomalies/deafness. Mutations of the chromodomain helicase DNA-binding protein gene CHD7 are reported to be a major cause of CHARGE syndrome. Herein, we report the case of a 27-year-old patient presenting with typical symptoms who bears a novel heterozygous insertion in exon 2 of the CHD7 gene (c.327dupC) resulti ...[more]

PMID: 24550764

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Project description:Background: CHARGE syndrome (CS) is a single-gene genetic disorder with multiple organ malformations caused by a variant of the chromodomain helicase DNA-binding protein 7 (CHD7) gene on chromosome 8q12.1. In this study, we aimed to investigate new variants that have emerged in these cases compared with typical CS and the relationship between the genes and phenotypes. Methods: Patients with suspected genetic diseases were subjected to Whole Exome Sequencing (WES) at a genetics laboratory in Guangzhou. The average sequencing coverage depth was >200 ×, and 96% was >20 ×. The variant interpretation was manipulated according to the American College of Medical Genetics (ACMG) guidelines. Molecular data on databases for ClinVar and CHD7 were also collected and collated. We reviewed the currently described CHD7 variants and analyzed the genetic variation and phenotypic heterogeneity. Results: Data of 12 patients with CS from four hospitals in China were collected. According to gestational age, most of them (8/12) were near-term babies with a lower birth weight than their peers, averaging 2.62 kg. In this study, the most common phenotypes were respiratory tract malformations (11/12), heart malformations (10/12), and central nervous system malformations (9/12). Two fetuses were confirmed to have brain or heart abnormalities during prenatal testing, while 10/12 were found to have abnormalities during prenatal testing. The maximum Acute Physiology and Chronic Health Evaluation (APACHE II) score at admission was 19, and the average was 11.58. Five variants in the CHD7 gene c.7012C > T (p.Q2338*), c.7868delC (p.P2623Rfs*16), c.5405-3C > G, c.6936 + 2T > C, and c.8077-2A > G) were novel and were located in exons 33, 36, and introns 25, 32, and 37, respectively. There may be a positive correlation between exon location and phenotype. Conclusion: Five novel variants were discovered. These expanded the mutational spectrum of the CHD7 gene and the phenotype of CS. There may be a correlation between the new mutation sites and the phenotype, which has some reference value for the evaluation of mutation sites.

Dataset Information

Novel Frameshift CHD7 Mutation Related to CHARGE Syndrome.

Publications

Novel Frameshift CHD7 Mutation Related to CHARGE Syndrome.

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