Discovery of Novel Variants on the CHD7 Gene: A Case Series of CHARGE Syndrome

作者全名："Wu, Xiangtao; Chen, Liang; Lu, Weihong; He, Shaoru; Li, Xiaowen; Sun, Lingling; Zhang, Longjiang; Wang, Dejuan; Zhang, Ruigui; Liu, Yumei; Sun, Yunxia; Feng, Zhichun; Wei Zhang, Victor"

作者地址："[Wu, Xiangtao; He, Shaoru] Southern Med Univ, Sch Clin Med 2, Guangzhou, Peoples R China; [Wu, Xiangtao; Chen, Liang; He, Shaoru; Zhang, Ruigui; Liu, Yumei; Sun, Yunxia] Guangdong Prov Peoples Hosp, Guangdong Acad Med Sci, Dept Neonatol, Guangzhou, Peoples R China; [Wu, Xiangtao; Lu, Weihong] Xinxiang Med Univ, Affiliated Hosp 1, Dept Pediat, Xinxiang, Peoples R China; [Li, Xiaowen] Chongqing Med Univ, Childrens Hosp, Neonatal Diag & Treatment Ctr, Natl Clin Res Ctr Child Hlth & Disorders,Minist Ed, Chongqing, Peoples R China; [Sun, Lingling; Zhang, Longjiang] Shenzhen Childrens Hosp, Shenzhen, Peoples R China; [Wang, Dejuan] Sun Yat Sen Univ, Affiliated Hosp Sun Yat 6, Dept Urol, Guangzhou, Peoples R China; [Feng, Zhichun] Chinese Peoples Liberat Army Gen Hosp, BaYi Childrens Hosp, Med Ctr Chinese PLA Gen Hosp 7, Fac Pediat,Dept Neonatol, Beijing, Peoples R China; [Wei Zhang, Victor] AmCare Genom Lab, Guangzhou, Peoples R China"

通信作者："He, SR (通讯作者)，Southern Med Univ, Sch Clin Med 2, Guangzhou, Peoples R China.; He, SR; Liu, YM (通讯作者)，Guangdong Prov Peoples Hosp, Guangdong Acad Med Sci, Dept Neonatol, Guangzhou, Peoples R China."

来源：FRONTIERS IN GENETICS

ESI学科分类：MOLECULAR BIOLOGY & GENETICS

WOS号：WOS:000837141700001

JCR分区：Q2

影响因子：3.7

年份：2022

卷号：13

期号：　

开始页：　

结束页：　

文献类型：Article

关键词：CHARGE syndrome; infants; respiratory malformations; phenotypes; mutation

摘要："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 x, and 96% was >20 x. 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."

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