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Guo YX, Ma HX, Zhang YX, Chen ZH, Zhai QX. Whole-Exome Sequencing for Identifying Genetic Causes of Intellectual Developmental Disorders. Int J Gen Med 2021; 14:1275-1282. [PMID: 33880059 PMCID: PMC8053495 DOI: 10.2147/ijgm.s300775] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Accepted: 02/22/2021] [Indexed: 01/29/2023] Open
Abstract
Background Intellectual developmental disorders (IDD) generally refers to the persistent impairment of cognitive activities and mental retardation caused by physical damage to the brain or incomplete brain development. We aimed to explore its genetic causes. Methods In this study, 21 IDD patients were recruited. The Gesell developmental scales (GDS) and Wechsler intelligence scale for children (WISC) were used to assess the impaired level of intellectual development for all probands. A superconducting MRI scanner (Philips AcsNT 3.0 T Philips, Best, The Netherlands) was used to perform a plain MRI scan of the skull on the probands. The whole-exome sequencing was carried out using next-generation sequencing in all probands and their families. Results Eight had seizures and four had typical characteristics of autism. Pregnancy and delivery were uneventful except for three patients. Moderate IDD (52.4%) accounted for the majority. The abnormal MRI results included ventriculomegaly, pachygyria, broadening external cerebral space, abnormal signal change and agenesis of corpus callosum. Eleven variants were identified, including the variant in CREBBP, MECP2, HCFC1, ATRX, RAB39B, CLCN4, DYRK1A and CASKgenes. The function areas result of gene-positive group were compared to that of gene-negative group. Not significant (p>0.05) items were revealed after this analysis. Conclusion Eleven variants were identified, including the variant in CREBBP, MECP2, HCFC1, ATRX, RAB39B, CLCN4, DYRK1A and CASK genes. The function areas result of gene-positive group were not significantly different from the gene-negative group.
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Affiliation(s)
- Yu-Xiong Guo
- The Second School of Clinical Medicine, Southern Medical University, Guangzhou, 510280, People's Republic of China.,Department of Pediatrics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, People's Republic of China
| | - Hong-Xia Ma
- The Second School of Clinical Medicine, Southern Medical University, Guangzhou, 510280, People's Republic of China.,Department of Pediatrics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, People's Republic of China.,Department of Pediatrics, Affiliated Hospital of Guangdong Medical University, Zhanjiang, 524000, People's Republic of China
| | - Yu-Xin Zhang
- Department of Pediatrics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, People's Republic of China
| | - Zhi-Hong Chen
- Department of Pediatrics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, People's Republic of China
| | - Qiong-Xiang Zhai
- The Second School of Clinical Medicine, Southern Medical University, Guangzhou, 510280, People's Republic of China.,Department of Pediatrics, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, People's Republic of China
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Li C, Zhang J, Li J, Qiao G, Zhan Y, Xu Y, Yang H. BACs-on-Beads Assay for the Prenatal Diagnosis of Microdeletion and Microduplication Syndromes. Mol Diagn Ther 2021; 25:339-349. [PMID: 33826125 DOI: 10.1007/s40291-021-00522-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/06/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVE To evaluate the clinical value of BACs-on-Beads (BoBs) assay in detection of microdeletion and microduplication syndromes. METHODS A total of 6,814 cases of amniotic fluid cells collected from January 2015 to July 2020 in our hospital were analyzed by chromosomal karyotyping and BoBs assay. Fluorescence in situ hybridization (FISH) or chromosomal microarray analysis (CMA) provided further validation for the cases of microdeletion and microduplication. RESULTS Thirty microdeletion and microduplication syndromes were identified by BoBs with an incidence of ~1/227, including 22q11.2 microduplication (0.044%, 3/6814), DiGeorge I syndrome (0.044%, 3/6814), 17p11.2 microduplication (0.015%, 1/6814), Smith-Magenis syndrome (0.015%, 1/6814), 17p11.2p11.3 microduplication (0.015%, 1/6814), Williams-Beuren syndrome (0.088%, 6/6814), 7q11.2 microduplication (0.029%, 2/6814), DiGeorge II syndrome (0.015%, 1/6814), 18p11.32p11.21 microduplication (0.015%, 1/6814), Wolf-Hirschhorn syndrome (0.029%, 2/6814), 4p16.3 microduplication (0.015%, 1/6814), Langer-Giedion syndrome (0.015%, 1/6814), Miller-Dieker syndrome (0.015%, 1/6814), Cri du Chat syndrome (0.015%, 1/6814), Xp22.31 microdeletion (0.059%, 4/6814), Prader-Willi syndrome (0.015%, 1/6814). High concordance was obtained between BoBs and FISH or CMA. However, only four cases were detected by chromosomal karyotyping. CONCLUSION BoBs assay can rapidly detect microdeletion and microduplication syndromes, which compensates the shortcomings of conventional chromosomal karyotyping and greatly improves the efficiency and accuracy of prenatal diagnosis.
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Affiliation(s)
- Chunyan Li
- Department of Obstetrics and Gynecology, Xijing Hospital, The Fourth Military Medical University, 127 West ChangLe Road, Xi'an, 710032, Shaanxi, China
| | - Jianfang Zhang
- Department of Obstetrics and Gynecology, Xijing Hospital, The Fourth Military Medical University, 127 West ChangLe Road, Xi'an, 710032, Shaanxi, China
| | - Jia Li
- Department of Obstetrics and Gynecology, Xijing Hospital, The Fourth Military Medical University, 127 West ChangLe Road, Xi'an, 710032, Shaanxi, China
| | - Guyuan Qiao
- Department of Obstetrics and Gynecology, Xijing Hospital, The Fourth Military Medical University, 127 West ChangLe Road, Xi'an, 710032, Shaanxi, China
| | - Ying Zhan
- Department of Obstetrics and Gynecology, 518 Hospital of PLA, Xi'an, 710043, Shaanxi, China
| | - Ying Xu
- Department of Obstetrics and Gynecology, Xijing Hospital, The Fourth Military Medical University, 127 West ChangLe Road, Xi'an, 710032, Shaanxi, China
| | - Hong Yang
- Department of Obstetrics and Gynecology, Xijing Hospital, The Fourth Military Medical University, 127 West ChangLe Road, Xi'an, 710032, Shaanxi, China.
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