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Liu C, Liu RH, Sun GF, Yang L, Zheng QL, Wei SY, Kong QX, Li QB. Two siblings suffering from Angelman Syndrome with a novel c.1146T>G mutation in UBE3A: A case report. Biomed Rep 2022; 16:48. [PMID: 35620312 PMCID: PMC9112374 DOI: 10.3892/br.2022.1531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 03/10/2022] [Indexed: 11/06/2022] Open
Affiliation(s)
- Can Liu
- Jining Medical University, Jining, Shandong 272000, P.R. China
| | - Rui-Hua Liu
- Department of Pediatrics, Affiliated Hospital of Jining Medical University, Jining, Shandong 272000, P.R. China
| | - Guang-Fei Sun
- Department of Pediatrics, Affiliated Hospital of Jining Medical University, Jining, Shandong 272000, P.R. China
| | - Lin Yang
- Department of Pediatrics, Affiliated Hospital of Jining Medical University, Jining, Shandong 272000, P.R. China
| | - Qin-Liang Zheng
- Department of Pediatrics, Affiliated Hospital of Jining Medical University, Jining, Shandong 272000, P.R. China
| | - Shan-Ying Wei
- Department of Pediatrics, Affiliated Hospital of Jining Medical University, Jining, Shandong 272000, P.R. China
| | - Qing-Xia Kong
- Department of Neurology, Affiliated Hospital of Jining Medical University, Jining, Shandong 272000, P.R. China
| | - Qiu-Bo Li
- Department of Pediatrics, Affiliated Hospital of Jining Medical University, Jining, Shandong 272000, P.R. China
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Triono A, Iskandar K, Nugrahanto AP, Hadiyanto ML, Gunadi, Herini ES. The role of whole exome sequencing in the UBE3A point mutation of Angelman Syndrome: A case report. Ann Med Surg (Lond) 2022; 73:103170. [PMID: 34976390 PMCID: PMC8683671 DOI: 10.1016/j.amsu.2021.103170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/04/2021] [Accepted: 12/05/2021] [Indexed: 11/23/2022] Open
Abstract
INTRODUCTION Angelman Syndrome (AS) is a rare disorder with a relatively well-defined phenotype caused by lack of expression of the maternally inherited ubiquitin-protein ligase E3A (UBE3A) gene in the brain. This article describes the role of genetic testing using whole-exome sequencing (WES) in detecting rare AS variants, a point mutation in the UBE3A gene. CASE PRESENTATION We describe a rarely reported clinical presentation of AS in a two year and ten months old girl with severe developmental delay, movement and balance disorder, frequent smiling, apparent happy demeanor, speech impairment, absence of seizure, lack of sleep, and abnormal food-related behavior. Physical examination showed microcephaly, with facial characteristics of AS, ataxia gait, and truncal hypotonia. The electroencephalogram showed medium amplitude rhythmic 2-3c/s. Brain Magnetic Resonance Imaging revealed microcephaly, corpus callosum dysgenesis, and heterotopia grey matter on the bilateral lateral ventricle. WES was conducted to search pathogenic variants and showed a heterozygous mutation in exon 9 of the UBE3A gene, c.1513C > T (p.Arg505Ter). CONCLUSION Angelman syndrome is a neurodevelopmental disorder that has several underlying genetic etiologies. WES could detect a rare variant of Angelman syndrome, identified as the point mutation of the UBE3A gene, which cannot be seen with other modalities.
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Affiliation(s)
- Agung Triono
- Department of Child Health, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Dr. Sardjito Hospital, Yogyakarta, 55281, Indonesia
| | - Kristy Iskandar
- Department of Child Health, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Dr. Sardjito Hospital, Yogyakarta, 55281, Indonesia
- Genetics Working Group, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Dr. Sardjito Hospital, Yogyakarta, 55281, Indonesia
| | - Andika Priamas Nugrahanto
- Department of Child Health, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Dr. Sardjito Hospital, Yogyakarta, 55281, Indonesia
- Genetics Working Group, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Dr. Sardjito Hospital, Yogyakarta, 55281, Indonesia
| | - Marissa Leviani Hadiyanto
- Genetics Working Group, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Dr. Sardjito Hospital, Yogyakarta, 55281, Indonesia
| | - Gunadi
- Genetics Working Group, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Dr. Sardjito Hospital, Yogyakarta, 55281, Indonesia
- Pediatric Surgery Division, Department of Surgery, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Dr. Sardjito Hospital, Yogyakarta, 55281, Indonesia
| | - Elisabeth Siti Herini
- Department of Child Health, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Dr. Sardjito Hospital, Yogyakarta, 55281, Indonesia
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Walker S, Lamoureux S, Khan T, Joynt ACM, Bradley M, Branson HM, Carter MT, Hayeems RZ, Jagiello L, Marshall CR, Meyn MS, Miller SP, Wilson D, Scherer SW, Blaser S, Mireskandari K, Costain G. Genome sequencing for detection of pathogenic deep intronic variation: A clinical case report illustrating opportunities and challenges. Am J Med Genet A 2021; 185:3129-3135. [PMID: 34159711 DOI: 10.1002/ajmg.a.62389] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 05/25/2021] [Accepted: 06/08/2021] [Indexed: 11/09/2022]
Abstract
Variants in JAM3 have been reported in four families manifesting a severe autosomal recessive disorder characterized by hemorrhagic destruction of the brain, subependymal calcification, and cataracts. We describe a 7-year-old male with a similar presentation found by research-based quad genome sequencing to have two novel splicing variants in trans in JAM3, including one deep intronic variant (NM_032801.4: c.256+1260G>C) not detectable by standard exome sequencing. Targeted sequencing of RNA isolated from transformed lymphoblastoid cell lines confirmed that each of the two variants has a deleterious effect on JAM3 mRNA splicing. The role for genome sequencing as a clinical diagnostic test extends to those patients with phenotypes strongly suggestive of a specific Mendelian disorder, especially when the causal genetic variant(s) are not found by a more targeted approach. Barriers to diagnosis via identification of pathogenic deep intronic variation include lack of laboratory consensus regarding in silico splicing prediction tools and limited access to clinically validated confirmatory RNA experiments.
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Affiliation(s)
- Susan Walker
- The Centre for Applied Genomics, The Hospital for Sick Children, Toronto, Ontario, Canada.,Genetics and Genome Biology, Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Sylvia Lamoureux
- The Centre for Applied Genomics, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Tayyaba Khan
- Genetics and Genome Biology, Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Alyssa C M Joynt
- Genetics and Genome Biology, Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Melissa Bradley
- Complex Care Program, The Hospital for Sick Children and Trillium Health Partners, Greater Toronto Area, Ontario, Canada
| | - Helen M Branson
- Department of Diagnostic Imaging, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Melissa T Carter
- Department of Genetics, Children's Hospital of Eastern Ontario, Ottawa, Ontario, Canada.,Department of Pediatrics, University of Ottawa, Ottawa, Ontario, Canada
| | - Robin Z Hayeems
- Child Health Evaluative Sciences, Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada.,Institute of Health Policy Management and Evaluation, University of Toronto, Toronto, Ontario, Canada
| | - Lukasz Jagiello
- Complex Care Program, The Hospital for Sick Children and Trillium Health Partners, Greater Toronto Area, Ontario, Canada
| | - Christian R Marshall
- Division of Genome Diagnostics, The Hospital for Sick Children, Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - M Stephen Meyn
- Center for Human Genomics and Precision Medicine, Department of Pediatrics, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA.,Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
| | - Steven P Miller
- Division of Neurology, The Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Paediatrics, University of Toronto, Toronto, Ontario, Canada
| | - Diane Wilson
- Division of Neonatology, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Stephen W Scherer
- The Centre for Applied Genomics, The Hospital for Sick Children, Toronto, Ontario, Canada.,Genetics and Genome Biology, Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
| | - Susan Blaser
- Department of Diagnostic Imaging, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - Kamiar Mireskandari
- Department of Ophthalmology and Vision Sciences, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
| | - Gregory Costain
- Genetics and Genome Biology, Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada.,Department of Paediatrics, University of Toronto, Toronto, Ontario, Canada.,Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, Toronto, Ontario, Canada
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