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Strauss AM, Buhle AC, Finkler DM. Heterozygous Deletion of Chromosome 15q13.3 in a Boy with Developmental Regression, Global Developmental Delay, Hypotonia, and Short Stature. Pediatr Rep 2022; 14:528-532. [PMID: 36548204 PMCID: PMC9780927 DOI: 10.3390/pediatric14040061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 11/15/2022] [Accepted: 11/21/2022] [Indexed: 12/09/2022] Open
Abstract
Two causes of intellectual disability are 15q13.3 deletion syndrome and BRWD3 X-linked intellectual disability. 15q13.3 deletion syndrome causes a heterogenous phenotype including intellectual disability (ID), developmental delay (DD), autism spectrum disorder, epilepsy/seizures, schizophrenia, attention deficit hyperactivity disorder, visual defects, hypotonia, and short stature. BRWD3 variants are rare, and the clinical presentation is largely unknown. Presented here is a 34-month-old male with developmental regression, global DD, hypotonia, and short stature. In this study, the patient and his mother underwent a whole-genome array screening. Sorting intolerant from tolerant (SIFT) and polymorphism phenotyping v2 (PolyPhen-2) analyses were performed to determine the pathogenicity of the BRWD3 mutation. Array comparative genomic hybridization showed a heterozygous, pathogenic deletion of at least 1.6 Mb from the cytogenetic band 15q13.2q13.3 and a BRWD3 variant of unknown clinical significance. This combination of genetic mutations has never been reported together and neither disorder is known to cause developmental regression. The mechanism of developmental regression is undefined but is of great importance due to the opportunity to develop therapies for these patients.
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Affiliation(s)
- Allison M. Strauss
- Virginia Tech Carilion School of Medicine, Roanoke, VA 24016, USA
- Correspondence:
| | - Anna C. Buhle
- Virginia Tech Carilion School of Medicine, Roanoke, VA 24016, USA
| | - David M. Finkler
- Virginia Tech Carilion School of Medicine, Roanoke, VA 24016, USA
- Department of Pediatrics, Carilion Clinic, Roanoke, VA 24014, USA
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Whitney R, Nair A, McCready E, Keller AE, Adil IS, Aziz AS, Borys O, Siu K, Shah C, Meaney BF, Jones K, RamachandranNair R. The spectrum of epilepsy in children with 15q13.3 microdeletion syndrome. Seizure 2021; 92:221-229. [PMID: 34601452 DOI: 10.1016/j.seizure.2021.09.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 09/02/2021] [Accepted: 09/23/2021] [Indexed: 12/31/2022] Open
Abstract
PURPOSE To further define the epilepsy phenotype in a cohort of children with 15q13.3 microdeletion syndrome. METHODS We retrospectively reviewed the phenotypic spectrum of all children aged < 18 years with epilepsy and 15q13.3 microdeletion syndrome. RESULTS Thirteen children were included, 69% were female. The median age of children in the cohort was 12 years (age range: 3 years-15 years). Median age at seizure onset was 4 years. Eleven children (85%) had intellectual disability. Nine of 13 children (69%) had a history of typical absence seizures with median age of onset at 5 years (2 had absence status epilepticus). Thirty-one percent (4/13) had focal with impaired awareness non-motor onset seizures. ILAE recognized absence epilepsy syndromes were diagnosed in 6/13 (46%). The remainder were classified as having genetic generalized epilepsies with overlap clinical features, combined or focal epilepsies. Electroencephalogram in the cohort showed generalized (85%) and focal epileptiform discharges (62%) and posterior dominant rhythm slowing (33%). One child had electrical status epilepticus of sleep. Neuroimaging was performed in 5 children (38%) and revealed abnormal findings in 3. Seizures were drug resistant in a third of the cohort. Valproate resulted in seizure freedom in 5 (42%). Oxcarbazepine caused clinical worsening in one child with combined seizure types. Two children tried cannabidiol and one tried the ketogenic diet; neither was effective. CONCLUSIONS The epilepsy phenotype in children with 15q13.3 microdeletion syndrome is defined by childhood onset absence seizures, and may have atypical features such as, early onset absences, persistence into adolescence, status epilepticus, intellectual disability and treatment resistance. Focal seizures and focal EEG findings may be observed and should be treated cautiously, given the possibility of combined seizure types. Valproate appeared effective, although other treatments must be explored further.
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Affiliation(s)
- Robyn Whitney
- Division of Neurology, Department of Paediatrics, McMaster University, Hamilton, ON, Canada.
| | - Arjun Nair
- Division of Neurology, Department of Paediatrics, McMaster University, Hamilton, ON, Canada
| | - Elizabeth McCready
- Division of Clinical Pathology, Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Anne E Keller
- Division of Neurology, Department of Paediatrics, McMaster University, Hamilton, ON, Canada
| | - Ishita Siddiq Adil
- Pediatric Neurology Clinic, Oakville, ON, Canada; Division of Neurology, Department of Paediatrics, University of Toronto, Toronto, ON, Canada
| | - Aly Shah Aziz
- Division of Neurology, Department of Paediatrics, McMaster University, Hamilton, ON, Canada; Pediatric Neurology Clinic, Oakville, ON, Canada
| | - Oksana Borys
- Division of Neurology, Department of Paediatrics, McMaster University, Hamilton, ON, Canada; Pediatric Neurology Clinic, Oakville, ON, Canada
| | - Kaitlyn Siu
- Division of Neurology, Department of Paediatrics, McMaster University, Hamilton, ON, Canada
| | - Chintan Shah
- Division of Neurology, Department of Paediatrics, McMaster University, Hamilton, ON, Canada
| | - Brandon F Meaney
- Division of Neurology, Department of Paediatrics, McMaster University, Hamilton, ON, Canada
| | - Kevin Jones
- Division of Neurology, Department of Paediatrics, McMaster University, Hamilton, ON, Canada
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