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ID 118474
Author
Sakamoto, Masamune Yokohama City University
Tayama, Takahiro Tokushima University
Goji, Aya Tokushima University
Toda, Yoshihiro Tokushima University
Fujita, Atsushi Yokohama City University
Mizuguchi, Takeshi Yokohama City University
Matsumoto, Naomichi Yokohama City University
Keywords
Epilepsy with myoclonic atonic seizures (EMAtS)
SLC6A1
Balanced chromosomal translocation
Long-read sequencing
Content Type
Journal Article
Description
Introduction
Epilepsy with myoclonic atonic seizures (EMAtS) was previously thought to occur in normally developing children. We report a female case of EMAtS and mild developmental delay before onset. Importantly, a de novo balanced chromosomal translocation was recognized in the patient.
Case presentation
The patient was a 4-year-old girl. Mild developmental delay was observed during infancy. At the age of one and a half years, she developed atonic seizures once a month. At 4 years of age, her seizures increased to more than 10 times per hour. An ictal electroencephalogram (EEG) showed a 3–4-Hz spike-and-wave complex, which was consistent with atonic and myoclonic seizures of the trunk, eyelids, and lips. Therefore, EMAtS was diagnosed based on the symptoms and EEG findings. After administration of valproic acid (VPA), the epileptic seizures disappeared immediately. At the age of 5 years and 2 months, the seizures recurred but disappeared again when the dose of VPA was increased. Subsequently, no recurrence was observed until 6 years and 3 months of age on VPA and lamotrigine. Chromosome analysis of the patient disclosed 46,XX,t(3;11)(p25;q13.1)dn. Long-read sequencing of the the patient’s genomic DNA revealed that the 3p25.3 translocation breakpoint disrupted the intron 7 of the SLC6A1 gene.
Conclusion
The SLC6A1 disruption by chromosome translocation well explains the clinical features of this patient. Long-read sequencing is a powerful technique to determine genomic abnormality at the nucleotide level for disease-associated chromosomal abnormality.
Journal Title
Brain and Development
ISSN
03877604
18727131
NCID
AA00111153
AA11521714
Publisher
The Japanese Society of Child Neurology|Elsevier
Volume
45
Issue
7
Start Page
395
End Page
400
Published Date
2023-03-23
Rights
© 2023. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
Author
departments
University Hospital