De novo 5q14.3 translocation 121.5-kb upstream of MEF2C in a patient with severe intellectual disability and early-onset epileptic encephalopathy
✍ Scribed by Hirotomo Saitsu; Noboru Igarashi; Mitsuhiro Kato; Ippei Okada; Tomoki Kosho; Osamu Shimokawa; Yuki Sasaki; Kiyomi Nishiyama; Yoshinori Tsurusaki; Hiroshi Doi; Noriko Miyake; Naoki Harada; Kiyoshi Hayasaka; Naomichi Matasumoto
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 313 KB
- Volume
- 155
- Category
- Article
- ISSN
- 1552-4825
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✦ Synopsis
Abstract
Recent studies have shown that haploinsufficiency of MEF2C causes severe intellectual disability, epilepsy, hypotonia, and cerebral malformations. We report on a female patient with severe intellectual disability, early‐onset epileptic encephalopathy, and hypoplastic corpus callosum, possessing a de novo balanced translocation, t(5;15)(q13.3;q26.1). The patient showed upward gazing and tonic seizure of lower extremities followed by generalized clonic seizures at 4 months of age. Electroencephalogram showed hypsarrhythmia when asleep. By using fluorescent in situ hybridization (FISH), southern hybridization and inverse PCR, the translocation breakpoints were determined at the nucleotide level. The 5q14.3 breakpoint was localized 121.5‐kb upstream of MEF2C. The 15q26.2 breakpoint was mapped 119‐kb downstream of LOC91948 non‐coding RNA. We speculate that the translocation may disrupt the proper regulation of MEF2C expression in the developing brain, resulting in severe intellectual disability and early‐onset epileptic encephalopathy. © 2011 Wiley Periodicals, Inc.