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Identification of a Novel Mutation in GRIN2A Gene with Global Developmental Delay and Refractory Epilepsy.
Annals of Indian Academy of Neurology 2020 September
We report a 2.5-year-old Turkish boy who first presented with nystagmus, lack of eye contact, and hypotonia at 2 months of age and developed refractory seizures when 6 months old. Extensive metabolic tests and imaging being noncontributory, whole-exome sequencing was carried out which revealed a heterozygote NM_001134407.2:C.3299A>G (p.Glu1100Gly) novel mutation in GRIN2A gene. Topiramate was started and seizures were rapidly brought under control. GRIN2A mutations may result in altered GluN2A membrane trafficking and response to glutamate. This report illustrates the clinical variability of GRIN2A mutations according to the age of onset of symptoms and suggests considering mutations in this gene in cases of global developmental delay, refractory epilepsy, and nystagmus.
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