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Objective
The postsynaptic density protein of excitatory neurons PSD‐95 is encoded by discs large MAGUK scaffold protein 4 (DLG4), de novo pathogenic variants of which lead to DLG4‐related synaptopathy. The major clinical features are developmental delay, intellectual disability (ID), hypotonia, sleep disturbances, movement disorders, and epilepsy. Even though epilepsy is present in 50% of the individuals,...
Mutations in GNAO1 have been described in 11 patients to date. Although most of these individuals had epileptic encephalopathy, four patients had a severe movement disorder as the prominent feature. We describe the largest series of patients with de novo GNAO1 mutations who have severe chorea, developmental delay, and hypotonia in the absence of epilepsy.Six patients with recurrent missense mutations...
We discuss the case of a teenage girl who presented with neurologic symptoms suggestive of a peripheral neuropathy, before the development of a central arteriovenous fistula. Electromyography and nerve conduction studies indicated peroneal motor neuropathy, but her comprehensive genetic study results were negative for common Charcot-Marie-Tooth mutations. After 2 years of stable symptoms, she presented...
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