MONDO_0044326 (developmental delay and seizures with or without movement abnormalities) can be described as follows. DEDSM is a neurodevelopmental disorder characterized by global developmental delay, variable intellectual disability, and early-onset seizures with a myoclonic component. Most patients have delayed motor development and show abnormal movements, including ataxia, dystonia, and tremor (summary by {1:Hamdan et al., 2017}).