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Background and Objectives  To date, all reports of pathogenic variants affecting the GTPase domain of the  DNM1  gene have a clinically severe neurodevelopmental phenotype, including severe delays or intractable epilepsy. We describe a case with moderate developmental delays and self-resolved epilepsy.    Methods  The patient was followed by our neurology and genetics teams. After clinical examination and EEG to characterize the patient's presentation, we conducted etiologic workup including brain MRI, chromosomal microarray, genetic and metabolic investigations, and nerve conduction studies. Subsequently, we arranged an Intellectual Disability Plus Trio Panel.    Results  Our patient presented with seizures at 2 days old, requiring phenobarbital. She also had hypotonia, mild dysmorphic features, and mild ataxia. Although initial workup returned unremarkable, the trio gene panel identified a de novo heterozygous pathogenic missense variant in the  DNM1  GTPase domain. Now 4 years old, she has been seizure-free for 3 years without ongoing treatment and has nonsevere developmental delays (e.g., ambulates independently and speaks 2-word phrases).    Discussion  Our case confirms that not all individuals with  DNM1  pathogenic variants, even affecting the GTPase domain, will present with intractable epilepsy or severe delays. Expanding the known clinical spectrum of dynamin-related neurodevelopmental disorder is crucial for patient prognostication and counseling.

Pathogenic DNM1 Gene Variant Presenting With Unusually Nonsevere Neurodevelopmental Phenotype: A Case Report