GNAO1 and movement disorder: However, in a few atypical, milder cases, with movement disorder onset in late childhood or adolescence, no acute exacerbation and less‐severe disability have been identified using next‐generation sequencing techniques.8, 9, 10 In this study, we characterized the clinical and genetic features of a cohort of patients with mild GNAO1‐related phenotype characterized by prominent movement disorders, further expanding the spectrum of this condition.