KCTD17 and Cognitive impairment: Although autosomal dominant KCTD17 mutations cause less severe disease than bi‐allelic KCTD7 mutations discussed in section 3.1, both KCTD7 and KCTD17 disorders have some overlapping clinical features including difficulty swallowing, impaired verbal skills, cognitive impairment, difficulties with fine motor skills, and their disease is progressive, unlike SGCE mutations.