KCNH1 and Townes-Brocks syndrome: Clinically, variants in KCNH1 have been associated with Temple‐Baraitser syndrome (TBS, OMIM# 611816) and Zimmermann‐Laband syndrome (ZLS, OMIM# 135500), two forms of neurodevelopmental disorder charactered by intellectual disability (ID), developmental disorder (DD), coarse face, gingival overgrowth, hypertrichosis, digital/toe anomalies, and seizures.5, 6, 7, 8, 9