Focal or segmental HMD was observed in only 32/140 (23%) patients with SGCE, SLC2A1, ADCY5, and atypical, later‐onset neurotransmitters disorders (GCH1, SLC6A3, DDC, PTPS, and SPR). This evidence concerns the gene SLC2A1 and hereditary mucoepithelial dysplasia.