SLC2A1 and GLUT1 deficiency syndrome: Mutations in the gene solute carrier family 2 member 1 (SLC2A1; OMIM#138140) encoding the glucose transporter, GLUT-1, are known to cause the Glut1 deficiency syndrome (Glut1DS, OMIM#606777) mainly characterized by intellectual disability, seizures and ataxia, leading to a wide range of phenotypes clinically overlap between Glut1DS and AHC patients.[56]