Of note, allelic disorders with overlapping features include GLUT1 deficiency syndrome with pseudohyperkalemia and hemolysis, GLUT1 deficiency syndrome-2 (GLUT1DS2), dystonia-9 (DYT9), and idiopathic generalized epilepsy-12 (EIG12) (https://www.omim.org, accessed on 20 April 2022). The gene discussed is SLC2A1; the disease is dystonia 9.