Less severe phenotypes of GLUT1-DS are also observed, such as paroxysmal exertion-induced dyskinesia, and there are likely to be undiagnosed GLUT1-related conditions [36] (Anand et al., 2011) involving milder GLUT alteration or glycolytic deficiency variants that might underlie other neurological diseases [20] (Barros et al., 2017). The gene discussed is SLC2A1; the disease is hyperinsulinemic hypoglycemia, familial, 4.