Antiquitin deficieny; CDG Type I; Cerebral Folate Deficiency; Cerebrotendinöse Xanthomatose; Glut1 Deficiency; Glycine Encephalopathy / non-ketotic hyperglycinemia; lysinuric protein intolerance; M. Alexander; NCL; Niemann-Pick C; OTC deficiency; PDH deficiency; Pyridoxalphosphat dependent epilepsy; Pyridoxine dependent epilepsy; 5-Hydroxytryptophan deficiency. This evidence concerns the gene SLC2A1 and neurodegenerative syndrome due to cerebral folate transport deficiency.