GRM4 and epilepsy: Fourteen of the identified genes including ATXN1, MEIS2, KDM1A, GRM4, PAFAH1B1, CDH22 and AUTS2 are linked to neurodevelopment and neurological disorders such as autism, obsessive compulsive disorder, epilepsy, schizophrenia, mental retardation, KBG syndrome and Miller–Dieker syndrome (Fig. 10)21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34.