Some of these genes have been genetically associated with schizophrenia, namely neuroplastin (Nptn/Sdfr1), numb homolog (Drosophila)-like (Numbl), proteolipid protein 1 (Plp1), gamma-aminobutyric acid (GABA) A receptor, α1 (Gabra1), and reticulon 4 (Rtn4/(NogoA) [71-75]. This evidence concerns the gene PLP1 and schizophrenia.