In contrast, schizophrenia GWAS have identified hundreds of risk loci, with a strong emphasis on genes related to neuronal and synaptic function, including neurexin 1 (NRXN1), calcium voltage-gated channel subunit alpha1 C (CACNA1C), and glutamate ionotropic receptor N-methyl-D-aspartate type subunit 2A (GRIN2A) [24,25]. This evidence concerns the gene NRXN1 and schizophrenia.