A recent study has found significant DNA methylation changes in the early stages of development and suggest that aberrant DNA methylation during the transition from the fetal to the postnatal period of development could be critical for the pathogenesis of schizophrenia.43 Genes that are differentially methylated from fetal to neonatal life stage include DRD2, NOS1, SOX10 and DNMT1, all of which have been previously found to be associated with schizophrenia. This evidence concerns the gene NOS1 and schizophrenia.