The present invention provides a method of identifying one or more epigenetic markers associated with psychosis-associated diseases such as bipolar disease or schizophrenia, the method comprising a) obtaining a first group of samples comprising genomic DNA from a plurality of bipolar or schizophrenic subjects and a second group of samples comprising genomic DNA from a plurality of control subjects; b) performing DNA methylation analysis to determine methylation differences in one or more DNA regions between the first group and second group of samples, wherein a methylation difference in a DNA region is indicative of an epigenetic marker associated with bipolar disease or schizophrenia. The invention also provides one or more epigenetic markers associated with psychosis-associated diseases such as bipolar disease or schizophrenia.
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