DUSP22 and schizophrenia: The genome-wide methylation analysis of the Chinese famine sample identified one single region containing the dual specificity phosphatase 22 (DUSP22) gene promoter with higher DNA methylation levels in the famine-exposed schizophrenia patients compared to all other groups (Chr6: 291687-293285, Family Wise Error Rate (FWER) = 0.01).