DNMT1 and schizophrenia: This study used linkage disequilibrium analysis to identify an absolute linkage block between rs2114724 and rs2228611 in DNMT1 and the four loci in DNMT3B. These loci were significantly correlated with positive symptoms of schizophrenia, including hallucinatory behavior, suspicion/persecution, motor retardation, and preoccupation.