The authors examined the hypothesis of disordered transmethylation in schizophrenia by comparing S-adenosylmethionine (SAMe) concentration and cathechol-O-methyltransferase (COMT) activities in venous blood of schizophrenic and nonschizophrenic patients. While they did not find a difference in blood SAMe concentration between the groups, they did find a significant correlation between blood COMT activity and SAMe concentration. This suggests that some schizophrenics may methylate biogenic amines more actively than others.Abstract Teaser