Altered serotonin 2C receptor RNA splicing in suicide: association with editing.

In an earlier study, we showed increases in serotonin 2C receptor (5-HT2CR) pre-mRNA editing in prefrontal cortex that were specific to suicide victims irrespective of associated psychiatric diagnoses. Here we demonstrate that the ratio between the two 5-HT2CR splice variants is increased in people who committed suicide, but does not vary among the diagnostic groups. This provides further evidence for suicide-specific neurobiology and suggests that, as it was previously shown in vitro, 5-HT2CR editing modulates its splicing in human brain. The association analysis indicates, however, that the efficiency of 5-HT2CR editing is an imperfect predictor of the splicing outcome, and that splice site selection is only partially controlled by the level of editing in vivo.