The Role of DNA Methylation and Activity of Neurotransmitter Receptors in the Mechanisms of Specific Anterograde Amnesia and Memory Recovery.

Impairment of reconsolidation of conditioned food aversion memory led to the development of a specific anterograde amnesia: repeated training of amnestic snails did not induce long-term memory formation. DNA demethylation caused by injections of DNA methyltransferase inhibitor (DNAMT) during repeated training led to long-term memory formation. Injections of an NMDA glutamate receptor antagonist or a serotonin receptor antagonist prevented memory formation induced by administration of DNAMT inhibitor and repeated training. We hypothesize that methylation-dependent repression of neuronal genes underlies anterograde amnesia. Demethylation eliminated the blockade of these genes and created conditions for long-term memory formation, the induction mechanisms of which involve neurotransmitter receptors.