Abstract: Abstract: Persistent addictive memory has been one of the potential reasons to relapse. But the molecular mechanism of addictive memory is not clear. Epigenetic mechanism may be one of the potential substrates to keep the addictive memory persistent. And it has been established that drug of abuse can modify the chromatin structures through histone acetylation and DNA methylation, and further modulate gene expression underlying long-term neural plasticity. And the epigenetic mechanism of memory reconsolidation involved memory promoting and suppressing genes will be an attractive field in the future

Key words: addiction, epigenetics, Histone acetylation, DNA methylation