I like this question thrown open. I am not so sure, but I have perception that many chemical agents alters epigenetically. In fact, I was not surprised when I once read sometimes ago that obesity is largely driven by chocolates and co which fill our markets today, epigenetically. So, in this background regarding your question, unless I get you better the system in which the drug is to be used. Generally, histone methylation is affected by myriads of chemical agents