Todd,
My apologies. Not sure how I missed your post from a few weeks back.
I think overmethylation does occur. It is either overmethylation or increased enzyme and receptor sensitivity to methylation.
Clostridia toxin HPHPA, which is known to inhibit dopamine-beta hydroxylase, has been linked to some cases of schizophrenia. Blocking this enzyme increases dopamine. Whether that alone is the whole story is debatable, but it certainly seems to exacerbate in some situations.
Sincerely,
Dr. Woeller