If mercury inhibits 21 Hydroxylase enzyme then the cause for that would be more of an  exogenous influence than endogenous would it not?  In other words, something that could affect anyone and not be hereditary?  21 Hydroxylase deficiency is generally inherited at conception due to faulty genetics.  I did find something on medline about mercury poisoning but I  but havn’t had time to study it and the symptoms.  You’ve raised my interest though.  When I have some more time I’ll read into it.  Here is something of interest about mercury poisoning though but it doesn’t mention adrenal problems as such.  Some of the symptoms for mercury poisoning (mental and physical) are here:

http://www.vaccinationnews.com/Scandals/Feb_15_02/mercury_poisoning.htm

http://www.emedicine.com/derm/topic592.htm

After reading those symptoms I guess that it could actually be possible to be honest in varying degrees I guess.