Chemar,

As you know, I do not have a scientific background, so my attempt to answer your question is weak and figuratively speaking, it makes my head hurt. But here is my best shot. It is not an answer but a hint of a direction that might or might not be worth exploring further.

The best I can do is to establish a connection between dopamine and T-cells (The Marshall protocol was developed to treat certain diseases that involve Th1 immune system dysfunction). Here is some evidence that they are connected, at least in one direction:

http://www.fasebj.org/cgi/reprint/18/13/1600.pdf

Please note that this relationship has something to do with regulation by G-proteins (Gi and Gs). I do know that G protein processing defects can be inherited. This doesn't prove anything about Tourette's syndrome and mycoplasmas, but I hope this information will be of some use to you.