Paula,

There is an excellent article at Medcape Today with info on genetics involved.
You are right in that it can be caused by organophosphate pesticide poisoning, but all I see is that results in respiratory paralysis if patient is given succynilcholine (whatever that is). I didn't see anywhere that it causes
Parkinsonism.

http://emedicine.medscape.com/article/247019-overview

Is there for sure a test for this? Didn't see anything on it at 23 and me.

Laura