This is probably a shot in the dark but....

I uploaded my DNA to Promthease and received some interesting information but nothing about a specific gene that my family carries, which is Waardenburg Syndrome. This syndrome causes deafness, among other things. I have it and so do my mother, sister, aunt, grandaunt and possibly my grandpa's first cousin who was Deaf. Would anyone know what SNP I should look for for this specific gene, or direct me to someone who specialize in this kind of thing? We are really interested to find out where specifically this gene came from.
Thanks!