<qa>  What is the name of the earliest mutation in Ashkenazi Jews?14. Bressman SB, de Leon D, Kramer PL, Ozelius LJ, Brin MF, Greene PE, Fahn S, Breakefield XO, Risch NJ. Dystonia in Ashkenazi Jews: Clinical characterization of a founder mutation. Ann Neurol 1994; 36: 771-777. 