KMT2B and Dystonia: The etiology of dystonia within the group of inherited dystonia was classified as follows: DYT-TOR1A (n = 3), DYT-KMT2B (n = 1), DYT-SGCE (n = 1), DYT-PRKRA (n = 1), DYT-ANO3 (n = 1), GNAO1 gene mutations (n = 2).