TUBB4A and Dystonia: Other genes found to be associated with isolated or combined dystonia include ANO3 (DYT24), TUBB4A (DYT4), GCH1 (DYT5a), TH (DYT5b), TAF1 (DYT3), PRKRA (DYT16), ATP1A3 (DYT12), SGCE (DYT11), KCTD17, and CACNA1A [4–8].