18p-deletion was reported to be associated with DYT7. 31,32 This association was recently challenged.33 The 4 olfactory genes (OR4X1, OR4X2, OR4S1, and OR4B1) are universally expressed in brain and ORB1 is highly expressed in striatum as well (Allen Brain Atlas34). Here, OR4X2 is linked to torsion dystonia 7.