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). The gene discussed is OR4B1; the disease is torsion dystonia 7.