Loss of striatal dopamine transporter (DAT) binding on single photon emission computed tomography (DAT‐SPECT) indicates imminent phenoconversion.14, 15 In addition, RBD subjects with baseline hyposmia have a high risk of developing PD/DLB within 5 years of follow‐up.16, 17. Here, SLC6A3 is linked to Parkinson disease.