SLC6A3 and Parkinson disease: Among Japanese PD patients, no evidence of association between the 1215A/G polymorphism in DAT gene and PD was found in one study (Kimura, Matsushita, Arai, Takeda, & Higuchi, 2001), while such association was confirmed in two others (Morino et al., 2000; Nishimura, Kaji, Ohta, Mizuta, & Kuno, 2002) and the 10‐copy genotype of 40‐pb VNTR polymorphism in that gene was suggested to make a protective factor for the development of PD in male Taiwanese (Lin et al., 2003).