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Purpose: The present study investigated associations between dopamine transporter (DAT) availability and α-synuclein levels incerebrospinal fluid, as well as synuclein gene (SNCA) transcripts, and the effect of single nucleotide polymorphism of SNCA onDAT availability in healthy subjects. Materials and Methods: The study population comprised healthy controls who underwent 123I-FP-CIT single-photon emissioncomputed tomography screening. Five SNCA probes were used to target the boundaries of exon 3 and exon 4 (SNCA-E3E4), transcriptswith a long 3’UTR region (SNCA-3UTR-1, SNCA-3UTR-2), transcripts that skip exon 5 (SNCA-E4E6), and the rare shorttranscript isoforms that comprise exons 1–4 (SNCA-007). Results: In total, 123 healthy subjects (male 75, female 48) were included in this study. DAT availability in the caudate nucleus(p=0.0661) and putamen (p=0.0739) tended to differ according to rs3910105 genotype. In post-hoc analysis, DAT availability inthe putamen was lower in subjects of TT genotype than those of CC/CT (p=0.0317). DAT availability in the caudate nucleus alsoshowed a trend similar to that in the putamen (p=0.0597). Subjects of CT genotype with rs3910105 showed negative correlationswith DAT availability in the putamen with SNCA-E3E4 (p=0.037, rho=-0.277), and SNCA-E4E6 (p=0.042, rho=-0.270), but notthose of CC/TT genotypes. Conclusion: This is the first study to investigate the association of rs3910105 in SNCA with DAT availability. rs3910105 had an effecton DAT availability, and the correlation between DAT availability and SNCA transcripts were significant in CT genotypes ofrs3910105.

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