Table 1.

Investigated candidate genes

GeneGene locationPolymorphism/ reference no.Polymorphism locationGene function
UTR = untranslated region.
DRD15q34−48 A/G35′UTRPostsynaptic transmission
DRD211q22.3-q23Ser311Cys4Exon 7Postsynaptic transmission
DRD33q13.3Ser9Gly5Exon 1Postsynaptic transmission
DRD411p15.5−521 C/T6Promoter regionPostsynaptic transmission
DRD54p15.1-p16.1Pro326Pro7Exon 1Postsynaptic transmission
DAT5p15.3VNTR 40bp83′ UTRPresynaptic uptake
TH11p15.5Val81Met9Exon 2Dopamine synthesis
DBH9q34444 G/A10Exon 2Dopamine catabolism