A fragment spanning −1990 to +10 of DRD1 was amplified to confirm and elucidate the haplotype structure for 5′ promoter region.
Normalized luciferase activities of nine cloned haplotypes (H2–H9) were compared with the common haplotype (H1) after transfecting SH-SY5Y and HEK293 cells.
In SH-SY5Y cell, there were significant differences between H2–H9 and H1, respectively.
In HEK293 cell, no significant difference was observed among them except H8.