Table 2.
Overview of the selected dopamine genes, specific SNP, samples sizes and available samples.
| Gene | Polymorphism | Samples | Total N | Nations |
|---|---|---|---|---|
| DAT1 | rs28363170 (‘3 40 bp VNTR) | 265 | 43,502 | 46 |
| DRD2 | rs1800497 (Taq1A) | 388 | 65,617 | 59 |
| DRD2 | rs1079597 (Taq1B) | 199 | 15,785 | 55 |
| DRD2 | rs1800498 (Taq1D) | 120 | 10,814 | 37 |
| DRD2 | rs6275 (C939T) | 122 | 10,404 | 46 |
| DRD2 | rs6277 (C957T) | 114 | 20,375 | 46 |
| DRD2 | rs1799732 (141 C in/del) | 91 | 19,074 | 35 |
| DRD3 | rs6280 (ser9gly) | 237 | 28,796 | 63 |
| DRD4 | rs1800955 (C521T) | 72 | 13,795 | 32 |
Note: Total N and number of studies varies due to multiple samples including more than one SNP.