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Simple sequence repeats (variable number tandem repeats and insertion/deletions)
| Gene | Polymorphism | Variant alleles | Risk alleles |
|---|---|---|---|
| Dopamine D4 receptor DRD4 | rs761010487 | 48bp repeat 2R-11R | ≥ 7R, long form |
| Dopamine active transporter DAT1 | rs28363170 | 40p repeat 3R-11R | <9R |
| Monoamine oxidase A MAOA | rs768062321 | 30bp repeat 2R-5R | 3.5R, 4R, 5R |
|
Serotonin transporter SLC6A4 (5-HTTLPR) |
rs4795541, rs25531 |
43bp repeat, with SNP L/XL and S, G/A | S, LG |
