{{Rsnum
|rsid=4331145
|Gene=DRD4
|Chromosome=11
|position=643683
|Orientation=minus
|GMAF=0.4481
|Assembly=GRCh37
|GenomeBuild=37.1
|dbSNPBuild=131
|geno1=(A;A)
|geno2=(A;G)
|geno3=(G;G)
}}
{{ population diversity
| geno1=(A;A)
| geno2=(A;G)
| geno3=(G;G)
| CEU | 27.7 | 56.9 | 15.4
| HCB | 2.2 | 33.3 | 64.4
| JPT | 6.8 | 31.8 | 61.4
| YRI | 0.0 | 0.0 | 0.0
| ASW | 0.0 | 0.0 | 0.0
| CHB | 2.2 | 33.3 | 64.4
| CHD | 0.0 | 0.0 | 0.0
| GIH | 0.0 | 0.0 | 0.0
| LWK | 0.0 | 0.0 | 0.0
| MEX | 0.0 | 0.0 | 0.0
| MKK | 0.0 | 0.0 | 0.0
| TSI | 0.0 | 0.0 | 0.0
| HapMapRevision=28
}}
Associated with [[schizophrenia]] in a study of Croatians. Due to the limited number and diversity of the studied population, more study is needed to confirm any link. The G allele was associated with a decreased risk of schizophrenia. {{PMID|19673036|OA=1
}}

{{PMID Auto
|PMID=21874733
|Title=Comparative study on gene tags of the neurotransmission system in schizophrenic and suicidal subjects
}}

{{on chip | 23andMe v2}}
{{on chip | 23andMe v3}}
{{on chip | 23andMe v4}}
{{on chip | HumanOmni1Quad}}