{{Rsnum
|rsid=12718541
|Gene=DDC
|Chromosome=7
|position=50482446
|Orientation=plus
|GMAF=0.4633
|Gene_s=DDC
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|geno1=(A;A)
|geno2=(A;G)
|geno3=(G;G)
}}{{ population diversity
| geno1=(A;A)
| geno2=(A;G)
| geno3=(G;G)
| CEU | 16.9 | 52.5 | 30.5
| HCB | 36.4 | 36.4 | 27.3
| JPT | 24.4 | 58.5 | 17.1
| YRI | 24.1 | 55.2 | 20.7
| ASW | 0.0 | 0.0 | 0.0
| CHB | 36.4 | 36.4 | 27.3
| 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
}}{{PMID Auto
|PMID=16740595
|Title=Intronic variants in the dopa decarboxylase (DDC) gene are associated with smoking behavior in European-Americans and African-Americans
}}

{{PMID Auto
|PMID=19184136
|Title=Examination of association of genes in the serotonin system to autism.
|OA=1
}}

{{on chip | 23andMe v3}}
{{on chip | 23andMe v4}}
{{on chip | FTDNA2}}
{{on chip | HumanOmni1Quad}}