{{Rsnum
|rsid=12147422
|Gene=GCH1
|Chromosome=14
|position=54877297
|Orientation=plus
|GMAF=0.2511
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|geno1=(C;C)
|geno2=(C;T)
|geno3=(T;T)
|Gene_s=GCH1
}}{{ population diversity
| geno1=(C;C)
| geno2=(C;T)
| geno3=(T;T)
| CEU | 3.1 | 17.2 | 79.7
| HCB | 20.0 | 55.6 | 24.4
| JPT | 11.4 | 43.2 | 45.5
| YRI | 19.0 | 47.6 | 33.3
| ASW | 0.0 | 0.0 | 0.0
| CHB | 20.0 | 55.6 | 24.4
| 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
}}[http://www.nebh.org/Documents/Content/R-PE_KimResSymposCOMTandGCH1Abstract.pdf Polymorphic Variation of the COMT and GCH1 Genes In Patients Undergoing Surgical Treatment For Lumbar Degenerative Disc Disease]

{{PMID|17343757|OA=1
}} Lack of influence of GTP cyclohydrolase gene (GCH1) variations on pain sensitivity in humans.

{{on chip | 23andMe v1}}
{{on chip | 23andMe v2}}
{{on chip | 23andMe v3}}
{{on chip | 23andMe v4}}