{{Rsnum
|rsid=998259
|Gene=GCH1
|Chromosome=14
|position=54888313
|Orientation=plus
|GMAF=0.1139
|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 | 61.9 | 30.1 | 8.0
| HCB | 100.0 | 0.0 | 0.0
| JPT | 100.0 | 0.0 | 0.0
| YRI | 100.0 | 0.0 | 0.0
| ASW | 87.7 | 12.3 | 0.0
| CHB | 100.0 | 0.0 | 0.0
| CHD | 0.0 | 0.0 | 0.0
| GIH | 91.1 | 8.9 | 0.0
| LWK | 0.0 | 0.0 | 0.0
| MEX | 56.9 | 36.2 | 6.9
| MKK | 96.2 | 3.8 | 0.0
| TSI | 64.7 | 30.4 | 4.9
| HapMapRevision=28
}}Polymorphic Variation of the Guanosine Triphosphate Cyclohydrolase 1 Gene Predicts Outcome in Patients Undergoing Surgical Treatment for Lumbar Degenerative Disc Disease{{PMID|20838263}}

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

{{on chip | 23andMe v1}}
{{on chip | 23andMe v2}}
{{on chip | 23andMe v3}}
{{on chip | 23andMe v4}}
{{on chip | Affy GenomeWide 6}}
{{on chip | FTDNA2}}
{{on chip | FTDNA}}