{{Rsnum
|rsid=7142517
|Gene=GCH1
|Chromosome=14
|position=54840086
|Orientation=plus
|GMAF=0.208
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|geno1=(A;A)
|geno2=(A;C)
|geno3=(C;C)
}}{{ population diversity
| geno1=(A;A)
| geno2=(A;C)
| geno3=(C;C)
| CEU | 12.4 | 42.5 | 45.1
| HCB | 8.8 | 34.3 | 56.9
| JPT | 0.0 | 20.4 | 79.6
| YRI | 0.0 | 1.4 | 98.6
| ASW | 0.0 | 14.0 | 86.0
| CHB | 8.8 | 34.3 | 56.9
| CHD | 11.9 | 38.5 | 49.5
| GIH | 6.9 | 43.6 | 49.5
| LWK | 0.0 | 9.1 | 90.9
| MEX | 5.2 | 34.5 | 60.3
| MKK | 0.6 | 23.7 | 75.6
| TSI | 10.8 | 40.2 | 49.0
| 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|17343757|OA=1
}} Lack of influence of GTP cyclohydrolase gene (GCH1) variations on pain sensitivity in humans.

{{PMID|17903300|OA=1
}} Genome-wide association to body mass index and waist circumference: the Framingham Heart Study 100K project.

{{on chip | 23andMe v1}}
{{on chip | 23andMe v2}}
{{on chip | 23andMe v3}}
{{on chip | 23andMe v4}}
{{on chip | FTDNA2}}
{{on chip | FTDNA}}
{{on chip | HumanOmni1Quad}}
{{on chip | Illumina Human 1M}}