{{Rsnum
|rsid=841
|Gene=GCH1
|Chromosome=14
|position=54843774
|Orientation=minus
|GMAF=0.2672
|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 | 51.4 | 44.1 | 4.5
| HCB | 41.9 | 44.1 | 14.0
| JPT | 37.0 | 45.4 | 17.6
| YRI | 55.6 | 39.6 | 4.9
| ASW | 54.5 | 41.8 | 3.6
| CHB | 41.9 | 44.1 | 14.0
| CHD | 44.4 | 43.5 | 12.0
| GIH | 71.0 | 27.0 | 2.0
| LWK | 56.5 | 38.9 | 4.6
| MEX | 40.0 | 52.7 | 7.3
| MKK | 48.7 | 38.3 | 13.0
| TSI | 74.5 | 23.5 | 2.0
| HapMapRevision=28
}}{{PMID Auto
|PMID=20581851
|Title=Exploring epistatic relationships of NO biosynthesis pathway genes in susceptibility to CHD
}}

{{PMID Auto
|PMID=21963893
|Title=Polymorphisms of genes in nitric oxide-forming pathway associated with ischemic stroke in Chinese Han population
}}

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

{{PMID Auto
|PMID=19775452
|Title=Do genetic predictors of pain sensitivity associate with persistent widespread pain?
|OA=1
}}

{{PMID Auto
|PMID=21896313
|Title=Functional polymorphism of the GTP cyclohydrolase 1 gene affects the personality trait of novelty seeking in healthy subjects.
}}

{{PMID Auto
|PMID=22770721
|Title=GTP cyclohydrolase 1 gene haplotypes as predictors of SSRI response in Japanese patients with major depressive disorder
}}

{{PMID Auto
|PMID=23246742
|Title=Association of monoamine-synthesizing genes with the depression tendency and personality in chronic fatigue syndrome patients.
}}

{{PMID Auto
|PMID=23322459
|Title=Association of guanosine triphosphate cyclohydrolase 1 gene polymorphisms with fibromyalgia syndrome in a Korean population.
}}

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