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GCH1

Chr 14q22.2

GTP cyclohydrolase 1

Aliases:
GTPCH1, DYT5a
MANE:
ENST00000491895.7

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Predicted protein structure

Clinical relevance (Genomics England PanelApp)

Diagnostic Grade (Green)

  • Adult onset dystonia, chorea or related movement disorder

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Adult onset hereditary spastic paraplegia

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Adult onset neurodegenerative disorder

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Childhood onset dystonia, chorea or related movement disorder

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Childhood onset hereditary spastic paraplegia

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • DDG2P

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Early onset dystonia

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Intellectual disability

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal

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Disease associations (Open Targets)

  • dystonia 5

    0.84
  • GTP cyclohydrolase I deficiency with hyperphenylalaninemia

    0.81
  • Hyperphenylalaninemia

    0.78
  • GTP cyclohydrolase I deficiency

    0.75
  • Dystonia

    0.64
  • Spastic paraplegia

    0.52
  • Autosomal recessive dopa-responsive dystonia

    0.50
  • dystonic disorder

    0.46
  • hereditary disease

    0.45
  • dopa-responsive dystonia

    0.45

Score is the Open Targets composite evidence score (0-1). Higher = stronger gene-disease association.

Protein function (UniProt)

GTP cyclohydrolase 1

Positively regulates nitric oxide synthesis in umbilical vein endothelial cells (HUVECs). May be involved in dopamine synthesis. May modify pain sensitivity and persistence. Isoform GCH-1 is the functional enzyme, the potential function of the enzymatically inactive isoforms remains unknown

Data sources: HGNC (CC BY 4.0), AlphaFold (CC BY 4.0, Jumper et al. Nature 2021), Genomics England PanelApp (CC BY 4.0), ClinGen, Open Targets (CC0), UniProt.

Not for sole clinical decision-making. Always verify against primary sources.