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ITPA

Chr 20p13

inosine triphosphatase

Aliases:
HLC14-06-P, dJ794I6.3
MANE:
ENST00000380113.8

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Predicted protein structure

Clinical relevance (Genomics England PanelApp)

Diagnostic Grade (Green)

  • Early onset or syndromic epilepsy

    BIALLELIC, autosomal or pseudoautosomal
  • Intellectual disability

    BIALLELIC, autosomal or pseudoautosomal
  • Likely inborn error of metabolism

    BIALLELIC, autosomal or pseudoautosomal
  • Undiagnosed metabolic disorders

    BIALLELIC, autosomal or pseudoautosomal
  • Childhood onset dystonia, chorea or related movement disorder

  • Structural eye disease

    BIALLELIC, autosomal or pseudoautosomal

Disease associations (Open Targets)

  • developmental and epileptic encephalopathy, 35

    0.77
  • inosine triphosphatase deficiency

    0.74
  • genetic developmental and epileptic encephalopathy

    0.62
  • chronic hepatitis C virus infection

    0.44
  • infantile epileptic-dyskinetic encephalopathy

    0.44
  • anemia (phenotype)

    0.38
  • response to ribavirin

    0.36
  • Hypodontia

    0.34
  • hereditary disease

    0.34
  • neurodegenerative disease

    0.30

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

Protein function (UniProt)

Inosine triphosphate pyrophosphatase

Pyrophosphatase that hydrolyzes the non-canonical purine nucleotides inosine triphosphate (ITP), deoxyinosine triphosphate (dITP) as well as 2'-deoxy-N-6-hydroxylaminopurine triphosphate (dHAPTP) and xanthosine 5'-triphosphate (XTP) to their respective monophosphate derivatives. The enzyme does not distinguish between the deoxy- and ribose forms. Probably excludes non-canonical purines from RNA and DNA precursor pools, thus preventing their incorporation into RNA and DNA and avoiding chromosomal lesions

Curated MONDO disease pages that list ITPA among their top associated genes.

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.