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ITPR1

Chr 3p26.1

inositol 1,4,5-trisphosphate receptor type 1

Aliases:
Insp3r1, IP3R1, ACV, PPP1R94
MANE:
ENST00000649015.2

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Predicted protein structure

Clinical relevance (Genomics England PanelApp)

Diagnostic Grade (Green)

  • Ataxia and cerebellar anomalies - narrow panel

    BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal
  • Cerebellar hypoplasia

    BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal
  • DDG2P

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Hereditary ataxia

    MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
  • Hereditary ataxia with onset in adulthood

    MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
  • Intellectual disability

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Sporadic aniridia

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

    MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown

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Disease associations (Open Targets)

  • Aniridia - cerebellar ataxia - intellectual disability

    0.81
  • spinocerebellar ataxia type 29

    0.81
  • aniridia-cerebellar ataxia-intellectual disability syndrome

    0.80
  • spinocerebellar ataxia type 15/16

    0.76
  • hereditary disease

    0.53
  • neurodevelopmental disorder

    0.43
  • alcohol drinking

    0.43
  • uterine corpus leiomyoma

    0.41
  • breast carcinoma

    0.40
  • cervical carcinoma

    0.34

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

Protein function (UniProt)

Inositol 1,4,5-trisphosphate-gated calcium channel ITPR1

Inositol 1,4,5-trisphosphate-gated calcium channel that, upon inositol 1,4,5-trisphosphate binding, mediates calcium release from the endoplasmic reticulum (ER) (PubMed:10620513, PubMed:27108797). Undergoes conformational changes upon ligand binding, suggesting structural flexibility that allows the channel to switch from a closed state, capable of interacting with its ligands such as 1,4,5-trisphosphate and calcium, to an open state, capable of transferring calcium ions across the ER membrane (By similarity). Cytoplasmic calcium released from the ER triggers apoptosis by the activation of CAMK2 complex (By similarity). Involved in the regulation of epithelial secretion of electrolytes and fluid through the interaction with AHCYL1 (By similarity). Part of a complex composed of HSPA9, ITPR1 and VDAC1 that regulates mitochondrial calcium-dependent apoptosis by facilitating calcium transport from the ER lumen to the mitochondria intermembrane space thus providing calcium for the downstream calcium channel MCU that directly releases it into mitochondria matrix (By similarity). Regulates fertilization and egg activation by tuning the frequency and amplitude of calcium oscillations (By similarity)

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.