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PIK3R1

Chr 5q13.1

phosphoinositide-3-kinase regulatory subunit 1

Aliases:
GRB1, p85-ALPHA, p85, p85alpha
MANE:
ENST00000521381.6

Annotations refreshed 1 month ago.

Predicted protein structure

Clinical relevance (Genomics England PanelApp)

Diagnostic Grade (Green)

  • Corneal abnormalities

    MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
  • COVID-19 research

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

    MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
  • Diabetes with additional phenotypes suggestive of a monogenic aetiology

    MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
  • Familial diabetes

    MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
  • Fetal anomalies

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Insulin resistance (including lipodystrophy)

    MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
  • IUGR and IGF abnormalities

    MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted

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Disease associations (Open Targets)

  • SHORT syndrome

    0.82
  • immunodeficiency 36 with lymphoproliferation

    0.76
  • agammaglobulinemia 7, autosomal recessive

    0.74
  • cancer

    0.63
  • autosomal agammaglobulinemia

    0.63
  • activated PI3K-delta syndrome

    0.59
  • bone development disease

    0.56
  • endometrial cancer

    0.56
  • isolated agammaglobulinemia

    0.55
  • neurodegenerative disease

    0.53

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

Protein function (UniProt)

Phosphatidylinositol 3-kinase regulatory subunit alpha

Binds to activated (phosphorylated) protein-Tyr kinases, through its SH2 domain, and acts as an adapter, mediating the association of the p110 catalytic unit to the plasma membrane. Necessary for the insulin-stimulated increase in glucose uptake and glycogen synthesis in insulin-sensitive tissues. Plays an important role in signaling in response to FGFR1, FGFR2, FGFR3, FGFR4, KITLG/SCF, KIT, PDGFRA and PDGFRB. Likewise, plays a role in ITGB2 signaling (PubMed:17626883, PubMed:19805105, PubMed:7518429). Modulates the cellular response to ER stress by promoting nuclear translocation of XBP1 isoform 2 in a ER stress- and/or insulin-dependent manner during metabolic overloading in the liver and hence plays a role in glucose tolerance improvement (PubMed:20348923)

Curated MONDO disease pages that list PIK3R1 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.