Gene Information
Gene Symbol
CLAPO, CLOVE, CWS5, MCAP, MCM, MCMTC, PI3K, PI3K-alpha, p110-alpha
Entrez Gene ID
Gene Name
Phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit alpha
Chromosomal Location
Phosphatidylinositol 3-kinase is composed of an 85 kDa regulatory subunit and a 110 kDa catalytic subunit. The protein encoded by this gene represents the catalytic subunit, which uses ATP to phosphorylate PtdIns, PtdIns4P and PtdIns(4,5)P2. This gene has been found to be oncogenic and has been implicated in cervical cancers. A pseudogene of this gene has been defined on chromosome 22. [provided by RefSeq, Apr 2016]
RefSeq DNA
RefSeq mRNA

Gene Ontology (GO)

GO ID Ontology Function Evidence Reference
GO:0001944 Biological process Vasculature development TAS 19200708
GO:0014065 Biological process Phosphatidylinositol 3-kinase signaling IBA 21873635
GO:0016242 Biological process Negative regulation of macroautophagy NAS 23778976
GO:0016310 Biological process Phosphorylation IDA 25327288
GO:0016477 Biological process Cell migration IBA 21873635
Protein Information
Protein Name
Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform, PI3-kinase p110 subunit alpha, phosphatidylinositol 3-kinase, catalytic, 110-KD, alpha, phosphatidylinositol 3-kinase, catalytic, alpha polypeptide, phosphatidylinositol-4,5-bisphosphate 3-kinase 110 kDa catalytic subunit alpha, phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit, alpha isoform, phosphoinositide-3-kinase, catalytic, alpha polypeptide, ptdIns-3-kinase subunit p110-alpha, serine/threonine protein kinase PIK3CA
Phosphoinositide-3-kinase (PI3K) that phosphorylates PtdIns (Phosphatidylinositol), PtdIns4P (Phosphatidylinositol 4-phosphate) and PtdIns(4,5)P2 (Phosphatidylinositol 4,5-bisphosphate) to generate phosphatidylinositol 3,4,5-trisphosphate (PIP3). PIP3 plays a key role by recruiting PH domain-containing proteins to the membrane, including AKT1 and PDPK1, activating signaling cascades involved in cell growth, survival, proliferation, motility and morphology. Participates in cellular signaling in response to various growth factors. Involved in the activation of AKT1 upon stimulation by receptor tyrosine kinases ligands such as EGF, insulin, IGF1, VEGFA and PDGF. Involved in signaling via insulin-receptor substrate (IRS) proteins. Essential in endothelial cell migration during vascular development through VEGFA signaling, possibly by regulating RhoA activity. Required for lymphatic vasculature development, possibly by binding to RAS and by activation by EGF and FGF2, but not by PDGF. Regulates invadopodia formation through the PDPK1-AKT1 pathway. Participates in cardiomyogenesis in embryonic stem cells through a AKT1 pathway. Participates in vasculogenesis in embryonic stem cells through PDK1 and protein kinase C pathway. Also has serine-protein kinase activity: phosphorylates PIK3R1 (p85alpha regulatory subunit), EIF4EBP1 and HRAS. Plays a role in the positive regulation of phagocytosis and pinocytosis (By similarity).
Refseq Proteins
Pfam Accession Pfam ID
PF00454 PI3_PI4_kinase
PF00792 PI3K_C2
PF02192 PI3K_p85B
PF00794 PI3K_rbd
PF00613 PI3Ka

Inositol phosphate metabolism
Metabolic pathways
EGFR tyrosine kinase inhibitor resistance
Endocrine resistance
Platinum drug resistance
ErbB signaling pathway
Ras signaling pathway
Rap1 signaling pathway
cAMP signaling pathway
Chemokine signaling pathway
HIF-1 signaling pathway
FoxO signaling pathway
Phosphatidylinositol signaling system
Sphingolipid signaling pathway
Phospholipase D signaling pathway
Autophagy - animal
mTOR signaling pathway
PI3K-Akt signaling pathway
AMPK signaling pathway
Longevity regulating pathway
Longevity regulating pathway - multiple species
Cellular senescence
Axon guidance
VEGF signaling pathway
Osteoclast differentiation
Focal adhesion
Signaling pathways regulating pluripotency of stem cells
Platelet activation
Toll-like receptor signaling pathway
C-type lectin receptor signaling pathway
JAK-STAT signaling pathway
Natural killer cell mediated cytotoxicity
T cell receptor signaling pathway
B cell receptor signaling pathway
Fc epsilon RI signaling pathway
Fc gamma R-mediated phagocytosis
TNF signaling pathway
Leukocyte transendothelial migration
Neurotrophin signaling pathway
Cholinergic synapse
Inflammatory mediator regulation of TRP channels
Regulation of actin cytoskeleton
Insulin signaling pathway
Progesterone-mediated oocyte maturation
Estrogen signaling pathway
Prolactin signaling pathway
Thyroid hormone signaling pathway
Regulation of lipolysis in adipocytes
Relaxin signaling pathway
Type II diabetes mellitus
Insulin resistance
Non-alcoholic fatty liver disease (NAFLD)
AGE-RAGE signaling pathway in diabetic complications
Aldosterone-regulated sodium reabsorption
Carbohydrate digestion and absorption
Bacterial invasion of epithelial cells
Yersinia infection
Chagas disease (American trypanosomiasis)
Hepatitis C
Hepatitis B
Human cytomegalovirus infection
Influenza A
Human papillomavirus infection
Human T-cell leukemia virus 1 infection
Kaposi sarcoma-associated herpesvirus infection
Herpes simplex virus 1 infection
Epstein-Barr virus infection
Human immunodeficiency virus 1 infection
Pathways in cancer
Viral carcinogenesis
Proteoglycans in cancer
MicroRNAs in cancer
Colorectal cancer
Renal cell carcinoma
Pancreatic cancer
Endometrial cancer
Prostate cancer
Chronic myeloid leukemia
Acute myeloid leukemia
Small cell lung cancer
Non-small cell lung cancer
Breast cancer
Hepatocellular carcinoma
Gastric cancer
Central carbon metabolism in cancer
Choline metabolism in cancer
PD-L1 expression and PD-1 checkpoint pathway in cancer
Fluid shear stress and atherosclerosis


PI3K Cascade
IRS-mediated signalling
GPVI-mediated activation cascade
Constitutive Signaling by Ligand-Responsive EGFR Cancer Variants
PI3K events in ERBB4 signaling
PIP3 activates AKT signaling
Signaling by SCF-KIT
Synthesis of PIPs at the plasma membrane
GAB1 signalosome
Signaling by cytosolic FGFR1 fusion mutants
Downstream signal transduction
PI3K events in ERBB2 signaling
PI3K/AKT activation
Downstream TCR signaling
Role of phospholipids in phagocytosis
Tie2 Signaling
Constitutive Signaling by Aberrant PI3K in Cancer
DAP12 signaling
Role of LAT2/NTAL/LAB on calcium mobilization
Costimulation by the CD28 family
CD28 dependent PI3K/Akt signaling
G alpha (q) signalling events
Interleukin-3, Interleukin-5 and GM-CSF signaling
Constitutive Signaling by EGFRvIII
PI-3K cascade:FGFR1
PI-3K cascade:FGFR2
PI-3K cascade:FGFR3
PI-3K cascade:FGFR4
Signaling by FGFR2 in disease
Signaling by FGFR4 in disease
Signaling by FGFR1 in disease
PI5P, PP2A and IER3 Regulate PI3K/AKT Signaling
MET activates PI3K/AKT signaling
Signaling by FGFR3 fusions in cancer
Signaling by FGFR3 point mutants in cancer
RET signaling
Extra-nuclear estrogen signaling
Erythropoietin activates Phosphoinositide-3-kinase (PI3K)
Interleukin receptor SHC signaling
Regulation of signaling by CBL
Signaling by ERBB2 KD Mutants
Signaling by ERBB2 ECD mutants
Signaling by PDGFRA transmembrane, juxtamembrane and kinase domain mutants
Signaling by PDGFRA extracellular domain mutants

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Associated Diseases

Disease groupDisease NameReferences
Congenital, Hereditary, and Neonatal Diseases and Abnormalities
Hereditary hemorrhagic telangiectasia
Genetic Diseases
Megalencephaly-Capillary Malformation (MCAP) Syndrome
Cortical Dysplasia
Macrodactyly of the foot

Conserved insulin signaling in the regulation of oocyte growth, development, and maturation.

Das Debabrata, Arur Swathi
Department of Genetics, The University of Texas MD Anderson Cancer Center, Houston, Texas.| Department of Genetics, The University of Texas MD Anderson Cancer Center, Houston, Texas.
Mol Reprod Dev. 2017 Jun;84(6):444-459. doi: 10.1002/mrd.22806. Epub 2017 Apr 24.

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