PIK3R6

gene
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Also known as FLJ34500HsT41028p87PIKAP

Summary

PIK3R6 (phosphoinositide-3-kinase regulatory subunit 6, HGNC:27101) is a protein-coding gene on chromosome 17p13.1, encoding Phosphoinositide 3-kinase regulatory subunit 6 (Q5UE93). Regulatory subunit of the PI3K gamma complex.

Phosphoinositide 3-kinase gamma is a lipid kinase that produces the lipid second messenger phosphatidylinositol 3,4,5-trisphosphate. The kinase is composed of a catalytic subunit and one of several regulatory subunits, and is chiefly activated by G protein-coupled receptors. This gene encodes a regulatory subunit, and is distantly related to the phosphoinositide-3-kinase, regulatory subunit 5 gene which is located adjacent to this gene on chromosome 7. The orthologous protein in the mouse binds to both the catalytic subunit and to G(beta/gamma), and mediates activation of the kinase subunit downstream of G protein-coupled receptors. Alternative splicing results in multiple transcript variants.

Source: NCBI Gene 146850 — RefSeq curated summary.

At a glance

  • GWAS associations: 1
  • Clinical variants (ClinVar): 130 total
  • MANE Select transcript: NM_001010855

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:27101
Approved symbolPIK3R6
Namephosphoinositide-3-kinase regulatory subunit 6
Location17p13.1
Locus typegene with protein product
StatusApproved
AliasesFLJ34500, HsT41028, p87PIKAP
Ensembl geneENSG00000276231
Ensembl biotypeprotein_coding
OMIM611462
Entrez146850

Gene structure

Transcript identifiers

Ensembl transcripts: 6 — 4 protein_coding, 2 nonsense_mediated_decay

ENST00000611951, ENST00000613555, ENST00000619866, ENST00000907451, ENST00000907452, ENST00000907453

RefSeq mRNA: 2 — MANE Select: NM_001010855 NM_001010855, NM_001290211

CCDS: CCDS73985

Canonical transcript exons

ENST00000619866 — 20 exons

ExonStartEnd
ENSE0000371194588297068829792
ENSE0000371201388218468821936
ENSE0000371235388352738835456
ENSE0000371890188271728827294
ENSE0000372209188285678828990
ENSE0000372269688328898833045
ENSE0000372456988365478836616
ENSE0000372517988378038837871
ENSE0000372874188497828849885
ENSE0000373125288233878823497
ENSE0000373410388040418804153
ENSE0000373743888190838819198
ENSE0000374309888027228803429
ENSE0000374381288225878822657
ENSE0000374573588281128828190
ENSE0000374640288229968823086
ENSE0000375246988367918836923
ENSE0000375266288385648838655
ENSE0000375485688396148839697
ENSE0000389745788675298867674

Expression profiles

Bgee: expression breadth ubiquitous, 156 present calls, max score 79.83.

FANTOM5 (CAGE): breadth broad, TPM avg 6.0397 / max 435.9539, expressed in 479 samples.

FANTOM5 promoters (1 alternative TSS)

Promoter IDTPM avgSamples expressed
1644556.0397479

Top tissues by expression

241 total, by Bgee expression score (0-100, higher = more expressed):

TissueAnatomy IDExpression scoreQuality
granulocyteCL:000009479.83gold quality
monocyteCL:000057679.72gold quality
leukocyteCL:000073879.43gold quality
male germ line stem cell (sensu Vertebrata) in testisCL:0000089 ∩ UBERON:000047375.70gold quality
spleenUBERON:000210673.15gold quality
vermiform appendixUBERON:000115472.24gold quality
apex of heartUBERON:000209872.16gold quality
bloodUBERON:000017871.71gold quality
primordial germ cell in gonadCL:0000670 ∩ UBERON:000099169.66gold quality
gall bladderUBERON:000211068.50gold quality
small intestine Peyer’s patchUBERON:000345466.83gold quality
lymph nodeUBERON:000002966.67gold quality
bone marrow cellCL:000209266.39silver quality
mucosa of transverse colonUBERON:000499165.68gold quality
caecumUBERON:000115365.35gold quality
small intestineUBERON:000210865.33gold quality
upper lobe of left lungUBERON:000895265.10gold quality
lower esophagus muscularis layerUBERON:003583364.54gold quality
lower esophagusUBERON:001347364.53gold quality
smooth muscle tissueUBERON:000113564.47gold quality
esophagogastric junction muscularis propriaUBERON:003584164.27gold quality
ganglionic eminenceUBERON:000402364.00gold quality
heart left ventricleUBERON:000208463.96gold quality
right coronary arteryUBERON:000162563.50gold quality
upper lobe of lungUBERON:000894863.37gold quality
cardiac ventricleUBERON:000208263.16gold quality
putamenUBERON:000187462.92gold quality
lower esophagus mucosaUBERON:003583462.82gold quality
rectumUBERON:000105262.68gold quality
esophagusUBERON:000104362.07gold quality

Single-cell (SCXA)

Detected in 4 experiment(s), a significant marker in 4.

ExperimentMarker?Max mean expression
E-MTAB-6678yes23.57
E-MTAB-9067yes15.35
E-ANND-3yes6.86
E-MTAB-9801yes6.35

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

66 targeting PIK3R6, top 30 by miRDB confidence (max_score; target_count = how many genes the miRNA targets in total — lower means more specific):

miRNAMax scoreAvg scoremiRNA target_count
HSA-MIR-4481100.0066.421669
HSA-MIR-6833-3P100.0070.633197
HSA-MIR-4768-5P100.0069.492861
HSA-MIR-3646100.0073.565283
HSA-MIR-4747-5P100.0067.902681
HSA-MIR-5196-5P100.0067.982761
HSA-MIR-4745-5P99.9865.951028
HSA-MIR-493-5P99.9672.472382
HSA-MIR-449299.8768.253611
HSA-MIR-4728-5P99.8569.394718
HSA-MIR-6756-5P99.8267.972466
HSA-MIR-6785-5P99.8268.684428
HSA-MIR-92A-2-5P99.7567.012164
HSA-MIR-7856-5P99.7569.992901
HSA-MIR-149-3P99.7268.223963
HSA-MIR-365999.7067.97694
HSA-MIR-6883-5P99.6968.053785
HSA-MIR-472999.6972.184233
HSA-MIR-6766-5P99.6867.702325
HSA-MIR-64699.6867.841645
HSA-MIR-3177-5P99.6570.381174
HSA-MIR-613499.6365.681537
HSA-MIR-142-3P99.6271.30974
HSA-MIR-76299.5866.611994
HSA-MIR-427699.5667.662514
HSA-MIR-4687-3P99.4866.41968
HSA-MIR-449899.4767.422360
HSA-MIR-190B-3P99.3368.291382
HSA-MIR-6719-3P99.2967.781387
HSA-MIR-6731-5P99.2867.422375

Literature-anchored findings (GeneRIF, showing 10)

  • p87PIKAP is a novel regulatory subunit of phosphoinositide 3-kinase gamma that is highly expressed in heart and interacts with PDE3B [p87PIKAP] (PMID:16476736)
  • ablation of PI3Kgamma reduced SDF1alpha-induced integrin activation in human EPCs and in murine Lin(-) BM-derived progenitor cells (PMID:18323525)
  • RACK1 regulates directional cell migration by acting on G betagamma at the interface with its effectors PLC beta and PI3K gamma (PMID:18596232)
  • knockdown of p84 in MDA-MB-231 cells enhanced Akt phosphorylation and lung colonization (PMID:21996737)
  • GPCR activation of Ras and PI3Kc in neutrophils depends on PLCb2/b3 and the RasGEF RasGRP4. (PMID:22728827)
  • expression and activities of PI3Kgamma are modified differently by p87 and p101 in vitro and in living cells, arguing for specific regulatory roles of the non-catalytic subunits in the differentiation of PI3Kgamma signaling pathways. (PMID:24014027)
  • Our findings suggest that p84 binding to p110gamma may represent a novel negative feedback signal that terminates PI3Kgamma activity. (PMID:25753393)
  • RBBP6 aggravates the progression of ovarian cancer by targeting PIK3R6. (PMID:33155192)
  • PIK3R6 Promotes Angiogenesis in Hepatocellular carcinoma by Activating STAT3 Signaling Pathway. (PMID:37708538)
  • Knockdown of PIK3R6 impedes the onset and advancement of clear cell renal cell carcinoma. (PMID:38831518)

Cross-species orthologs

3 orthologs

OrganismSymbolGene ID
danio_reriopik3r6bENSDARG00000091140
mus_musculusPik3r6ENSMUSG00000046207
rattus_norvegicusPik3r6ENSRNOG00000003992

Paralogs (1): PIK3R5 (ENSG00000141506)

Protein

Protein identifiers

Phosphoinositide 3-kinase regulatory subunit 6Q5UE93 (reviewed: Q5UE93)

Alternative names: Phosphoinositide 3-kinase gamma adapter protein of 87 kDa, p84 PI3K adapter protein, p87 PI3K adapter protein

All UniProt accessions (2): Q5UE93, A0A087X1F3

UniProt curated annotations — full annotation on UniProt →

Function. Regulatory subunit of the PI3K gamma complex. Acts as an adapter to drive activation of PIK3CG by beta-gamma G protein dimers. The PIK3CG:PIK3R6 heterodimer is much less sensitive to beta-gamma G protein dimers than PIK3CG:PIK3R5 and its membrane recruitment and beta-gamma G protein dimer-dependent activation requires HRAS bound to PIK3CG. Recruits of the PI3K gamma complex to a PDE3B:RAPGEF3 signaling complex involved in angiogenesis; signaling seems to involve RRAS.

Subunit / interactions. Heterodimer of a catalytic subunit (PIK3CG) and a regulatory (PIK3R6) subunit. The binding of PIK3R6 to PIK3CG may exclude the binding of PIK3R5 to PIK3CG. Interacts with beta-gamma G protein dimers. Interacts with PDE3B and RAPGEF3; form a signaling complex that regulates phosphatidylinositol 3-kinase gamma in angiogenesis.

Subcellular location. Cytoplasm. Cell membrane.

RefSeq proteins (2): NP_001010855, NP_001277140 (=MANE)

Domains & families (InterPro)

IDNameType
IPR019522PIK3R5/6Family

Pfam: PF10486

UniProt features (2 total): chain 1, region of interest 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q5UE93-F175.190.38

Function

Pathways and Gene Ontology

Reactome pathways

8 pathways

IDPathway
R-HSA-114604GPVI-mediated activation cascade
R-HSA-1257604PIP3 activates AKT signaling
R-HSA-1660499Synthesis of PIPs at the plasma membrane
R-HSA-2219530Constitutive Signaling by Aberrant PI3K in Cancer
R-HSA-389357CD28 dependent PI3K/Akt signaling
R-HSA-392451G beta:gamma signalling through PI3Kgamma
R-HSA-6811558PI5P, PP2A and IER3 Regulate PI3K/AKT Signaling
R-HSA-9927354Co-stimulation by ICOS

MSigDB gene sets: 205 (showing top): GOBP_REGULATION_OF_CELL_ACTIVATION, GOBP_POSITIVE_REGULATION_OF_HEMOPOIESIS, GOBP_REGULATION_OF_PHOSPHORYLATION, REACTOME_ADAPTIVE_IMMUNE_SYSTEM, REACTOME_PLATELET_ACTIVATION_SIGNALING_AND_AGGREGATION, GOBP_POSITIVE_REGULATION_OF_VASCULATURE_DEVELOPMENT, GOBP_POSITIVE_REGULATION_OF_MAPK_CASCADE, GOBP_LEUKOCYTE_MEDIATED_CYTOTOXICITY, GOBP_REGULATION_OF_TRANSFERASE_ACTIVITY, GOBP_LEUKOCYTE_MEDIATED_IMMUNITY, REACTOME_CO_STIMULATION_BY_CD28, GOBP_POSITIVE_REGULATION_OF_CELL_ADHESION, GOBP_CELL_CELL_ADHESION, GOBP_REGULATION_OF_LEUKOCYTE_DIFFERENTIATION, GOBP_POSITIVE_REGULATION_OF_CATALYTIC_ACTIVITY

GO Biological Process (7): angiogenesis (GO:0001525), immune response (GO:0006955), G protein-coupled receptor signaling pathway (GO:0007186), regulation of natural killer cell mediated cytotoxicity (GO:0042269), positive regulation of MAP kinase activity (GO:0043406), positive regulation of T cell differentiation (GO:0045582), positive regulation of angiogenesis (GO:0045766)

GO Molecular Function (3): 1-phosphatidylinositol-4,5-bisphosphate 3-kinase activity (GO:0046934), 1-phosphatidylinositol-3-kinase regulator activity (GO:0046935), protein binding (GO:0005515)

GO Cellular Component (7): cytosol (GO:0005829), plasma membrane (GO:0005886), phosphatidylinositol 3-kinase complex (GO:0005942), phosphatidylinositol 3-kinase complex, class IA (GO:0005943), phosphatidylinositol 3-kinase complex, class IB (GO:0005944), membrane (GO:0016020), cytoplasm (GO:0005737)

Reactome top-level categories

Rollup of top-8 pathways:

CategoryPathways
Platelet activation, signaling and aggregation1
Intracellular signaling by second messengers1
PI Metabolism1
PI3K/AKT Signaling in Cancer1
Co-stimulation by CD281
G-protein beta:gamma signalling1
Negative regulation of the PI3K/AKT network1
Regulation of T cell activation by CD28 family1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
cellular anatomical structure3
phosphatidylinositol 3-kinase complex, class I2
blood vessel morphogenesis1
anatomical structure formation involved in morphogenesis1
immune system process1
response to stimulus1
G protein-coupled receptor activity1
signal transduction1
regulation of leukocyte mediated cytotoxicity1
regulation of natural killer cell mediated immunity1
natural killer cell mediated cytotoxicity1
MAP kinase activity1
regulation of MAP kinase activity1
positive regulation of MAPK cascade1
positive regulation of protein serine/threonine kinase activity1
T cell differentiation1
regulation of T cell differentiation1
positive regulation of lymphocyte differentiation1
positive regulation of T cell activation1
angiogenesis1
regulation of angiogenesis1
positive regulation of vasculature development1
phosphatidylinositol kinase activity1
1-phosphatidylinositol-3-kinase activity1
kinase regulator activity1
binding1
cytoplasm1
membrane1
cell periphery1
extrinsic component of membrane1
transferase complex, transferring phosphorus-containing groups1
membrane protein complex1
intracellular anatomical structure1

Protein interactions and networks

STRING

682 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
PIK3R6PIK3CGP48736988
PIK3R6PDE3BQ13370695
PIK3R6PIK3R3Q92569693
PIK3R6GNG2P59768661
PIK3R6GNB1P04697581
PIK3R6SUCLG2Q96I99558
PIK3R6PIK3R2O00459482
PIK3R6PIK3C2BO00750471
PIK3R6PIK3CBP42338448
PIK3R6PIK3CDO00329447
PIK3R6TLR9Q9NR96429
PIK3R6PIK3C2GO75747419
PIK3R6PIK3R1P27986405
PIK3R6PIK3R5Q8WYR1390
PIK3R6IMMTQ16891380

IntAct

13 interactions, top by confidence:

ABTypeScore
PDE3BRAPGEF3psi-mi:“MI:0914”(association)0.640
PDE3BPIK3R6psi-mi:“MI:0915”(physical association)0.590
PIK3R6PDE3Bpsi-mi:“MI:0407”(direct interaction)0.590
PIK3R6S100A10psi-mi:“MI:0915”(physical association)0.400
PIK3R6STX3psi-mi:“MI:0915”(physical association)0.400
PIK3R6TCP1psi-mi:“MI:0915”(physical association)0.400
PIK3R6RPL10Apsi-mi:“MI:0915”(physical association)0.400
PIK3R6DHX9psi-mi:“MI:0915”(physical association)0.400
PIK3R6H1-1psi-mi:“MI:0915”(physical association)0.400
PIK3R6RFC5psi-mi:“MI:0915”(physical association)0.400
RAPGEF3PIK3R6psi-mi:“MI:0915”(physical association)0.400
PIK3R6HSPA8psi-mi:“MI:0914”(association)0.350

BioGRID (18): PIK3R6 (Affinity Capture-Western), PIK3R6 (FRET), PIK3R6 (Proximity Label-MS), PIK3R6 (Proximity Label-MS), PIK3R6 (Proximity Label-MS), PIK3R6 (Proximity Label-MS), PIK3R6 (Proximity Label-MS), PIK3R6 (Proximity Label-MS), PIK3R6 (Proximity Label-MS), PIK3R6 (Affinity Capture-MS), ASRGL1 (Affinity Capture-MS), HSPA8 (Affinity Capture-MS), STUB1 (Affinity Capture-MS), PIK3R6 (Cross-Linking-MS (XL-MS)), PIK3R6 (Cross-Linking-MS (XL-MS))

ESM2 similar proteins: A1A4J7, A2A9C3, A2BID5, B1WC10, E7FAW3, E7FCN8, O02696, O15360, O75153, O75800, O95248, Q08D69, Q1JPG0, Q3U6Q4, Q499Q5, Q5BLE2, Q5SW28, Q5SW45, Q5T011, Q5U1Z0, Q5U249, Q5UE93, Q5ZIB8, Q6AXZ5, Q6GLY5, Q6GR21, Q6PGF3, Q6ZNJ1, Q6ZQA0, Q7L4E1, Q8BK03, Q8BM55, Q8BMG7, Q8C3S2, Q8CJF7, Q8ND04, Q8QZV7, Q8TC57, Q8VDR9, Q8VE18

Diamond homologs: Q3U6Q4, Q5UE93

SIGNOR signaling

3 interactions.

AEffectBMechanism
AKT1“up-regulates activity”PIK3R6phosphorylation
AKT“up-regulates activity”PIK3R6phosphorylation
PIK3R6“down-regulates activity”PI3Kbinding

Disease & clinical

Clinical variants and AI predictions

ClinVar

130 variants total. Per-class counts are floors (≥ shown; pagination cap):

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance106
Likely benign2
Benign0

Top pathogenic / likely-pathogenic (0)

SpliceAI

3051 predictions. Top by Δscore:

VariantEffectΔscore
17:8804051:C:Adonor_gain1.0000
17:8804150:CTGT:Cacceptor_gain1.0000
17:8822991:CTTA:Cdonor_loss1.0000
17:8822995:C:CAdonor_loss1.0000
17:8823085:AT:Aacceptor_gain1.0000
17:8823382:CTTA:Cdonor_loss1.0000
17:8823383:TTAC:Tdonor_loss1.0000
17:8823384:TA:Tdonor_loss1.0000
17:8823385:A:ATdonor_loss1.0000
17:8823498:C:CCacceptor_gain1.0000
17:8827171:CCAT:Cdonor_gain1.0000
17:8829673:CCA:Cdonor_gain1.0000
17:8829705:CAGAG:Cdonor_gain1.0000
17:8832883:GCTT:Gdonor_loss1.0000
17:8832884:CTTAC:Cdonor_loss1.0000
17:8832885:TTACC:Tdonor_loss1.0000
17:8832886:TACCA:Tdonor_loss1.0000
17:8832888:C:CAdonor_loss1.0000
17:8832888:CCA:Cdonor_gain1.0000
17:8833044:GCCT:Gacceptor_loss1.0000
17:8833045:CCTG:Cacceptor_loss1.0000
17:8833047:T:Cacceptor_loss1.0000
17:8835272:CCTG:Cdonor_gain1.0000
17:8835281:T:TAdonor_gain1.0000
17:8835452:ACACT:Aacceptor_gain1.0000
17:8835453:CACT:Cacceptor_gain1.0000
17:8835453:CACTC:Cacceptor_gain1.0000
17:8835455:CT:Cacceptor_gain1.0000
17:8835456:TC:Tacceptor_loss1.0000
17:8835456:TCTG:Tacceptor_gain1.0000

AlphaMissense

4879 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
17:8838644:A:GW37R0.995
17:8838644:A:TW37R0.995
17:8828633:G:TA416D0.988
17:8838642:C:AW37C0.988
17:8838642:C:GW37C0.988
17:8823031:A:GL561P0.983
17:8803291:G:CF749L0.982
17:8803291:G:TF749L0.982
17:8803293:A:GF749L0.982
17:8829727:A:GW290R0.981
17:8829727:A:TW290R0.981
17:8823430:C:GR528P0.980
17:8827225:A:CY488D0.980
17:8835340:A:TV193D0.980
17:8838571:A:GL61P0.979
17:8827228:A:GW487R0.977
17:8827228:A:TW487R0.977
17:8838637:A:GL39P0.976
17:8823042:G:CF557L0.972
17:8823042:G:TF557L0.972
17:8823044:A:GF557L0.972
17:8828615:C:TG422E0.972
17:8828860:G:CS340R0.969
17:8828860:G:TS340R0.969
17:8828862:T:GS340R0.969
17:8823425:C:GG530R0.968
17:8828616:C:GG422R0.968
17:8828616:C:TG422R0.968
17:8838643:C:GW37S0.967
17:8835445:A:GF158S0.966

dbSNP variants (sampled 300 via entrez): RS1000026905 (17:8846256 A>C,G), RS1000040677 (17:8815283 G>A), RS1000105792 (17:8853121 T>C), RS1000243982 (17:8818024 A>G), RS1000292210 (17:8830049 A>T), RS1000293988 (17:8855878 A>G), RS1000355612 (17:8861930 T>G), RS1000396534 (17:8861688 A>G,T), RS1000468862 (17:8823575 C>G,T), RS1000498092 (17:8838808 T>G), RS1000571256 (17:8841637 T>A), RS1000609364 (17:8806290 T>C), RS1000613610 (17:8844025 G>A,T), RS1000661926 (17:8806109 A>G), RS1000763818 (17:8812514 T>A)

Disease associations

OMIM: gene MIM:611462 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

0 total (0 of 0 shown, HPO-id order):

GWAS associations

1 associations (top):

StudyTraitp-value
GCST009391_1759Metabolite levels3.000000e-06

EFO canonical traits (1, from GWAS)

EFO IDTrait name
EFO:0010370lysophosphatidylethanolamine 20:4 measurement

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

PharmGKB: 1 entry (VIP=true, CPIC=false)

GtoPdb / IUPHAR curated pharmacology

(IUPHAR/BPS Guide to Pharmacology — expert-curated)

Target class: enzyme — Phosphatidylinositol kinases

CTD chemical–gene interactions

13 total (human), top 13 by PubMed support.

ChemicalActions (top 5)PubMed papers
Benzo(a)pyreneincreases methylation, affects methylation, decreases expression3
Formaldehydeincreases expression2
Aflatoxin B1affects expression, decreases methylation2
GSK-J4increases expression1
triphenyl phosphateaffects expression1
bisphenol Adecreases methylation1
aflatoxin B2increases methylation1
Air Pollutantsincreases abundance, increases expression1
Allergensincreases expression1
Oxygenincreases expression1
Phthalic Acidsincreases methylation1
Cyclosporinedecreases expression1
Particulate Matterincreases expression, increases abundance1

Cellosaurus cell lines

2 cell lines: 2 cancer cell line

First 10 cell lines (id-ordered, not curated):

CellosaurusNameCategorySex
CVCL_TD72HAP1 PIK3R6 (-) 1Cancer cell lineMale
CVCL_TD73HAP1 PIK3R6 (-) 2Cancer cell lineMale

Clinical trials (associated diseases)

0 trials via MONDO — disease-level, not drug-specific.

No linked Atlas pages yet — the cross-entity mesh grows as the corpus expands.