GEM

gene
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Also known as KIR

Summary

GEM (GTP binding protein overexpressed in skeletal muscle, HGNC:4234) is a protein-coding gene on chromosome 8q22.1, encoding GTP-binding protein GEM (P55040). Could be a regulatory protein, possibly participating in receptor-mediated signal transduction at the plasma membrane.

The protein encoded by this gene belongs to the RAD/GEM family of GTP-binding proteins. It is associated with the inner face of the plasma membrane and could play a role as a regulatory protein in receptor-mediated signal transduction. Alternative splicing occurs at this locus and two transcript variants encoding the same protein have been identified.

Source: NCBI Gene 2669 — RefSeq curated summary.

At a glance

  • GWAS associations: 4
  • Clinical variants (ClinVar): 49 total
  • MANE Select transcript: NM_005261

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:4234
Approved symbolGEM
NameGTP binding protein overexpressed in skeletal muscle
Location8q22.1
Locus typegene with protein product
StatusApproved
AliasesKIR
Ensembl geneENSG00000164949
Ensembl biotypeprotein_coding
OMIM600164
Entrez2669

Gene structure

Transcript identifiers

Ensembl transcripts: 18 — 16 protein_coding, 2 retained_intron

ENST00000297596, ENST00000396194, ENST00000521817, ENST00000523433, ENST00000523660, ENST00000893822, ENST00000893823, ENST00000893824, ENST00000893825, ENST00000893826, ENST00000893827, ENST00000893828, ENST00000893829, ENST00000893830, ENST00000893831, ENST00000969492, ENST00000969493, ENST00000969494

RefSeq mRNA: 2 — MANE Select: NM_005261 NM_005261, NM_181702

CCDS: CCDS6261

Canonical transcript exons

ENST00000297596 — 5 exons

ExonStartEnd
ENSE000010889109425303694253112
ENSE000010889119426209094262319
ENSE000010889129426017394260512
ENSE000010889149425201994252223
ENSE000021142139424925394250587

Expression profiles

Bgee: expression breadth ubiquitous, 278 present calls, max score 99.38.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 12.9844 / max 919.3369, expressed in 1309 samples.

FANTOM5 promoters (2 alternative TSS)

Promoter IDTPM avgSamples expressed
9398312.55171307
939820.4326207

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
pigmented layer of retinaUBERON:000178299.38gold quality
retinaUBERON:000096699.35gold quality
blood vessel layerUBERON:000479799.27gold quality
gall bladderUBERON:000211099.23gold quality
cauda epididymisUBERON:000436098.76gold quality
vena cavaUBERON:000408798.45gold quality
mucosa of stomachUBERON:000119998.11gold quality
ascending aortaUBERON:000149698.09gold quality
right coronary arteryUBERON:000162598.09gold quality
thoracic aortaUBERON:000151598.03gold quality
cartilage tissueUBERON:000241897.71gold quality
descending thoracic aortaUBERON:000234597.30gold quality
mucosa of urinary bladderUBERON:000125997.02gold quality
secondary oocyteCL:000065596.85gold quality
choroid plexus epitheliumUBERON:000391196.82gold quality
muscle layer of sigmoid colonUBERON:003580596.82gold quality
aortaUBERON:000094796.81gold quality
saphenous veinUBERON:000731896.42gold quality
left uterine tubeUBERON:000130396.05gold quality
popliteal arteryUBERON:000225095.90gold quality
tibial arteryUBERON:000761095.89gold quality
arteryUBERON:000163795.85gold quality
left coronary arteryUBERON:000162695.84gold quality
urethraUBERON:000005795.73gold quality
mammary ductUBERON:000176595.53gold quality
coronary arteryUBERON:000162195.52gold quality
endocervixUBERON:000045895.51gold quality
epithelium of mammary glandUBERON:000324494.61gold quality
pericardiumUBERON:000240794.57gold quality
omental fat padUBERON:001041494.57gold quality

Single-cell (SCXA)

Detected in 10 experiment(s), a significant marker in 9.

ExperimentMarker?Max mean expression
E-GEOD-135922yes51.49
E-MTAB-6701yes44.75
E-MTAB-10287yes44.39
E-CURD-122yes12.33
E-MTAB-5061yes11.89
E-MTAB-6678yes10.90
E-GEOD-81547yes10.06
E-MTAB-10553yes7.29
E-MTAB-8060no53.27
E-ANND-3no0.00

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

76 targeting GEM, 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-5692A100.0074.406850
HSA-MIR-200B-3P100.0073.312693
HSA-MIR-200C-3P100.0073.352685
HSA-MIR-429100.0073.442698
HSA-MIR-4795-3P100.0074.624024
HSA-MIR-1277-5P100.0073.955056
HSA-MIR-548AW99.9972.573559
HSA-MIR-366299.9973.825684
HSA-MIR-453499.9966.581907
HSA-MIR-428299.9975.366408
HSA-MIR-27A-3P99.9872.132955
HSA-MIR-27B-3P99.9872.132955
HSA-MIR-998599.9872.112939
HSA-MIR-50799.9770.111915
HSA-MIR-60799.9773.625593
HSA-MIR-55799.9670.011640
HSA-MIR-1468-3P99.9672.743797
HSA-MIR-365899.9673.874379
HSA-MIR-548AJ-3P99.9673.385345
HSA-MIR-548X-3P99.9673.385345
HSA-MIR-808299.9567.271170
HSA-MIR-128-3P99.9571.172484
HSA-MIR-216A-3P99.9571.192505
HSA-MIR-548J-3P99.9472.614881
HSA-MIR-548AE-3P99.9372.664867
HSA-MIR-548AH-3P99.9372.544872
HSA-MIR-548AM-3P99.9372.544872
HSA-MIR-548AQ-3P99.9372.664867
HSA-MIR-450B-5P99.9271.483175
HSA-MIR-589-3P99.9169.622088

Literature-anchored findings (GeneRIF, showing 13)

  • We discuss the structural and functional properties of RGK proteins and highlight recent work addressing the mechanism of Gem regulation by calmodulin and 14-3-3. (PMID:16242932)
  • crystallographic structure and biochemical characterization indicate that Gem G-domain markedly prefers GDP over GTP (PMID:17052716)
  • Gem is a bona fide GTPase that exhibits striking structural and biochemical features that should impact its regulation and cellular activities (PMID:17107948)
  • GEM plays a key role during C. pneumoniae entry into human cells. (PMID:20233927)
  • Gem contains two candidate inhibitory sites, each capable of producing full inhibition of P/Q-type Ca(2+) channels. (PMID:22589533)
  • Data show a mechanism by which GTPase Gem contributes to the mitotic progression by maintaining correct spindle length through the kinesin Kif9. (PMID:22964304)
  • Gem is involved both in T-cell spontaneous cell migration as well as chemotaxis and plays an important role in cell-to-cell HTLV-1 viral transmission. (PMID:24586148)
  • Down regulation of Gem expression was involved in the pathogenesis of hepatocellular carcinoma (HCC), and it might be a favorable independent prognostic parameter for HCC. (PMID:25155751)
  • These findings demonstrate a new role of Gem/Gmip/RhoA signaling in cortical actin regulation during early mitotic stages. (PMID:25173885)
  • GEM and PPP1R13L were predicted as novel genes which may act as potential target or biomarkers of obesity as they occur with other 21 target genes with known obesity relationship. (PMID:31013288)
  • Ras-like Gem GTPase induced by Npas4 promotes activity-dependent neuronal tolerance for ischemic stroke. (PMID:34349016)
  • Direct inhibition of CaV2.3 by Gem is dynamin dependent and does not require a direct alfa/beta interaction. (PMID:34837834)
  • Decreased expression of GEM in osteoarthritis cartilage regulates chondrogenic differentiation via Wnt/beta-catenin signaling. (PMID:37794464)

Cross-species orthologs

3 orthologs

OrganismSymbolGene ID
danio_reriogemENSDARG00000029112
mus_musculusGemENSMUSG00000028214
rattus_norvegicusGemENSRNOG00000015160

Paralogs (35): RALA (ENSG00000006451), REM1 (ENSG00000088320), RASL10A (ENSG00000100276), RASD2 (ENSG00000100302), RASL12 (ENSG00000103710), RHEB (ENSG00000106615), RASD1 (ENSG00000108551), RERGL (ENSG00000111404), RAP1A (ENSG00000116473), RASL11A (ENSG00000122035), RAP2C (ENSG00000123728), RAP2A (ENSG00000125249), RRAS (ENSG00000126458), RAP1B (ENSG00000127314), RASL11B (ENSG00000128045), KRAS (ENSG00000133703), RRAS2 (ENSG00000133818), RERG (ENSG00000134533), REM2 (ENSG00000139890), RIT1 (ENSG00000143622), RALB (ENSG00000144118), RIT2 (ENSG00000152214), MRAS (ENSG00000158186), DIRAS3 (ENSG00000162595), DIRAS2 (ENSG00000165023), RRAD (ENSG00000166592), RHEBL1 (ENSG00000167550), NKIRAS2 (ENSG00000168256), HRAS (ENSG00000174775), DIRAS1 (ENSG00000176490), RAP2B (ENSG00000181467), ERAS (ENSG00000187682), NKIRAS1 (ENSG00000197885), NRAS (ENSG00000213281), RASL10B (ENSG00000270885)

Protein

Protein identifiers

GTP-binding protein GEMP55040 (reviewed: P55040)

Alternative names: GTP-binding mitogen-induced T-cell protein, RAS-like protein KIR

All UniProt accessions (2): E5RJF9, P55040

UniProt curated annotations — full annotation on UniProt →

Function. Could be a regulatory protein, possibly participating in receptor-mediated signal transduction at the plasma membrane. Has guanine nucleotide-binding activity but undetectable intrinsic GTPase activity.

Subunit / interactions. Interacts with calmodulin in a Ca(2+)-dependent manner. Binds ROCK1.

Subcellular location. Cell membrane.

Tissue specificity. Most abundant in thymus, spleen, kidney, lung, and testis. Less abundant in heart, brain, liver and skeletal muscle.

Post-translational modifications. Phosphorylated on tyrosine residues.

Induction. By mitogens.

Similarity. Belongs to the small GTPase superfamily. RGK family.

RefSeq proteins (2): NP_005252, NP_859053 (=MANE)

Domains & families (InterPro)

IDNameType
IPR001806Small_GTPaseFamily
IPR005225Small_GTP-bdDomain
IPR017358RGKFamily
IPR027417P-loop_NTPaseHomologous_superfamily
IPR051641RGK_GTP-binding_regFamily

Pfam: PF00071

UniProt features (28 total): helix 9, strand 6, region of interest 3, turn 3, binding site 2, sequence conflict 2, chain 1, compositionally biased region 1, sequence variant 1

Structure

Experimental structures (PDB)

3 structures.

PDBMethodResolution (Å)
2CJWX-RAY DIFFRACTION2.1
2G3YX-RAY DIFFRACTION2.4
2HT6X-RAY DIFFRACTION2.4

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-P55040-F172.500.42

Functional residue map

Curated UniProt residues grouped by drug-discovery relevance — catalytic, ligand-binding, modification, and mutation-validated positions. Source: UniProtKB sequence features.

Ligand- & substrate-binding residues (2): 82–89; 191–194

Function

Pathways and Gene Ontology

Reactome pathways

1 pathways

IDPathway
R-HSA-9768919NPAS4 regulates expression of target genes

MSigDB gene sets: 461 (showing top): GSE45365_NK_CELL_VS_BCELL_UP, ATF_B, GOBP_CHROMOSOME_ORGANIZATION, MODULE_255, YAO_HOXA10_TARGETS_VIA_PROGESTERONE_UP, ENK_UV_RESPONSE_KERATINOCYTE_UP, GOBP_CHROMOSOME_LOCALIZATION, GRAESSMANN_APOPTOSIS_BY_DOXORUBICIN_UP, GRAESSMANN_RESPONSE_TO_MC_AND_DOXORUBICIN_UP, MODULE_317, CREBP1_Q2, SARRIO_EPITHELIAL_MESENCHYMAL_TRANSITION_DN, NAGASHIMA_NRG1_SIGNALING_UP, CAGCTG_AP4_Q5, GRANDVAUX_IRF3_TARGETS_DN

GO Biological Process (7): mitotic cell cycle (GO:0000278), immune response (GO:0006955), signal transduction (GO:0007165), cell surface receptor signaling pathway (GO:0007166), chromosome organization (GO:0051276), metaphase chromosome alignment (GO:0051310), negative regulation of high voltage-gated calcium channel activity (GO:1901842)

GO Molecular Function (8): magnesium ion binding (GO:0000287), GTPase activity (GO:0003924), calcium channel regulator activity (GO:0005246), calmodulin binding (GO:0005516), GTP binding (GO:0005525), GDP binding (GO:0019003), nucleotide binding (GO:0000166), protein binding (GO:0005515)

GO Cellular Component (7): nucleus (GO:0005634), plasma membrane (GO:0005886), cytoplasmic side of plasma membrane (GO:0009898), midbody (GO:0030496), spindle midzone (GO:0051233), mitotic spindle (GO:0072686), membrane (GO:0016020)

Reactome top-level categories

Rollup of top-1 pathways:

CategoryPathways
Transcriptional Regulation by NPAS41

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
cellular anatomical structure3
guanyl ribonucleotide binding2
spindle2
cell cycle1
mitotic nuclear division1
immune system process1
response to stimulus1
cell communication1
cellular process1
signaling1
regulation of cellular process1
cellular response to stimulus1
signal transduction1
organelle organization1
chromosome localization1
nuclear chromosome segregation1
high voltage-gated calcium channel activity1
negative regulation of voltage-gated calcium channel activity1
metal ion binding1
ribonucleoside triphosphate phosphatase activity1
calcium channel activity1
ion channel regulator activity1
protein binding1
purine ribonucleoside triphosphate binding1
anion binding1
nucleoside phosphate binding1
heterocyclic compound binding1
binding1
intracellular membrane-bounded organelle1
membrane1
cell periphery1
plasma membrane1
cytoplasmic side of membrane1

Protein interactions and networks

STRING

1905 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
GEMKIF9Q9HAQ2911
GEMKIR2DL1P43626562
GEMGPATCH11Q8N954510
GEMCALM1P02593477
GEMCALML4Q96GE6472
GEMCALML6Q8TD86460
GEMCALML3P27482459
GEMCALML5Q9NZT1459
GEMHERC1Q15751426
GEMKCNMA1Q12791403
GEMSNX5Q9Y5X3349
GEMMDN1Q9NU22339
GEMMPP7Q5T2T1298
GEMFHL1Q13642296
GEMFRMPD2Q68DX3291

IntAct

435 interactions, top by confidence:

ABTypeScore
TRIM23GEMpsi-mi:“MI:0915”(physical association)0.820
TFIP11GEMpsi-mi:“MI:0915”(physical association)0.780
GEMTFIP11psi-mi:“MI:0915”(physical association)0.780
PDLIM7GEMpsi-mi:“MI:0915”(physical association)0.740
GEMAHCYL1psi-mi:“MI:0915”(physical association)0.720
GEMTRIM27psi-mi:“MI:0915”(physical association)0.720
GEMKRTAP10-7psi-mi:“MI:0915”(physical association)0.720
GOLGA2GEMpsi-mi:“MI:0915”(physical association)0.720
TRAF1GEMpsi-mi:“MI:0915”(physical association)0.720
KRT31GEMpsi-mi:“MI:0915”(physical association)0.720
KCTD9GEMpsi-mi:“MI:0915”(physical association)0.720
GEMINO80Epsi-mi:“MI:0915”(physical association)0.720
LZTS2GEMpsi-mi:“MI:0915”(physical association)0.720
GEMBLZF1psi-mi:“MI:0915”(physical association)0.720
IKZF3GEMpsi-mi:“MI:0915”(physical association)0.720
AHCYL1GEMpsi-mi:“MI:0915”(physical association)0.720
GEMGOLGA2psi-mi:“MI:0915”(physical association)0.720
GEMTRAF1psi-mi:“MI:0915”(physical association)0.720
GEMKCTD9psi-mi:“MI:0915”(physical association)0.720
INO80EGEMpsi-mi:“MI:0915”(physical association)0.720

BioGRID (164): GOLGA2 (Two-hybrid), KRT31 (Two-hybrid), TRIM27 (Two-hybrid), TCF4 (Two-hybrid), TRAF1 (Two-hybrid), BLZF1 (Two-hybrid), PNMA1 (Two-hybrid), AHCYL1 (Two-hybrid), RUNDC3A (Two-hybrid), IKZF3 (Two-hybrid), TFIP11 (Two-hybrid), KCTD9 (Two-hybrid), TRIM54 (Two-hybrid), CCDC102B (Two-hybrid), COG8 (Two-hybrid)

ESM2 similar proteins: A1DZY4, A6QP66, O35626, O35929, O88910, O88954, P0C0E4, P35295, P51157, P51158, P53667, P53668, P53669, P55040, P55041, P55043, P63032, P63033, Q06AU5, Q12829, Q13368, Q13637, Q3SWY9, Q5E9J3, Q5FVY2, Q5R541, Q5RFI2, Q6DGN0, Q6IMA3, Q6IMA7, Q6IMB1, Q6P0U3, Q6T310, Q8AVS6, Q8IYK8, Q8QFP8, Q8VEL9, Q8VHP8, Q8VHQ4, Q8WXH6

Diamond homologs: A1L1L6, F4J0W4, O59781, P0CO78, P0CO79, P31021, P34148, P34150, P39722, P55040, P55041, Q298L5, Q2HJF8, Q2UM43, Q32LU1, Q4I2W2, Q4PB75, Q4WN24, Q55G45, Q5ABR2, Q5B5L3, Q5E9M9, Q5R541, Q5ZM73, Q5ZM83, Q623S8, Q6C2J1, Q6CY37, Q6DIS1, Q6FIR8, Q6NVC5, Q758X6, Q7RZA2, Q7TSA0, Q864R5, Q8BG51, Q8IMX7, Q8IXI1, Q8IXI2, Q8JZN7

SIGNOR signaling

18 interactions.

AEffectBMechanism
GEM“down-regulates activity”CACNB2binding
GEM“down-regulates activity”ROCK2binding
CALM1“up-regulates activity”GEMbinding
CALM2“up-regulates activity”GEMbinding
CALM3“up-regulates activity”GEMbinding
YWHAG“up-regulates quantity by stabilization”GEMbinding
YWHAQ“up-regulates quantity by stabilization”GEMbinding
YWHAZ“up-regulates quantity by stabilization”GEMbinding

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 88 IntAct physical interaction partners (hypergeometric vs the genome-wide background, BH-FDR, gene-set size 15–500, ranked by fold). A functional readout of the neighbourhood — distinct from this gene’s own memberships above, and biased toward well-studied / hub proteins, so read it as themes rather than proof.

GO biological processes:

GO termPartnersFoldFDR
intermediate filament organization515.8×9e-03

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance34
Likely benign2
Benign2

Top pathogenic / likely-pathogenic (0)

SpliceAI

0 predictions. Top by Δscore:

AlphaMissense

1959 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
8:94250539:G:AS221F1.000
8:94250585:C:AG206W1.000
8:94250585:C:GG206R1.000
8:94250585:C:TG206R1.000
8:94252051:T:CD194G1.000
8:94252056:T:AK192N1.000
8:94252056:T:GK192N1.000
8:94252057:T:AK192I1.000
8:94252063:C:TG190D1.000
8:94252066:A:TV189D1.000
8:94252140:G:CS164R1.000
8:94252140:G:TS164R1.000
8:94252142:T:GS164R1.000
8:94252160:A:GS158P1.000
8:94260259:C:TG82E1.000
8:94260260:C:AG82W1.000
8:94250479:A:GL241P0.999
8:94250482:C:GR240P0.999
8:94250491:C:GR237P0.999
8:94250501:C:GG234R0.999
8:94250539:G:TS221Y0.999
8:94250540:A:GS221P0.999
8:94250550:G:CF217L0.999
8:94250550:G:TF217L0.999
8:94250552:A:GF217L0.999
8:94250556:G:CC215W0.999
8:94250557:C:TC215Y0.999
8:94250558:A:GC215R0.999
8:94250572:G:TA210E0.999
8:94250573:C:GA210P0.999

dbSNP variants (sampled 300 via entrez): RS1000203951 (8:94250109 C>A), RS1000230939 (8:94249230 G>A), RS1000328112 (8:94256293 TC>T), RS1000328441 (8:94262964 G>T), RS1000382830 (8:94262363 C>A,T), RS1000699755 (8:94256503 G>A), RS1000917685 (8:94261410 G>A,C,T), RS1001045851 (8:94255549 C>T), RS1001642594 (8:94258012 T>C), RS1001717806 (8:94258301 C>T), RS1001745189 (8:94261694 A>G,T), RS1001873012 (8:94252086 C>A,G,T), RS1002006318 (8:94261977 C>A), RS1002030620 (8:94264297 T>A,C), RS1002284407 (8:94251641 C>T)

Disease associations

OMIM: gene MIM:600164 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

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

GWAS associations

4 associations (top):

StudyTraitp-value
GCST004162_31Carotid plaque burden4.000000e-06
GCST005196_161Coronary artery disease1.000000e-06
GCST007269_224Pulse pressure5.000000e-11
GCST010866_131Coronary artery disease1.000000e-09

EFO canonical traits (2, from GWAS)

EFO IDTrait name
EFO:0006501carotid plaque build
EFO:0005763pulse pressure measurement

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

108 total (human), top 30 by PubMed support.

ChemicalActions (top 5)PubMed papers
Estradiolaffects cotreatment, increases expression, decreases expression, decreases reaction6
bisphenol Aincreases expression, affects cotreatment4
Silicon Dioxideincreases expression4
sodium arsenitedecreases expression, increases expression3
Acetaminophenincreases expression, affects response to substance3
Methotrexateaffects cotreatment, increases expression, decreases expression3
Valproic Acidaffects expression, increases expression3
Cyclosporineincreases expression3
Aflatoxin B1affects expression, increases expression3
Asbestos, Crocidoliteaffects expression, increases expression3
trichostatin Aaffects expression, decreases reaction, decreases expression, increases expression2
torcetrapibincreases expression2
(+)-JQ1 compoundaffects cotreatment, affects expression, decreases expression2
Benzo(a)pyreneincreases expression, increases methylation2
Calcitriolincreases expression2
Copperdecreases expression, increases expression, affects binding2
Dexamethasonedecreases expression, affects cotreatment, increases expression2
Doxorubicinaffects expression, decreases expression2
Phenylmercuric Acetatedecreases expression, affects cotreatment2
Tobacco Smoke Pollutionaffects expression, increases expression2
Cadmium Chlorideincreases expression2
Thapsigarginincreases expression2
aristolochic acid Iincreases expression1
bisphenol Faffects cotreatment, increases expression1
methylmercuric chlorideincreases expression1
methyleugenolincreases expression1
senecionineincreases expression1
senkirkineincreases expression1
heliotrineincreases expression1
2-methyl-4-isothiazolin-3-oneincreases expression1

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.