FBXL18

gene
On this page

Also known as FLJ11467Fbl18

Summary

FBXL18 (F-box and leucine rich repeat protein 18, HGNC:21874) is a protein-coding gene on chromosome 7p22.1, encoding F-box/LRR-repeat protein 18 (Q96ME1). Substrate-recognition component of the SCF (SKP1-CUL1-F-box protein)-type E3 ubiquitin ligase complex.

The protein encoded by this gene is a member of a family of proteins that contain an approximately 40-amino acid F-box motif. This motif is important for interaction with SKP1 and for targeting some proteins for degradation. The encoded protein has been shown to control the cellular level of FBXL7, a protein that induces mitotic arrest, by targeting it for polyubiquitylation and proteasomal degradation. Members of the F-box protein family, such as FBXL18, are characterized by an approximately 40-amino acid F-box motif. F-box proteins interact with SKP1 through the F box, and they interact with ubiquitination targets through other protein interaction domains.

Source: NCBI Gene 80028 — RefSeq curated summary.

At a glance

  • GWAS associations: 8
  • Clinical variants (ClinVar): 113 total
  • MANE Select transcript: NM_024963

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:21874
Approved symbolFBXL18
NameF-box and leucine rich repeat protein 18
Location7p22.1
Locus typegene with protein product
StatusApproved
AliasesFLJ11467, Fbl18
Ensembl geneENSG00000155034
Ensembl biotypeprotein_coding
OMIM609084
Entrez80028

Gene structure

Transcript identifiers

Ensembl transcripts: 4 — 3 protein_coding, 1 nonsense_mediated_decay

ENST00000382368, ENST00000415009, ENST00000458142, ENST00000948868

RefSeq mRNA: 6 — MANE Select: NM_024963 NM_001321213, NM_001363441, NM_001363442, NM_001367780, NM_001367781, NM_024963

CCDS: CCDS43546

Canonical transcript exons

ENST00000382368 — 5 exons

ExonStartEnd
ENSE0000101885555054125505630
ENSE0000112679655136575513809
ENSE0000149186754757975481931
ENSE0000171368854912315491449
ENSE0000215045155004885502031

Expression profiles

Bgee: expression breadth ubiquitous, 208 present calls, max score 90.14.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 15.5221 / max 116.5308, expressed in 1795 samples.

FANTOM5 promoters (1 alternative TSS)

Promoter IDTPM avgSamples expressed
8258115.52211795

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
vena cavaUBERON:000408790.14gold quality
lateral globus pallidusUBERON:000247689.68silver quality
buccal mucosa cellCL:000233688.96silver quality
lateral nuclear group of thalamusUBERON:000273687.45silver quality
entorhinal cortexUBERON:000272886.19gold quality
cardia of stomachUBERON:000116285.79silver quality
postcentral gyrusUBERON:000258185.67gold quality
substantia nigra pars compactaUBERON:000196585.66silver quality
parietal lobeUBERON:000187285.35gold quality
superior frontal gyrusUBERON:000266184.94gold quality
ventral tegmental areaUBERON:000269184.58silver quality
ponsUBERON:000098884.41silver quality
oocyteCL:000002384.08gold quality
inferior vagus X ganglionUBERON:000536383.76silver quality
tendon of biceps brachiiUBERON:000818883.06gold quality
Brodmann (1909) area 46UBERON:000648382.65silver quality
globus pallidusUBERON:000187582.61gold quality
superior vestibular nucleusUBERON:000722782.23silver quality
pharyngeal mucosaUBERON:000035582.04gold quality
superior surface of tongueUBERON:000737181.85gold quality
saphenous veinUBERON:000731881.82silver quality
middle temporal gyrusUBERON:000277181.71gold quality
epithelium of nasopharynxUBERON:000195181.54gold quality
medial globus pallidusUBERON:000247781.42gold quality
CA1 field of hippocampusUBERON:000388181.31silver quality
nippleUBERON:000203081.19silver quality
Brodmann (1909) area 23UBERON:001355480.99gold quality
renal medullaUBERON:000036280.49silver quality
cerebellar vermisUBERON:000472080.29gold quality
skeletal muscle tissue of rectus abdominisUBERON:000451180.05gold quality

Single-cell (SCXA)

Detected in 2 experiment(s), a significant marker in 0.

ExperimentMarker?Max mean expression
E-MTAB-6379no6.68
E-ANND-3no4.65

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

183 targeting FBXL18, 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-5011-5P100.0083.465820
HSA-MIR-190A-3P100.0080.355520
HSA-MIR-8485100.0077.574731
HSA-MIR-4481100.0066.421669
HSA-MIR-4673100.0066.641490
HSA-MIR-6798-5P100.0065.77699
HSA-MIR-3064-3P100.0070.091254
HSA-MIR-3613-3P100.0076.367965
HSA-MIR-4692100.0067.322066
HSA-MIR-371B-5P99.9975.344759
HSA-MIR-451499.9967.101870
HSA-MIR-373-5P99.9875.364753
HSA-MIR-616-5P99.9875.584775
HSA-MIR-103A-3P99.9869.141595
HSA-MIR-10799.9869.141595
HSA-MIR-4645-5P99.9865.811284
HSA-MIR-23B-5P99.9866.07587
HSA-MIR-4745-5P99.9865.951028
HSA-MIR-6793-5P99.9765.95758
HSA-MIR-302C-5P99.9772.563642
HSA-MIR-6778-3P99.9667.292693
HSA-MIR-302E99.9670.742669
HSA-MIR-23A-5P99.9465.39468
HSA-MIR-6768-5P99.9267.361942
HSA-MIR-498-3P99.9171.271114
HSA-MIR-454-3P99.9174.011925
HSA-MIR-130A-3P99.9073.311861
HSA-MIR-130B-3P99.9073.271850
HSA-MIR-301A-3P99.9073.151839
HSA-MIR-301B-3P99.9073.191836

Literature-anchored findings (GeneRIF, showing 3)

  • Fbxl18 regulates apoptosis by mediating ubiquitin-dependent proteasomal degradation of the pro-apoptotic protein Fbxl7 that may impact cellular processes involved in cell cycle progression. (PMID:25654763)
  • Study showed that LRRK2 phosphorylation is required for LRRK2 to bind to Fbxl18, and that this interaction is important for regulating the amount of LRRK2 via ubiquitination of LRRK2 by the SCFFbxl18 ubiquitin ligase and subsequent proteasomal degradation of LRRK2. We also show that LRRK2 can induce caspase 8 mediated cell death and that the degradation of LRRK2 mediated by Fbxl18 can prevent LRRK2-mediated toxicity. (PMID:27890708)
  • FBXL18 plays an oncogenic role through promoting lysine 63-linked ubiquitination of Akt in glioma. (PMID:27926990)

Cross-species orthologs

31 orthologs

OrganismSymbolGene ID
danio_reriofbxl18ENSDARG00000007443
mus_musculusFbxl18ENSMUSG00000066640
rattus_norvegicusFbxl18ENSRNOG00000001117
rattus_norvegicusFbxl18l1ENSRNOG00000062659
drosophila_melanogasterCG15056FBGN0030918
drosophila_melanogasterCG8272FBGN0033337
drosophila_melanogasterCG9003FBGN0033639
drosophila_melanogasterSkp2FBGN0037236
drosophila_melanogasterCG14891FBGN0038445
drosophila_melanogasterCG5003FBGN0039554
drosophila_melanogasterFipoQFBGN0039667
caenorhabditis_elegansWBGENE00007206
caenorhabditis_elegansWBGENE00007208
caenorhabditis_elegansWBGENE00007887
caenorhabditis_elegansWBGENE00008177
caenorhabditis_elegansWBGENE00009689
caenorhabditis_elegansgadr-6WBGENE00009823
caenorhabditis_elegansWBGENE00010365
caenorhabditis_elegansK05C4.9WBGENE00010585
caenorhabditis_elegansWBGENE00012655
caenorhabditis_elegansWBGENE00015350
caenorhabditis_elegansWBGENE00018561
caenorhabditis_elegansWBGENE00018613
caenorhabditis_elegansWBGENE00018766
caenorhabditis_elegansWBGENE00019239
caenorhabditis_elegansWBGENE00020884
caenorhabditis_elegansWBGENE00021053
caenorhabditis_elegansWBGENE00021180
caenorhabditis_eleganszeel-1WBGENE00021463
caenorhabditis_elegansWBGENE00044459
caenorhabditis_elegansgadr-5WBGENE00045058

Paralogs (15): FBXL3 (ENSG00000005812), FBXL19 (ENSG00000099364), FBXL15 (ENSG00000107872), FBXL20 (ENSG00000108306), FBXL4 (ENSG00000112234), FBXL5 (ENSG00000118564), FBXL16 (ENSG00000127585), SKP2 (ENSG00000145604), FBXL17 (ENSG00000145743), FBXL2 (ENSG00000153558), FBXL13 (ENSG00000161040), FBXL14 (ENSG00000171823), FBXL6 (ENSG00000182325), FBXL7 (ENSG00000183580), FBXL22 (ENSG00000197361)

Protein

Protein identifiers

F-box/LRR-repeat protein 18Q96ME1 (reviewed: Q96ME1)

Alternative names: F-box and leucine-rich repeat protein 18

All UniProt accessions (2): Q96ME1, A0A994ENR3

UniProt curated annotations — full annotation on UniProt →

Function. Substrate-recognition component of the SCF (SKP1-CUL1-F-box protein)-type E3 ubiquitin ligase complex.

Subunit / interactions. Directly interacts with SKP1 and CUL1.

Isoforms (5)

UniProt IDNamesCanonical?
Q96ME1-44yes
Q96ME1-11
Q96ME1-22
Q96ME1-33
Q96ME1-55

RefSeq proteins (6): NP_001308142, NP_001350370, NP_001350371, NP_001354709, NP_001354710, NP_079239* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR001810F-box_domDomain
IPR032675LRR_dom_sfHomologous_superfamily
IPR036047F-box-like_dom_sfHomologous_superfamily
IPR045627FBXL18_LRRDomain
IPR047948FBXL18_F-boxDomain

Pfam: PF12937, PF19729

UniProt features (27 total): repeat 12, splice variant 6, sequence conflict 4, sequence variant 3, chain 1, domain 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q96ME1-F187.440.72

Function

Pathways and Gene Ontology

Reactome pathways

3 pathways

IDPathway
R-HSA-8854050FBXL7 down-regulates AURKA during mitotic entry and in early mitosis
R-HSA-8951664Neddylation
R-HSA-983168Antigen processing: Ubiquitination & Proteasome degradation

MSigDB gene sets: 111 (showing top): RNGTGGGC_UNKNOWN, BUYTAERT_PHOTODYNAMIC_THERAPY_STRESS_DN, REACTOME_ADAPTIVE_IMMUNE_SYSTEM, REACTOME_CLASS_I_MHC_MEDIATED_ANTIGEN_PROCESSING_PRESENTATION, REACTOME_ANTIGEN_PROCESSING_UBIQUITINATION_PROTEASOME_DEGRADATION, GOBP_MACROMOLECULE_CATABOLIC_PROCESS, chr7p22, GATA1_04, GATA1_03, MAF_Q6, GOBP_SCF_DEPENDENT_PROTEASOMAL_UBIQUITIN_DEPENDENT_PROTEIN_CATABOLIC_PROCESS, GOBP_PROTEASOMAL_PROTEIN_CATABOLIC_PROCESS, NIKOLSKY_BREAST_CANCER_7P22_AMPLICON, GOBP_PROTEIN_CATABOLIC_PROCESS, GINESTIER_BREAST_CANCER_ZNF217_AMPLIFIED_DN

GO Biological Process (1): SCF-dependent proteasomal ubiquitin-dependent protein catabolic process (GO:0031146)

GO Molecular Function (1): protein binding (GO:0005515)

GO Cellular Component (1): cytosol (GO:0005829)

Reactome top-level categories

Rollup of top-3 pathways:

CategoryPathways
G2/M Transition1
Post-translational protein modification1
Class I MHC mediated antigen processing & presentation1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
proteasome-mediated ubiquitin-dependent protein catabolic process1
binding1
cytoplasm1
cellular anatomical structure1

Protein interactions and networks

STRING

578 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
FBXL18SKP1P34991834
FBXL18CUL1Q13616729
FBXL18RBX1P62877614
FBXL18FBXL7Q9UJT9495
FBXL18FBXL14Q8N1E6456
FBXL18RNF216Q9NWF9420
FBXL18FBXO21O94952385
FBXL18FBXL2Q9UKC9383
FBXL18FBXL6Q8N531374
FBXL18FBXL22Q6P050374
FBXL18FBXO9Q9UK97345
FBXL18FBXL20Q96IG2337
FBXL18FBXO45P0C2W1326
FBXL18FBXL12Q9NXK8313
FBXL18FBXO7Q9Y3I1310

IntAct

33 interactions, top by confidence:

ABTypeScore
SKP1MYCBP2psi-mi:“MI:0914”(association)0.640
CUL1FBXO21psi-mi:“MI:0914”(association)0.600
FBXL18WWP2psi-mi:“MI:0915”(physical association)0.550
SKP2DPYSL4psi-mi:“MI:0914”(association)0.530
MAGEA1MAGEB3psi-mi:“MI:0914”(association)0.530
FBXL16UBBpsi-mi:“MI:0914”(association)0.530
IRGCRAP1GDS1psi-mi:“MI:0914”(association)0.530
FBXL18DHRS2psi-mi:“MI:0915”(physical association)0.400
FBXL18HSP90AB1psi-mi:“MI:0915”(physical association)0.400
FBXL18E7psi-mi:“MI:0915”(physical association)0.370
FBXL18WWP2psi-mi:“MI:0915”(physical association)0.370
CUL1LGALS8psi-mi:“MI:0914”(association)0.350
COPS5FBLL1psi-mi:“MI:0914”(association)0.350
COPS6DDX3Xpsi-mi:“MI:0914”(association)0.350
DUSP16MEIOCpsi-mi:“MI:0914”(association)0.350
LYPD4PIK3C2Apsi-mi:“MI:0914”(association)0.350
SKP1BHLHE40psi-mi:“MI:0914”(association)0.350
TTC9CPLD2psi-mi:“MI:0914”(association)0.350
TBL1YHDAC3psi-mi:“MI:0914”(association)0.350
RBX1OBSL1psi-mi:“MI:0914”(association)0.350
MOCS3HSPA8psi-mi:“MI:0914”(association)0.350
ATG7IFT56psi-mi:“MI:0914”(association)0.350
SKP1RNASET2psi-mi:“MI:0914”(association)0.350
MAGEA1ANKRD17psi-mi:“MI:0914”(association)0.350
SKP2ZNF195psi-mi:“MI:0914”(association)0.350

BioGRID (86): FBXL18 (Two-hybrid), FBXL18 (Two-hybrid), FBXL18 (Two-hybrid), FBXL18 (Two-hybrid), FBXL18 (Two-hybrid), FBXL18 (Two-hybrid), FBXL18 (Two-hybrid), FBXL18 (Two-hybrid), FBXL18 (Two-hybrid), FBXL18 (Two-hybrid), FBXL18 (Two-hybrid), FBXL18 (Two-hybrid), FBXL18 (Two-hybrid), FBXL18 (Two-hybrid), FBXL18 (Two-hybrid)

ESM2 similar proteins: A1A5X2, A2RT62, A3KMV1, A4IIK1, B3FL73, F4HX15, P0C192, P0C5J9, P0CC10, Q09299, Q17R01, Q2T9W8, Q32KX5, Q32PG9, Q38SD2, Q3TX51, Q3UHC2, Q3V1N1, Q3ZBA7, Q4G017, Q570C0, Q5BJ29, Q5MJ12, Q65XV2, Q6GLE8, Q6P7W2, Q80TM9, Q86V97, Q86X40, Q8BFZ4, Q8BID8, Q8C4V4, Q8N1E6, Q8N461, Q8TBC3, Q8W104, Q8WVZ9, Q96ME1, Q9EPX5, Q9LW29

SIGNOR signaling

3 interactions.

AEffectBMechanism
FBXL18“down-regulates quantity by destabilization”ERCC3binding
FBXL18“down-regulates quantity by destabilization”FBXL7binding
FBXL18“up-regulates activity”“Cullin 1-RBX1-Skp1”binding

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 42 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.

Reactome pathways:

PathwayPartnersFoldFDR
NOTCH1 Intracellular Domain Regulates Transcription542.5×9e-06
GSK3B-mediated proteasomal degradation of PD-L1(CD274)542.5×9e-06
Constitutive Signaling by NOTCH1 PEST Domain Mutants535.2×1e-05
Constitutive Signaling by NOTCH1 HD+PEST Domain Mutants535.2×1e-05
Regulation of RUNX2 expression and activity532.4×2e-05
Orc1 removal from chromatin531.9×2e-05
Neddylation1016.9×3e-08
Antigen processing: Ubiquitination & Proteasome degradation810.6×2e-05

GO biological processes:

GO termPartnersFoldFDR
SCF-dependent proteasomal ubiquitin-dependent protein catabolic process548.0×2e-05
protein K48-linked ubiquitination521.6×5e-04

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance92
Likely benign5
Benign2

Top pathogenic / likely-pathogenic (0)

SpliceAI

1528 predictions. Top by Δscore:

VariantEffectΔscore
7:5481930:AG:Aacceptor_gain1.0000
7:5481932:C:CCacceptor_gain1.0000
7:5481938:C:CTacceptor_gain1.0000
7:5491226:CTCA:Cdonor_loss1.0000
7:5491227:TCAC:Tdonor_loss1.0000
7:5491228:CACCT:Cdonor_loss1.0000
7:5491229:A:ACdonor_gain1.0000
7:5491230:C:CCdonor_gain1.0000
7:5491230:C:CTdonor_loss1.0000
7:5491230:CCTG:Cdonor_gain1.0000
7:5491445:CCAGC:Cacceptor_gain1.0000
7:5491446:CAGC:Cacceptor_gain1.0000
7:5491446:CAGCC:Cacceptor_gain1.0000
7:5491447:AGC:Aacceptor_gain1.0000
7:5491447:AGCC:Aacceptor_loss1.0000
7:5491448:GC:Gacceptor_gain1.0000
7:5491448:GCCT:Gacceptor_loss1.0000
7:5491449:CC:Cacceptor_gain1.0000
7:5491450:C:CCacceptor_gain1.0000
7:5491451:T:Gacceptor_loss1.0000
7:5502027:CTCGC:Cacceptor_gain1.0000
7:5502028:TCGC:Tacceptor_gain1.0000
7:5502029:CGCC:Cacceptor_gain1.0000
7:5502032:CTGC:Cacceptor_loss1.0000
7:5502046:CAGGG:Cacceptor_gain1.0000
7:5505407:CTCA:Cdonor_loss1.0000
7:5505408:TCACC:Tdonor_loss1.0000
7:5505409:CACCT:Cdonor_loss1.0000
7:5505410:A:ACdonor_gain1.0000
7:5505410:A:Tdonor_loss1.0000

AlphaMissense

4668 scored. Top likely-pathogenic:

dbSNP variants (sampled 300 via entrez): RS1000003585 (7:5493205 C>T), RS1000004388 (7:5464128 G>A), RS1000013631 (7:5472624 G>A), RS1000060219 (7:5483994 G>A), RS1000098776 (7:5463972 C>T), RS1000168022 (7:5468174 G>A), RS1000178261 (7:5497452 T>C), RS1000209760 (7:5455713 T>A), RS1000348757 (7:5471974 C>T), RS1000374751 (7:5507690 G>A), RS1000414862 (7:5476811 C>G,T), RS1000428663 (7:5507883 C>T), RS1000442709 (7:5513765 C>A), RS1000458279 (7:5493421 G>A,C,T), RS1000473064 (7:5502958 C>T)

Disease associations

OMIM: gene MIM:609084 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

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

GWAS associations

8 associations (top):

StudyTraitp-value
GCST002183_6Relative hand skill in reading disability4.000000e-06
GCST003139_17Glomerular filtration rate in chronic kidney disease4.000000e-06
GCST006284_14Plasma proprotein convertase subtilisin/kexin type 9 levels in stable coronary artery disease2.000000e-06
GCST006284_5Plasma proprotein convertase subtilisin/kexin type 9 levels in stable coronary artery disease7.000000e-09
GCST90002380_41Basophil percentage of white cells1.000000e-11
GCST90002385_177High light scatter reticulocyte count8.000000e-12
GCST90002394_183Monocyte percentage of white cells4.000000e-13
GCST90002395_680Mean platelet volume1.000000e-09

EFO canonical traits (5, from GWAS)

EFO IDTrait name
EFO:0009902handedness
EFO:0006899PCSK9 protein measurement
EFO:0007992basophil percentage of leukocytes
EFO:0007986reticulocyte count
EFO:0007989monocyte percentage of leukocytes

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

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

ChemicalActions (top 5)PubMed papers
Valproic Aciddecreases expression, increases expression, increases methylation3
sodium arseniteincreases expression2
Benzo(a)pyreneaffects methylation2
aristolochic acid Iincreases expression1
dicrotophosincreases expression1
2,4,6-tribromophenoldecreases expression1
bisphenol Aaffects cotreatment, decreases methylation1
titanium dioxidedecreases methylation1
decabromobiphenyl etherdecreases expression1
trichostatin Aaffects expression1
afimoxifenedecreases expression, decreases reaction1
tetrabromobisphenol Adecreases expression1
2,2’,4,4’-tetrabromodiphenyl etherdecreases expression1
pentabrominated diphenyl ether 100decreases expression1
hexabrominated diphenyl ether 153decreases expression1
Resveratrolaffects cotreatment, decreases expression1
Fulvestrantaffects cotreatment, decreases methylation1
Air Pollutantsaffects expression, increases abundance1
Arsenicaffects methylation1
Cisplatindecreases expression1
Estrogensdecreases expression, decreases reaction1
Methyl Methanesulfonateincreases expression1
Ozoneaffects expression, increases abundance1
Phthalic Acidsdecreases methylation1
Plant Extractsdecreases expression, affects cotreatment1
Rotenonedecreases expression1
Thiramincreases expression1
Urethaneincreases expression1
Cyclosporinedecreases expression1
Cadmium Chlorideincreases 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.