LRFN4

gene
On this page

Also known as MGC3103SALM3.FIGLER6

Summary

LRFN4 (leucine rich repeat and fibronectin type III domain containing 4, HGNC:28456) is a protein-coding gene on chromosome 11q13.2, encoding Leucine-rich repeat and fibronectin type-III domain-containing protein 4 (Q6PJG9). Promotes neurite outgrowth in hippocampal neurons.

Predicted to be involved in regulation of postsynaptic density assembly; regulation of presynapse assembly; and synaptic membrane adhesion. Predicted to be located in plasma membrane. Predicted to be active in several cellular components, including GABA-ergic synapse; glutamatergic synapse; and postsynaptic density membrane.

Source: NCBI Gene 78999 — RefSeq curated summary.

At a glance

  • GWAS associations: 3
  • Clinical variants (ClinVar): 113 total — 3 pathogenic
  • MANE Select transcript: NM_024036

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:28456
Approved symbolLRFN4
Nameleucine rich repeat and fibronectin type III domain containing 4
Location11q13.2
Locus typegene with protein product
StatusApproved
AliasesMGC3103, SALM3., FIGLER6
Ensembl geneENSG00000173621
Ensembl biotypeprotein_coding
OMIM612810
Entrez78999

Gene structure

Transcript identifiers

Ensembl transcripts: 4 — 3 protein_coding, 1 protein_coding_CDS_not_defined

ENST00000309602, ENST00000393952, ENST00000531590, ENST00000939890

RefSeq mRNA: 2 — MANE Select: NM_024036 NM_001363524, NM_024036

CCDS: CCDS8153

Canonical transcript exons

ENST00000309602 — 2 exons

ExonStartEnd
ENSE000011876816685963766860475
ENSE000011876926685706466859093

Expression profiles

Bgee: expression breadth ubiquitous, 214 present calls, max score 93.03.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 13.6621 / max 109.5274, expressed in 1761 samples.

FANTOM5 promoters (4 alternative TSS)

Promoter IDTPM avgSamples expressed
1153788.76571688
1153762.18021079
1153751.6892949
1153771.0270562

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
ganglionic eminenceUBERON:000402393.03gold quality
cortical plateUBERON:000534391.52gold quality
right hemisphere of cerebellumUBERON:001489091.39gold quality
cerebellar hemisphereUBERON:000224590.24gold quality
cerebellar cortexUBERON:000212990.16gold quality
mucosa of transverse colonUBERON:000499190.04gold quality
cerebellumUBERON:000203789.09gold quality
apex of heartUBERON:000209888.17gold quality
right frontal lobeUBERON:000281087.49gold quality
anterior cingulate cortexUBERON:000983585.33gold quality
embryoUBERON:000092285.24gold quality
cingulate cortexUBERON:000302785.24gold quality
right uterine tubeUBERON:000130285.06gold quality
stromal cell of endometriumCL:000225584.29gold quality
amygdalaUBERON:000187684.23gold quality
deciduaUBERON:000245084.23gold quality
sural nerveUBERON:001548884.20gold quality
right testisUBERON:000453483.99gold quality
Brodmann (1909) area 9UBERON:001354083.97gold quality
left testisUBERON:000453383.94gold quality
transverse colonUBERON:000115783.73gold quality
tibial nerveUBERON:000132383.60gold quality
neocortexUBERON:000195083.48gold quality
prefrontal cortexUBERON:000045183.39gold quality
dorsolateral prefrontal cortexUBERON:000983483.29gold quality
frontal cortexUBERON:000187083.06gold quality
ventricular zoneUBERON:000305382.50gold quality
cerebral cortexUBERON:000095682.41gold quality
left adrenal gland cortexUBERON:003582582.01gold quality
endocervixUBERON:000045881.88gold quality

Single-cell (SCXA)

Detected in 1 experiment(s), a significant marker in 0.

ExperimentMarker?Max mean expression
E-ANND-3no1.19

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

31 targeting LRFN4, 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-340-5P100.0072.504437
HSA-MIR-4795-3P100.0074.624024
HSA-MIR-450099.9972.722367
HSA-LET-7A-5P99.9872.291790
HSA-LET-7B-5P99.9872.311790
HSA-LET-7C-5P99.9872.291790
HSA-LET-7E-5P99.9872.291790
HSA-LET-7F-5P99.9872.561784
HSA-LET-7G-5P99.9872.371784
HSA-LET-7I-5P99.9872.371788
HSA-MIR-98-5P99.9872.331787
HSA-MIR-590-3P99.9674.346478
HSA-LET-7D-5P99.9671.761632
HSA-MIR-445899.9671.641650
HSA-MIR-6768-5P99.9267.361942
HSA-MIR-7162-3P99.8968.161682
HSA-MIR-548D-3P99.8770.674362
HSA-MIR-548BB-3P99.8670.584354
HSA-MIR-3663-3P99.8470.39798
HSA-MIR-202-3P99.8471.411290
HSA-MIR-548AC99.8470.774351
HSA-MIR-548H-3P99.8470.804349
HSA-MIR-548Z99.8470.804349
HSA-MIR-6752-3P99.7266.711587
HSA-MIR-425199.4069.193363
HSA-MIR-544B99.1867.411632
HSA-MIR-6804-3P98.7264.82852
HSA-MIR-210-5P98.5764.37832
HSA-MIR-444398.0266.251928
HSA-MIR-6793-3P97.6665.781084

Literature-anchored findings (GeneRIF, showing 5)

  • Data indicate that LRFN4 signaling plays an important role in the migration of monocytes/macrophages. (PMID:21704618)
  • LRFN4 complexed with 14-3-3s and NCK1 to mediate elongation in monocytic cells via Rac-1-mediated actin cytoskeleton reorganization (PMID:22677168)
  • SALM3 regulates excitatory synapse development and locomotion behavior. (PMID:26321637)
  • SALM3 is overexpressed in the tumor cells and fibroblasts of gastric cancer patients. High SALM3 expression is associated with poor prognosis. (PMID:31089399)
  • [Expression and clinical significance of LRFN4 in colorectal cancer tissue]. (PMID:32536098)

Cross-species orthologs

2 orthologs

OrganismSymbolGene ID
mus_musculusLrfn4ENSMUSG00000045045
rattus_norvegicusLrfn4ENSRNOG00000019356

Paralogs (25): SLITRK3 (ENSG00000121871), LRFN3 (ENSG00000126243), LRFN1 (ENSG00000128011), SLIT2 (ENSG00000145147), LRFN2 (ENSG00000156564), LRRC38 (ENSG00000162494), SLITRK5 (ENSG00000165300), LRFN5 (ENSG00000165379), LRTM2 (ENSG00000166159), LINGO1 (ENSG00000169783), LRRN2 (ENSG00000170382), LRRN3 (ENSG00000173114), LINGO2 (ENSG00000174482), LRRN1 (ENSG00000175928), SLITRK1 (ENSG00000178235), GP5 (ENSG00000178732), SLITRK4 (ENSG00000179542), LRRC55 (ENSG00000183908), SLIT3 (ENSG00000184347), SLITRK6 (ENSG00000184564), SLITRK2 (ENSG00000185985), LRRC70 (ENSG00000186105), SLIT1 (ENSG00000187122), TLR9 (ENSG00000239732), TPBGL (ENSG00000261594)

Protein

Protein identifiers

Leucine-rich repeat and fibronectin type-III domain-containing protein 4Q6PJG9 (reviewed: Q6PJG9)

All UniProt accessions (2): Q6PJG9, E7ENX6

UniProt curated annotations — full annotation on UniProt →

Function. Promotes neurite outgrowth in hippocampal neurons. May play a role in redistributing DLG4 to the cell periphery.

Subunit / interactions. Can form heteromeric complexes with LRFN1, LRFN2, LRFN3 and LRFN5. Unable to form homophilic interactions across cell junctions. Interacts with DLG1, DLG2, DLG3 and DLG4.

Subcellular location. Membrane.

Post-translational modifications. Glycosylated.

Domain organisation. The PDZ-binding motif is required for neurite outgrowth promotion. This motif is also involved in DLG1-, DLG3- and DLG4-binding.

Similarity. Belongs to the LRFN family.

RefSeq proteins (2): NP_001350453, NP_076941* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR000483Cys-rich_flank_reg_CDomain
IPR001611Leu-rich_rptRepeat
IPR003591Leu-rich_rpt_typical-subtypRepeat
IPR003598Ig_sub2Domain
IPR003599Ig_subDomain
IPR003961FN3_domDomain
IPR007110Ig-like_domDomain
IPR013098Ig_I-setDomain
IPR013783Ig-like_foldHomologous_superfamily
IPR032675LRR_dom_sfHomologous_superfamily
IPR036116FN3_sfHomologous_superfamily
IPR036179Ig-like_dom_sfHomologous_superfamily
IPR050467LRFNFamily

Pfam: PF00041, PF00560, PF07679, PF13855

UniProt features (31 total): repeat 7, glycosylation site 6, domain 4, region of interest 2, topological domain 2, modified residue 2, signal peptide 1, chain 1, short sequence motif 1, compositionally biased region 1, disulfide bond 1, sequence variant 1, transmembrane region 1, mutagenesis site 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q6PJG9-F178.250.54

Functional residue map

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

Post-translational modifications (2): 585, 626

Disulfide bonds (1): 302–351

Glycosylation sites (6): 25, 70, 324, 333, 376, 440

Mutagenesis-validated functional residues (1):

PositionPhenotype
633–635loss of dlg1-, dlg3- and dlg4-binding.

Function

Pathways and Gene Ontology

Reactome pathways

3 pathways

IDPathway
R-HSA-8849932Synaptic adhesion-like molecules
R-HSA-112316Neuronal System
R-HSA-6794362Protein-protein interactions at synapses

MSigDB gene sets: 138 (showing top): GAANYNYGACNY_UNKNOWN, GOBP_SYNAPSE_ASSEMBLY, GOCC_CELL_SURFACE, AREB6_01, GOBP_REGULATION_OF_CELL_JUNCTION_ASSEMBLY, TGACCTY_ERR1_Q2, GOBP_REGULATION_OF_CELLULAR_COMPONENT_BIOGENESIS, GGGTGGRR_PAX4_03, chr11q13, CEBPB_01, COUP_01, GOBP_CELL_CELL_ADHESION, WEI_MYCN_TARGETS_WITH_E_BOX, GOBP_CELL_JUNCTION_ORGANIZATION, RICKMAN_TUMOR_DIFFERENTIATED_WELL_VS_POORLY_DN

GO Biological Process (3): regulation of postsynaptic density assembly (GO:0099151), synaptic membrane adhesion (GO:0099560), regulation of presynapse assembly (GO:1905606)

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

GO Cellular Component (6): plasma membrane (GO:0005886), cell surface (GO:0009986), postsynaptic density membrane (GO:0098839), glutamatergic synapse (GO:0098978), GABA-ergic synapse (GO:0098982), membrane (GO:0016020)

Reactome top-level categories

Rollup of top-2 pathways:

CategoryPathways
Protein-protein interactions at synapses1
Neuronal System1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
cellular anatomical structure2
synapse2
postsynaptic density assembly1
regulation of postsynaptic specialization assembly1
regulation of excitatory synapse assembly1
regulation of postsynaptic density organization1
synapse organization1
cell-cell adhesion1
regulation of synapse assembly1
presynapse assembly1
regulation of presynapse organization1
binding1
membrane1
cell periphery1
postsynaptic density1
postsynaptic membrane1
postsynaptic specialization membrane1

Protein interactions and networks

STRING

1382 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
LRFN4PTPRSQ13332816
LRFN4IL1RAPL1Q9NZN1752
LRFN4DLG4P78352692
LRFN4IL1RAPQ9NPH3667
LRFN4FN1P02751601
LRFN4SLC32A1Q9H598474
LRFN4NTNG1Q9Y2I2466
LRFN4NTRK3Q16288464
LRFN4SYPP08247462
LRFN4POMGNT1Q8WZA1459
LRFN4NTNG2Q96CW9443
LRFN4EFHBQ8N7U6441
LRFN4NRXN2Q9P2S2430
LRFN4KLC2Q9H0B6430
LRFN4KLC3Q6P597429

IntAct

85 interactions, top by confidence:

ABTypeScore
LRFN4NCK2psi-mi:“MI:0914”(association)0.730
BMAL1CLOCKpsi-mi:“MI:0914”(association)0.720
LRFN4NCK1psi-mi:“MI:0914”(association)0.690
NCK2SH3PXD2Bpsi-mi:“MI:0914”(association)0.640
STX7SNAP23psi-mi:“MI:0914”(association)0.640
MPDZSMCHD1psi-mi:“MI:0914”(association)0.590
LRFN4NOTCH2NLApsi-mi:“MI:0915”(physical association)0.560
NOTCH2NLALRFN4psi-mi:“MI:0915”(physical association)0.560
LRFN4P4HBpsi-mi:“MI:0915”(physical association)0.560
KRTAP1-1LRFN4psi-mi:“MI:0915”(physical association)0.560
LRFN4ADAMTSL4psi-mi:“MI:0915”(physical association)0.560
KRTAP10-8LRFN4psi-mi:“MI:0915”(physical association)0.560
KRTAP1-3LRFN4psi-mi:“MI:0915”(physical association)0.560
NOTCH2NLCLRFN4psi-mi:“MI:0915”(physical association)0.560
KRTAP6-2LRFN4psi-mi:“MI:0915”(physical association)0.560
P4HBLRFN4psi-mi:“MI:0915”(physical association)0.560
CYSRT1LRFN4psi-mi:“MI:0915”(physical association)0.560
LRFN4PTPRDpsi-mi:“MI:0915”(physical association)0.540
LRFN4PTPRSpsi-mi:“MI:0915”(physical association)0.540
LRFN4PTPRFpsi-mi:“MI:0915”(physical association)0.540

BioGRID (98): NOTCH2NL (Two-hybrid), SPECC1L (Affinity Capture-MS), MYO18A (Affinity Capture-MS), AP2A1 (Affinity Capture-MS), AP2A2 (Affinity Capture-MS), AP1B1 (Affinity Capture-MS), FBXO46 (Affinity Capture-MS), REPS1 (Affinity Capture-MS), LRFN4 (Affinity Capture-MS), LRFN4 (Affinity Capture-MS), NCK2 (Affinity Capture-MS), DYNLL1 (Affinity Capture-MS), NCK1 (Affinity Capture-MS), LGALS1 (Affinity Capture-MS), LRFN4 (Affinity Capture-MS)

ESM2 similar proteins: A2A9Q0, A5PKD8, B0BNK7, D2HFT7, D4ABX8, E9Q7T7, O75325, O94819, P0C7J6, P0DKB5, Q04785, Q13641, Q1RMS4, Q24JP5, Q28730, Q2I0M4, Q2WF71, Q460M5, Q4R8Y9, Q50LG9, Q5PQV5, Q6NUI6, Q6PJG9, Q6UKI2, Q7M6Z0, Q80TG9, Q80W15, Q80WD1, Q80XU8, Q86UN3, Q86WK7, Q8BHA1, Q8BLY3, Q8BNW9, Q8C013, Q8WX77, Q96PE1, Q9BE71, Q9BTN0, Q9BY71

Diamond homologs: A0A1Y9G8H0, A0A452E9Y6, A1KZ92, A2A8L5, A2AJ76, A4IFW2, A4IGL7, A4IIW9, A5JUY8, A7MBJ4, A8WGA3, A8WQH2, B0BNK7, B3A0P3, D2HFT7, D3YXG0, D4A1J9, D4ABX8, G5EBF1, G5EG78, H2A0M7, O15146, O35158, O55005, O89026, P05164, P07202, P09933, P0C6S8, P0C7J6, P11247, P11678, P14650, P16621, P22079, P23468, P35419, P49290, P70193, P80025

SIGNOR signaling

3 interactions.

AEffectBMechanism
LRFN4up-regulatesSynaptic_plasticity
LRFN4“up-regulates activity”DLG4binding
LRFN4up-regulatesNeurite_outgrowth

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 66 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
response to endoplasmic reticulum stress514.9×8e-03

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic3
Likely pathogenic0
Uncertain significance101
Likely benign4
Benign0

Top pathogenic / likely-pathogenic (3)

Variant IDHGVSClassification
1030920NM_001040716.2(PC):c.1368+3605C>APathogenic
1457685NC_000011.9:g.(?66618135)(66639640_?)delPathogenic
3896256NC_000011.9:g.(66616842_66617081)_(66639631_66719900)delPathogenic

SpliceAI

298 predictions. Top by Δscore:

VariantEffectΔscore
11:66859636:GGATT:Gacceptor_gain1.0000
11:66859094:G:GAdonor_loss0.9900
11:66859095:T:Gdonor_loss0.9900
11:66859099:G:GTdonor_gain0.9900
11:66859633:GCAG:Gacceptor_loss0.9900
11:66859635:A:AGacceptor_gain0.9900
11:66859635:A:Cacceptor_loss0.9900
11:66859635:AG:Aacceptor_gain0.9900
11:66859636:G:GGacceptor_gain0.9900
11:66859636:GG:Gacceptor_gain0.9900
11:66859075:A:Gdonor_gain0.9800
11:66859094:G:GGdonor_gain0.9800
11:66859636:GGA:Gacceptor_gain0.9800
11:66859096:G:GGdonor_loss0.9700
11:66859636:GGAT:Gacceptor_gain0.9600
11:66859634:CAGGA:Cacceptor_gain0.9500
11:66859632:TGCAG:Tacceptor_gain0.9200
11:66859633:GCAGG:Gacceptor_gain0.9200
11:66859635:AGGAT:Aacceptor_gain0.9200
11:66859100:A:Gdonor_gain0.9100
11:66856716:C:CAdonor_gain0.8800
11:66859632:T:TAacceptor_gain0.8500
11:66859636:G:Tacceptor_gain0.8500
11:66859097:A:ACdonor_loss0.7800
11:66859509:C:CGdonor_gain0.7800
11:66857082:G:Adonor_gain0.7700
11:66859631:CTGCA:Cacceptor_gain0.7600
11:66859311:TCCC:Tdonor_gain0.7500
11:66859663:T:TAdonor_gain0.7500
11:66858219:C:Tdonor_gain0.7400

AlphaMissense

4004 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
11:66857902:T:CL53P1.000
11:66857918:C:AN58K1.000
11:66857918:C:GN58K1.000
11:66857974:T:CL77P1.000
11:66857989:A:TN82I1.000
11:66857990:T:AN82K1.000
11:66857990:T:GN82K1.000
11:66858684:T:AW314R1.000
11:66858684:T:CW314R1.000
11:66858686:G:CW314C1.000
11:66858686:G:TW314C1.000
11:66858809:C:AN355K1.000
11:66858809:C:GN355K1.000
11:66857917:A:TN58I0.999
11:66857947:T:CF68S0.999
11:66857947:T:GF68C0.999
11:66857988:A:TN82Y0.999
11:66858046:T:AL101H0.999
11:66858046:T:CL101P0.999
11:66858052:T:CL103P0.999
11:66858061:A:TN106I0.999
11:66858062:C:AN106K0.999
11:66858062:C:GN106K0.999
11:66858118:T:CL125P0.999
11:66858193:T:CL150P0.999
11:66858199:T:CL152P0.999
11:66858208:A:TN155I0.999
11:66858209:C:AN155K0.999
11:66858209:C:GN155K0.999
11:66858279:A:TN179Y0.999

dbSNP variants (sampled 300 via entrez): RS1000108299 (11:66855711 A>G), RS1000607687 (11:66859224 C>A,G), RS1001442385 (11:66856405 G>A,T), RS1001580764 (11:66856239 G>A), RS1002069642 (11:66859460 C>T), RS1002348780 (11:66860437 C>T), RS1002591167 (11:66856249 C>A), RS1002723359 (11:66856091 G>A,C), RS1002849907 (11:66857125 C>T), RS1003520205 (11:66857320 G>A,C), RS1004020266 (11:66857405 G>A,C), RS1004504517 (11:66859871 T>C), RS1004972521 (11:66858775 G>A), RS1005176822 (11:66860725 C>G,T), RS1005700699 (11:66858732 G>C)

Disease associations

OMIM: gene MIM:612810 | disease phenotypes: MIM:266150

GenCC curated gene-disease

Mondo (1): pyruvate carboxylase deficiency disease (MONDO:0009949)

Orphanet (1): Pyruvate carboxylase deficiency (Orphanet:3008)

HPO phenotypes

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

GWAS associations

3 associations (top):

StudyTraitp-value
GCST001241_12Bipolar disorder2.000000e-07
GCST007324_130Adventurousness8.000000e-10
GCST008103_30Bipolar disorder4.000000e-08

EFO canonical traits (1, from GWAS)

EFO IDTrait name
EFO:0008579risk-taking behaviour

MeSH disease descriptors (1)

DescriptorNameTree numbers
D015324Pyruvate Carboxylase Deficiency DiseaseC10.228.140.163.100.725; C16.320.565.189.725; C16.320.565.202.810.666; C18.452.132.100.725; C18.452.648.189.725; C18.452.648.202.810.666; C18.452.660.705

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

24 total (human), top 24 by PubMed support.

ChemicalActions (top 5)PubMed papers
(+)-JQ1 compounddecreases expression2
aristolochic acid Iincreases expression1
FR900359decreases phosphorylation1
trichostatin Aaffects expression1
sodium arsenitedecreases expression1
cupric chlorideincreases expression1
di-n-butylphosphoric acidaffects expression1
abrinedecreases expression1
jinfukangincreases expression1
MT19c compounddecreases expression1
4-(4-((5-(4,5-dimethyl-2-nitrophenyl)-2-furanyl)methylene)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzoic aciddecreases expression1
Bortezomibdecreases expression1
Temozolomidedecreases expression1
Air Pollutantsdecreases expression, increases abundance1
Benzo(a)pyreneincreases expression1
Doxorubicindecreases expression1
Estradiolincreases expression1
Hydrogen Peroxideaffects expression1
Tretinoindecreases expression1
Valproic Aciddecreases expression, increases methylation1
7,8-Dihydro-7,8-dihydroxybenzo(a)pyrene 9,10-oxidedecreases expression1
Cyclosporineincreases expression1
Aflatoxin B1increases methylation1
Particulate Matterdecreases expression, increases abundance1

Clinical trials (associated diseases)

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

TrialPhaseStatusTitle
NCT01461304Not specifiedNO_LONGER_AVAILABLECompassionate Use of Triheptanoin (C7) for Inherited Disorders of Energy Metabolism
  • Disease cohort memberships (association, not causation — diseases whose associated-gene cohort lists this gene; a subset are also under Associated diseases): pyruvate carboxylase deficiency disease