FBN3

gene
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Also known as KIAA1776

Summary

FBN3 (fibrillin 3, HGNC:18794) is a protein-coding gene on chromosome 19p13.2, encoding Fibrillin-3 (Q75N90). Fibrillins are structural components of 10-12 nm extracellular calcium-binding microfibrils, which occur either in association with elastin or in elastin-free bundles.

This gene encodes a memebr of the fibrillin protein family. Fibrillins are extracellular matrix molecules that assemble into microfibrils in many connective tissues. This gene is most highly expressed in fetal tissues and its protein product is localized to extracellular microfibrils of developing skeletal elements, skin, lung, kidney, and skeletal muscle. This gene is potentially involved in Weill-Marchesani syndrome.

Source: NCBI Gene 84467 — RefSeq curated summary.

At a glance

  • GWAS associations: 11
  • Clinical variants (ClinVar): 1,691 total
  • MANE Select transcript: NM_032447

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:18794
Approved symbolFBN3
Namefibrillin 3
Location19p13.2
Locus typegene with protein product
StatusApproved
AliasesKIAA1776
Ensembl geneENSG00000142449
Ensembl biotypeprotein_coding
OMIM608529
Entrez84467

Gene structure

Transcript identifiers

Ensembl transcripts: 11 — 8 protein_coding, 3 retained_intron

ENST00000270509, ENST00000594331, ENST00000595036, ENST00000598269, ENST00000600128, ENST00000601281, ENST00000601739, ENST00000602121, ENST00000651877, ENST00000924671, ENST00000924672

RefSeq mRNA: 2 — MANE Select: NM_032447 NM_001321431, NM_032447

CCDS: CCDS12196

Canonical transcript exons

ENST00000600128 — 64 exons

ExonStartEnd
ENSE0000115487980832478083372
ENSE0000115489880862008086325
ENSE0000127306480720488072198
ENSE0000127307280730638073297
ENSE0000127307880750718075190
ENSE0000127308780752838075411
ENSE0000127309480810038081119
ENSE0000127310380813588081480
ENSE0000127311680853638085569
ENSE0000127313480870778087211
ENSE0000127317380898948089959
ENSE0000159970181458438145938
ENSE0000160461581315548131829
ENSE0000160643681081708108238
ENSE0000161236981096318109753
ENSE0000161422981237848124008
ENSE0000161921681359618136086
ENSE0000162340780964448096569
ENSE0000162551181174648117589
ENSE0000162596880972898097414
ENSE0000163174481461278146225
ENSE0000163330180968818097006
ENSE0000163402381267138126832
ENSE0000163454081119778112099
ENSE0000163566281155158115640
ENSE0000163995581212588121386
ENSE0000164895981027248102873
ENSE0000164960481188978119022
ENSE0000165886780914658091590
ENSE0000166323780953758095503
ENSE0000167406480944468094565
ENSE0000167879781258928126017
ENSE0000170065381448778144972
ENSE0000171165381166748116799
ENSE0000171359281329848133106
ENSE0000171686981234648123589
ENSE0000172241681290288129153
ENSE0000172610981171698117291
ENSE0000172892381009018100972
ENSE0000173404181384128138564
ENSE0000173559481061088106233
ENSE0000173773681264688126605
ENSE0000174292081108458110967
ENSE0000174387381262978126347
ENSE0000175101881092278109388
ENSE0000175222581419408142137
ENSE0000175371780900998090251
ENSE0000176036181417178141842
ENSE0000176391381381418138323
ENSE0000176649981035628103687
ENSE0000177776381361908136309
ENSE0000178076680959648096080
ENSE0000178796781363888136531
ENSE0000179067181116488111770
ENSE0000179139581292408129365
ENSE0000179764881471048147186
ENSE0000180200081312358131288
ENSE0000307532581494498149592
ENSE0000309901780654028066260
ENSE0000311632881473148147497
ENSE0000350711980895458089670
ENSE0000354532780878258087947
ENSE0000365106181110588111183
ENSE0000368420880880608088179

Expression profiles

Bgee: expression breadth ubiquitous, 131 present calls, max score 94.50.

FANTOM5 (CAGE): breadth tissue_specific, TPM avg 0.4336 / max 19.5608, expressed in 158 samples.

FANTOM5 promoters (2 alternative TSS)

Promoter IDTPM avgSamples expressed
1789300.2614131
1789310.172294

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
cortical plateUBERON:000534394.50gold quality
embryoUBERON:000092288.48gold quality
ganglionic eminenceUBERON:000402388.48gold quality
skeletal muscle tissue of rectus abdominisUBERON:000451179.83gold quality
ventricular zoneUBERON:000305379.54gold quality
upper arm skinUBERON:000426374.93gold quality
secondary oocyteCL:000065574.14silver quality
vena cavaUBERON:000408773.98silver quality
myocardiumUBERON:000234973.94gold quality
nasal cavity epitheliumUBERON:000538472.80gold quality
cerebellar vermisUBERON:000472071.83gold quality
kidney epitheliumUBERON:000481971.66gold quality
parotid glandUBERON:000183170.35gold quality
metanephrosUBERON:000008169.76gold quality
saliva-secreting glandUBERON:000104469.70gold quality
metanephros cortexUBERON:001053369.39gold quality
minor salivary glandUBERON:000183069.36gold quality
mouth mucosaUBERON:000372968.76gold quality
cortex of kidneyUBERON:000122567.94gold quality
ponsUBERON:000098867.84gold quality
body of tongueUBERON:001187667.68gold quality
buccal mucosa cellCL:000233667.48gold quality
left lobe of thyroid glandUBERON:000112067.34gold quality
cartilage tissueUBERON:000241867.29gold quality
thyroid glandUBERON:000204667.26gold quality
gingival epitheliumUBERON:000194967.22gold quality
heart right ventricleUBERON:000208066.97gold quality
inferior vagus X ganglionUBERON:000536366.87gold quality
pylorusUBERON:000116666.85gold quality
skeletal muscle tissue of biceps brachiiUBERON:000450266.85gold quality

Single-cell (SCXA)

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

ExperimentMarker?Max mean expression
E-ANND-3yes5.54

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

15 targeting FBN3, 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-515-5P99.9269.822343
HSA-MIR-519E-5P99.9269.622358
HSA-MIR-548E-5P99.8972.734486
HSA-MIR-120099.7170.421838
HSA-MIR-377-5P99.7065.28712
HSA-MIR-608699.7065.38699
HSA-MIR-378A-5P99.6566.331311
HSA-MIR-7109-5P99.1866.131057
HSA-MIR-328-5P99.0864.651000
HSA-MIR-143-5P98.9868.87946
HSA-MIR-6885-5P98.7164.33902
HSA-MIR-4700-5P98.6367.431915
HSA-MIR-6887-5P98.5668.491295
HSA-MIR-6795-5P98.5268.511277
HSA-MIR-443595.9065.471201

Literature-anchored findings (GeneRIF, showing 11)

  • fibrillin-3 gene showed the strongest evidence for association with Polycystic ovary syndrome (PMID:17785364)
  • Data show that fibrillin 3 appears to have little involvement in PCOS but cannot rule out that other markers in the region of chromosome 19p13.2 are associated with PCOS or that FBN3 expression occurs in other organs that may influence the PCOS phenotype. (PMID:19692420)
  • Single nucleotide polymorphisms in FBN3 occur and may be a candidate gene for polycystic ovary syndrome. (PMID:20200332)
  • A variant in the fibrillin-3 gene is associated with TGF-beta and inhibin B levels in women with polycystic ovary syndrome. (PMID:20630504)
  • Loss of fibrillin-3 during folliculogenesis may be an important factor in polycystic ovary syndrome pathogenesis. (PMID:20855553)
  • fibrillin-3, compared to the other fibrillins, fulfills both overlapping and distinct functions in human development (PMID:20970500)
  • Data show that TGF-beta pathways operate during ovarian fetal development, and fibrillin 3 is highly expressed at a critical stage early in developing human and bovine fetal ovaries. (PMID:21411746)
  • The FBN3 risk allele may be associated with changes in basal glucose homeostasis in PCOS. (PMID:22301903)
  • an association study showed a potential association of the D19S884 marker with PCOS in Chinese Han women and the meta-analysis identified that the A8 allele may increase susceptibility to PCOS (PMID:23265956)
  • Further delineation of familial polycystic ovary syndrome (PCOS) via whole-exome sequencing: PCOS-related rare FBN3 and FN1 gene variants are identified. (PMID:35141985)
  • Genetic Insights into Skeletal Malocclusion: The Role of the FBN3 rs7351083 SNP in the Romanian Population. (PMID:39064490)

Cross-species orthologs

1 orthologs

OrganismSymbolGene ID
danio_reriofbn2bENSDARG00000098237

Paralogs (2): FBN2 (ENSG00000138829), FBN1 (ENSG00000166147)

Protein

Protein identifiers

Fibrillin-3Q75N90 (reviewed: Q75N90)

All UniProt accessions (4): Q75N90, A0A494C0D8, M0QXL8, M0R2Q5

UniProt curated annotations — full annotation on UniProt →

Function. Fibrillins are structural components of 10-12 nm extracellular calcium-binding microfibrils, which occur either in association with elastin or in elastin-free bundles. Fibrillin-containing microfibrils provide long-term force bearing structural support.

Subcellular location. Secreted. Extracellular space. Extracellular matrix.

Tissue specificity. Predominantly expressed in connective tissues such as skeletal muscle, tendon, skin, perichondrium and periosteum. Highly expressed in fetal lung, brain, kidney. Expressed at low level in prostate, testis, mammary gland, uterus, ovary, placenta, bladder, adrenal gland, thyroid, fetal thymus, fetal liver, liver, fetal heart and heart.

Post-translational modifications. Probably forms intermolecular disulfide bonds either with other FBN3 molecules or with other components of the microfibrils.

Similarity. Belongs to the fibrillin family.

RefSeq proteins (2): NP_001308360, NP_115823* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR000152EGF-type_Asp/Asn_hydroxyl_sitePTM
IPR000742EGFDomain
IPR001881EGF-like_Ca-bd_domDomain
IPR009030Growth_fac_rcpt_cys_sfHomologous_superfamily
IPR013032EGF-like_CSConserved_site
IPR017878TB_domDomain
IPR018097EGF_Ca-bd_CSConserved_site
IPR024731NELL2-like_EGFDomain
IPR026823cEGFDomain
IPR036773TB_dom_sfHomologous_superfamily
IPR040872Fibrillin_U_NDomain
IPR049388FBN_EGF_NDomain
IPR049883NOTCH1_EGF-likeDomain
IPR052080vWF_C/EGF_FibrillinFamily

Pfam: PF00683, PF07645, PF12661, PF12662, PF12947, PF18193, PF21364

UniProt features (229 total): disulfide bond 132, domain 53, sequence variant 30, glycosylation site 10, chain 2, signal peptide 1, propeptide 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

No AlphaFold model available for Q75N90 — AlphaFold DB does not currently provide models for proteins above ~3000 aa.

Functional residue map

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

Disulfide bonds (132): 990–1002, 997–1011, 1013–1026, 1032–1044, 1039–1053, 1055–1069, 1075–1087, 1082–1096, 1098–1111, 1117–1129, 1124–1138, 1140–1153, 1159–1170, 1166–1179, 1181–1194, 1200–1212, 1207–1221, 1223–1236, 1242–1254, 1249–1263 …

Glycosylation sites (10): 406, 1025, 1442, 1538, 1627, 1658, 1668, 1858, 2033, 2713

Function

Pathways and Gene Ontology

Reactome pathways

3 pathways

IDPathway
R-HSA-1474228Degradation of the extracellular matrix
R-HSA-1566948Elastic fibre formation
R-HSA-2129379Molecules associated with elastic fibres

MSigDB gene sets: 77 (showing top): MODULE_511, GOBP_ANIMAL_ORGAN_MORPHOGENESIS, GOBP_EMBRYONIC_ORGAN_MORPHOGENESIS, GOMF_EXTRACELLULAR_MATRIX_STRUCTURAL_CONSTITUENT, GOBP_CARBOHYDRATE_METABOLIC_PROCESS, GOBP_GLUCOSE_METABOLIC_PROCESS, GOBP_CARBOHYDRATE_HOMEOSTASIS, MODULE_544, DOUGLAS_BMI1_TARGETS_UP, GOBP_EMBRYO_DEVELOPMENT, GOBP_EMBRYONIC_EYE_MORPHOGENESIS, GOBP_SENSORY_ORGAN_DEVELOPMENT, GOBP_SENSORY_ORGAN_MORPHOGENESIS, GOBP_MONOSACCHARIDE_METABOLIC_PROCESS, GOMF_SIGNALING_RECEPTOR_BINDING

GO Biological Process (5): glucose metabolic process (GO:0006006), glucose homeostasis (GO:0042593), camera-type eye development (GO:0043010), embryonic eye morphogenesis (GO:0048048), signal transduction (GO:0007165)

GO Molecular Function (4): hormone activity (GO:0005179), extracellular matrix structural constituent (GO:0005201), calcium ion binding (GO:0005509), extracellular matrix constituent conferring elasticity (GO:0030023)

GO Cellular Component (3): microfibril (GO:0001527), extracellular region (GO:0005576), extracellular matrix (GO:0031012)

Reactome top-level categories

Rollup of top-2 pathways:

CategoryPathways
Extracellular matrix organization2
Elastic fibre formation1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
hexose metabolic process1
carbohydrate homeostasis1
eye development1
embryonic organ morphogenesis1
eye morphogenesis1
cell communication1
cellular process1
signaling1
regulation of cellular process1
cellular response to stimulus1
receptor ligand activity1
structural molecule activity1
extracellular matrix1
metal ion binding1
extracellular matrix structural constituent1
structural molecule activity conferring elasticity1
elastic fiber1
supramolecular fiber1
cellular anatomical structure1
external encapsulating structure1

Protein interactions and networks

STRING

1575 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
FBN3CCL25O15444698
FBN3CAPN10Q9HC96690
FBN3SRD5A1P18405672
FBN3SULT2A1Q06520649
FBN3DENND1AQ8TEH3624
FBN3INSRP06213596
FBN3H6PDO95479582
FBN3SRD5A2P31213573
FBN3KRR1Q13601571
FBN3FSTP19883570
FBN3CYP11A1P05108547
FBN3CYP17A1P05093538
FBN3SUOXP51687525
FBN3BBS10Q8TAM1523
FBN3HSD11B1P28845507

IntAct

16 interactions, top by confidence:

ABTypeScore
FN1FBN3psi-mi:“MI:0407”(direct interaction)0.440
FBN3ANXA7psi-mi:“MI:0915”(physical association)0.370
FBN3BIDpsi-mi:“MI:0915”(physical association)0.370
SMAPFBN3psi-mi:“MI:0915”(physical association)0.370
FBN3CDKN1Apsi-mi:“MI:0915”(physical association)0.370
FBN3DAZAP2psi-mi:“MI:0915”(physical association)0.370
FBN3GADD45Apsi-mi:“MI:0915”(physical association)0.370
GSK3BFBN3psi-mi:“MI:0915”(physical association)0.370
NUDT21FBN3psi-mi:“MI:0915”(physical association)0.370
FBN3PIK3R3psi-mi:“MI:0915”(physical association)0.370
RPN2FBN3psi-mi:“MI:0915”(physical association)0.370
RPS6KA6FBN3psi-mi:“MI:0915”(physical association)0.370
FBN3TK1psi-mi:“MI:0915”(physical association)0.370
TSC22D1FBN3psi-mi:“MI:0915”(physical association)0.370
FBN3psi-mi:“MI:0915”(physical association)0.370

BioGRID (16): FBN3 (Affinity Capture-MS), FBN3 (Affinity Capture-MS), FBN3 (Cross-Linking-MS (XL-MS)), FBN3 (Two-hybrid), FBN3 (Two-hybrid), FBN3 (Two-hybrid), FBN3 (Two-hybrid), FBN3 (Two-hybrid), FBN3 (Two-hybrid), FBN3 (Two-hybrid), FBN3 (Two-hybrid), FBN3 (Two-hybrid), FBN3 (Two-hybrid), FBN3 (Two-hybrid), FBN3 (Two-hybrid)

ESM2 similar proteins: A0A0R4IKU3, A1A5Y0, A2ASQ1, A2VCU8, A6QR11, O42182, O55225, P01130, P01131, P01132, P01133, P07522, P20063, P25304, P31696, P35950, P35951, P35952, P97607, Q00968, Q14393, Q28832, Q501P1, Q53RD9, Q5R3Z7, Q61220, Q61592, Q62918, Q62919, Q63772, Q66PY1, Q6ZRI0, Q75N90, Q7T3Q2, Q7ZXL5, Q8AWW5, Q8CJ69, Q8IX30, Q8N8U9, Q8R4Y4

Diamond homologs: A0A1U9VX91, A2AJ76, O08999, O43897, O57382, O57460, O75095, P13497, P35556, P98063, P98070, P98133, Q00918, Q14766, Q61555, Q62381, Q75N90, Q7KVA1, Q8C088, Q8CG19, Q8JI28, Q9DER7, Q9TV36, A1A5Y0, A2VCU8, A4IGL7, A5A8Y8, A6QR11, B5DFC9, O88322, P07996, P10493, P14585, P35441, P35448, P82279, P98118, Q14112, Q20911, Q24025

SIGNOR signaling

0 interactions.

Disease & clinical

Clinical variants and AI predictions

ClinVar

1691 variants total. Per-class counts are floors (≥ shown; pagination cap):

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance930
Likely benign485
Benign164

Top pathogenic / likely-pathogenic (0)

SpliceAI

9896 predictions. Top by Δscore:

VariantEffectΔscore
19:8068767:C:Adonor_gain1.0000
19:8085502:A:ACdonor_gain1.0000
19:8085503:C:CCdonor_gain1.0000
19:8086195:CTCA:Cdonor_loss1.0000
19:8086196:TCACC:Tdonor_loss1.0000
19:8086197:CAC:Cdonor_loss1.0000
19:8086197:CACC:Cdonor_loss1.0000
19:8086198:ACCGT:Adonor_loss1.0000
19:8086199:C:Tdonor_loss1.0000
19:8086325:TCTGA:Tacceptor_loss1.0000
19:8086326:CTGAG:Cacceptor_loss1.0000
19:8087209:CAT:Cacceptor_gain1.0000
19:8087212:C:CCacceptor_gain1.0000
19:8087215:C:CTacceptor_gain1.0000
19:8087218:A:ACacceptor_gain1.0000
19:8087223:C:CTacceptor_gain1.0000
19:8089544:CCCA:Cdonor_gain1.0000
19:8089668:CGT:Cacceptor_gain1.0000
19:8089671:C:CCacceptor_gain1.0000
19:8089957:CAG:Cacceptor_gain1.0000
19:8089960:C:CCacceptor_gain1.0000
19:8091459:ACTT:Adonor_loss1.0000
19:8091460:CTTA:Cdonor_loss1.0000
19:8091461:TTA:Tdonor_loss1.0000
19:8091461:TTAC:Tdonor_loss1.0000
19:8091462:TA:Tdonor_loss1.0000
19:8091463:A:ACdonor_gain1.0000
19:8091463:A:Cdonor_loss1.0000
19:8091463:ACCAA:Adonor_loss1.0000
19:8091464:C:CAdonor_loss1.0000

AlphaMissense

0 scored. Top likely-pathogenic:

dbSNP variants (sampled 300 via entrez): RS1000010403 (19:8068176 G>A), RS1000077154 (19:8146435 G>A), RS1000105578 (19:8135209 C>A,G,T), RS1000108382 (19:8099237 A>G), RS1000127667 (19:8110587 C>A), RS1000158641 (19:8110318 C>G), RS1000227751 (19:8068048 G>A,C), RS1000278431 (19:8140396 G>A), RS1000319399 (19:8081196 C>T), RS1000332045 (19:8151119 G>A,C), RS1000357719 (19:8116124 G>A,C), RS1000436036 (19:8072837 G>C), RS1000447647 (19:8085645 G>C,T), RS1000464960 (19:8106023 C>G,T), RS1000502179 (19:8090938 G>T)

Disease associations

OMIM: gene MIM:608529 | disease phenotypes: MIM:277600, MIM:109730

GenCC curated gene-disease

Mondo (2): Weill-Marchesani syndrome (MONDO:0018096), aortic valve disease 1 (MONDO:0024523)

Orphanet (1): Weill-Marchesani syndrome (Orphanet:3449)

HPO phenotypes

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

GWAS associations

11 associations (top):

StudyTraitp-value
GCST004406_2Neurocognitive impairment in HIV-1 infection (continuous)4.000000e-07
GCST005650_173Serum metabolite ratios in chronic kidney disease3.000000e-13
GCST006916_9Attention deficit hyperactivity disorder2.000000e-06
GCST008758_77Pre-treatment viral load in HIV-1 infection2.000000e-19
GCST010002_147Refractive error4.000000e-16
GCST012020_52Serum metabolite levels9.000000e-27
GCST012020_531Serum metabolite levels3.000000e-11
GCST012020_532Serum metabolite levels2.000000e-18
GCST012020_533Serum metabolite levels3.000000e-12
GCST012251_3Macular telangiectasia type 23.000000e-07
GCST012252_10Macular telangiectasia type 23.000000e-08

EFO canonical traits (3, from GWAS)

EFO IDTrait name
EFO:0007998cognitive impairment measurement
EFO:0010125viral load
EFO:1002009macular telangiectasia type 2

MeSH disease descriptors (1)

DescriptorNameTree numbers
D056846Weill-Marchesani SyndromeC05.116.099.343.957; C11.270.921; C16.131.077.941; C16.320.290.842; C17.300.899

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

28 total (human), top 28 by PubMed support.

ChemicalActions (top 5)PubMed papers
Valproic Aciddecreases expression, affects expression, affects cotreatment5
bisphenol Adecreases expression, decreases methylation2
Phenylmercuric Acetatedecreases expression, affects cotreatment2
2,4,6-tribromophenoldecreases expression1
methylmercuric chloridedecreases expression1
decabromobiphenyl etherdecreases expression1
tetrabromobisphenol Adecreases expression1
perfluorooctanoic acidaffects cotreatment, decreases expression1
benzo(e)pyreneincreases methylation1
aflatoxin B2affects methylation1
perfluorooctane sulfonic acidaffects cotreatment, decreases expression1
4-(5-benzo(1,3)dioxol-5-yl-4-pyridin-2-yl-1H-imidazol-2-yl)benzamidedecreases expression, affects cotreatment1
perfluorohexanesulfonic acidaffects cotreatment, decreases expression1
belinostatdecreases expression1
2,2’,4,4’-tetrabromodiphenyl etherdecreases expression1
dorsomorphinaffects cotreatment, decreases expression1
pentabrominated diphenyl ether 100decreases expression1
hexabrominated diphenyl ether 153decreases expression1
bisphenol Sdecreases methylation1
Vorinostatdecreases expression1
Arsenicdecreases expression1
Benzo(a)pyreneaffects methylation1
Diazinonincreases methylation1
Methapyrileneincreases methylation1
Tobacco Smoke Pollutiondecreases expression1
Aflatoxin B1affects methylation1
Acrylamidedecreases expression1
S-Nitrosoglutathioneincreases expression1

Clinical trials (associated diseases)

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