KRT86

gene
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Also known as MNXHb6

Summary

KRT86 (keratin 86, HGNC:6463) is a protein-coding gene on chromosome 12q13, encoding Keratin, type II cuticular Hb6 (O43790).

This gene encodes a type II keratin protein, which heterodimerizes with type I keratins to form hair and nails. This gene is present in a cluster of related genes and pseudogenes on chromosome 12. Mutations in this gene have been observed in patients with the hair disease monilethrix.

Source: NCBI Gene 3892 — RefSeq curated summary.

At a glance

  • Gene–disease (curated): monilethrix (Strong, GenCC) — +1 more curated relationship
  • GWAS associations: 4
  • Clinical variants (ClinVar): 163 total — 5 pathogenic, 1 likely-pathogenic
  • Phenotypes (HPO): 23
  • Druggable target: yes
  • MANE Select transcript: NM_001320198

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:6463
Approved symbolKRT86
Namekeratin 86
Location12q13
Locus typegene with protein product
StatusApproved
AliasesMNX, Hb6
Ensembl geneENSG00000170442
Ensembl biotypeprotein_coding
OMIM601928
Entrez3892

Gene structure

Transcript identifiers

Ensembl transcripts: 4 — 4 protein_coding

ENST00000293525, ENST00000423955, ENST00000553310, ENST00000958042

RefSeq mRNA: 1 — MANE Select: NM_001320198 NM_001320198

CCDS: CCDS41785

Canonical transcript exons

ENST00000423955 — 11 exons

ExonStartEnd
ENSE000011928215230840452309163
ENSE000032581835227582152275946
ENSE000032914275230310052303308
ENSE000032993865227464552274722
ENSE000033240405230493252305027
ENSE000033808865230411152304171
ENSE000033909865230524052305404
ENSE000033965905230566352305788
ENSE000034016805230823352308264
ENSE000034131015230606052306280
ENSE000037022255230191352302285

Expression profiles

Bgee: expression breadth ubiquitous, 160 present calls, max score 93.03.

FANTOM5 (CAGE): breadth broad, TPM avg 0.5886 / max 74.6373, expressed in 204 samples.

FANTOM5 promoters (5 alternative TSS)

Promoter IDTPM avgSamples expressed
1256090.3031162
1256100.164098
1256150.08296
1256110.01948
1256120.01915

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
male germ line stem cell (sensu Vertebrata) in testisCL:0000089 ∩ UBERON:000047393.03gold quality
spermCL:000001984.91silver quality
right coronary arteryUBERON:000162582.14gold quality
male germ cellCL:000001581.96silver quality
upper arm skinUBERON:000426379.65silver quality
buccal mucosa cellCL:000233676.00silver quality
hair follicleUBERON:000207374.10silver quality
endometrium epitheliumUBERON:000481172.89gold quality
coronary arteryUBERON:000162170.34gold quality
ascending aortaUBERON:000149670.05gold quality
amniotic fluidUBERON:000017370.04gold quality
left coronary arteryUBERON:000162669.96gold quality
thoracic aortaUBERON:000151569.71gold quality
tibialis anteriorUBERON:000138569.46silver quality
pancreatic ductal cellCL:000207969.09silver quality
deciduaUBERON:000245068.12silver quality
left lobe of thyroid glandUBERON:000112065.97gold quality
thyroid glandUBERON:000204665.71gold quality
placentaUBERON:000198765.13gold quality
body of pancreasUBERON:000115064.79gold quality
right lobe of thyroid glandUBERON:000111964.42gold quality
aortaUBERON:000094764.35gold quality
secondary oocyteCL:000065563.29gold quality
minor salivary glandUBERON:000183063.29gold quality
deltoidUBERON:000147662.99silver quality
C1 segment of cervical spinal cordUBERON:000646962.96gold quality
saliva-secreting glandUBERON:000104462.93gold quality
descending thoracic aortaUBERON:000234562.87gold quality
left testisUBERON:000453362.36gold quality
spinal cordUBERON:000224062.11gold quality

Single-cell (SCXA)

Detected in 6 experiment(s), a significant marker in 5.

ExperimentMarker?Max mean expression
E-GEOD-70580yes916.28
E-MTAB-6678yes651.33
E-MTAB-6701yes95.04
E-CURD-46yes15.93
E-CURD-122yes10.16
E-ANND-3no1.71

Regulation

Is transcription factor: no

Literature-anchored findings (GeneRIF, showing 10)

  • The KRTHB6 expression uniformly occurred in the midcortex region. (PMID:15797458)
  • The results emphasized the key role of hair keratin hHB6 in the pathogenesis of monilethrix and indicated that the common mutation of hHB6 was also a cause of monilethrix in Chinese. (PMID:18393232)
  • Mutation E402K of the hHb6 in a Chinese Han family with monilethrix. (PMID:19505862)
  • Congenital monilethrix and hereditary unilateral external auditory canal atresia are co-inherited in a Chinese pedigree with recurrent KRT86 mutation. (PMID:22568869)
  • Results idntify a novel mutation of krt86 protein causing monilethrix located in a region other than the helix. (PMID:22670615)
  • The mutation of extron 7 of KRT86 identified plays a major role in the pathogenesis of this pedigree with monilethrix. (PMID:23981620)
  • Novel mutations causing monilethrix are reported in KRT81, KRT83, and KRT86. (PMID:25557232)
  • Analysis of KRT86 revealed a novel mutation, c.1231G>T;p.Glu411*, in exon 7 in the three affected children and their mother with monilethrix. (PMID:25809918)
  • Study reported here a three-generation Chinese family with autosomal dominant monilethrix carrying a novel missense mutation c.1223G>C in KRT86. (PMID:29701253)
  • Autosomal dominant monilethrix with incomplete penetrance due to a novel KRT86 mutation in a Chinese family. (PMID:38594178)

Cross-species orthologs

0 orthologs

Paralogs (68): KRT33A (ENSG00000006059), VIM (ENSG00000026025), KRT31 (ENSG00000094796), NEFM (ENSG00000104722), KRT23 (ENSG00000108244), KRT37 (ENSG00000108417), KRT32 (ENSG00000108759), KRT18 (ENSG00000111057), LMNB1 (ENSG00000113368), KRT36 (ENSG00000126337), KRT17 (ENSG00000128422), GFAP (ENSG00000131095), KRT34 (ENSG00000131737), KRT33B (ENSG00000131738), NES (ENSG00000132688), PRPH (ENSG00000135406), KRT85 (ENSG00000135443), KRT7 (ENSG00000135480), KRT71 (ENSG00000139648), INA (ENSG00000148798), LMNTD1 (ENSG00000152936), LMNA (ENSG00000160789), KRT84 (ENSG00000161849), KRT82 (ENSG00000161850), KRT80 (ENSG00000167767), KRT1 (ENSG00000167768), KRT24 (ENSG00000167916), KRT8 (ENSG00000170421), KRT78 (ENSG00000170423), KRT75 (ENSG00000170454), KRT6C (ENSG00000170465), KRT4 (ENSG00000170477), KRT74 (ENSG00000170484), KRT72 (ENSG00000170486), KRT83 (ENSG00000170523), BFSP2 (ENSG00000170819), KRT19 (ENSG00000171345), KRT15 (ENSG00000171346), KRT38 (ENSG00000171360), KRT13 (ENSG00000171401)

Protein

Protein identifiers

Keratin, type II cuticular Hb6O43790 (reviewed: O43790)

Alternative names: Hair keratin K2.11, Keratin-86, Type II hair keratin Hb6, Type-II keratin Kb26

All UniProt accessions (2): O43790, U3KPR1

UniProt curated annotations — full annotation on UniProt →

Subunit / interactions. Heterotetramer of two type I and two type II keratins.

Tissue specificity. Synthesis begins slightly higher in the hair shaft than HB1 and HB3 and continues much farther up, ending in the keratogeneous zone.

Disease relevance. Monilethrix 1 (MNLIX1) [MIM:158000] A form of monilethrix, a disorder of the hair shaft characterized by brittle hair, follicular papules, and varying degrees of alopecia. Affected hairs have uniform elliptical nodes of normal thickness and intermittent constrictions, internodes at which the hair easily breaks. Usually only the scalp is involved, but in severe forms, the secondary sexual hair, eyebrows, eyelashes, and nails may also be affected. Inheritance is autosomal dominant. The disease is caused by variants affecting the gene represented in this entry.

Miscellaneous. There are two types of hair/microfibrillar keratin, I (acidic) and II (neutral to basic).

Similarity. Belongs to the intermediate filament family.

RefSeq proteins (1): NP_001307127* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR003054Keratin_IIFamily
IPR018039IF_conservedConserved_site
IPR032444Keratin_2_headDomain
IPR039008IF_rod_domDomain

Pfam: PF00038, PF16208

UniProt features (19 total): sequence variant 8, region of interest 7, chain 1, domain 1, sequence conflict 1, cross-link 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-O43790-F175.500.53

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 (1): 212

Function

Pathways and Gene Ontology

Reactome pathways

3 pathways

IDPathway
R-HSA-6805567Keratinization
R-HSA-6809371Formation of the cornified envelope
R-HSA-1266738Developmental Biology

MSigDB gene sets: 198 (showing top): GSE45365_CD8A_DC_VS_CD11B_DC_IFNAR_KO_MCMV_INFECTION_UP, GSE45365_NK_CELL_VS_CD11B_DC_UP, MODULE_52, GOBP_EPITHELIUM_DEVELOPMENT, MORF_FLT1, CAR_TNFRSF25, GOBP_INTERMEDIATE_FILAMENT_BASED_PROCESS, MORF_MSH3, GOBP_INTERMEDIATE_FILAMENT_ORGANIZATION, MODULE_45, MORF_BRCA1, MORF_ATRX, FOXO4_01, MORF_ESR1, MODULE_16

GO Biological Process (2): keratinization (GO:0031424), intermediate filament organization (GO:0045109)

GO Molecular Function (2): structural constituent of skin epidermis (GO:0030280), protein binding (GO:0005515)

GO Cellular Component (4): obsolete extracellular space (GO:0005615), cytosol (GO:0005829), keratin filament (GO:0045095), intermediate filament (GO:0005882)

Reactome top-level categories

Rollup of top-2 pathways:

CategoryPathways
Developmental Biology1
Keratinization1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
keratinocyte differentiation1
multicellular organismal process1
intermediate filament cytoskeleton organization1
supramolecular fiber organization1
structural molecule activity1
binding1
cytoplasm1
cellular anatomical structure1
intermediate filament1
intermediate filament cytoskeleton1
polymeric cytoskeletal fiber1

Protein interactions and networks

STRING

0 interactions, top by confidence (×1000):

IntAct

155 interactions, top by confidence:

ABTypeScore
KRT86KRT15psi-mi:“MI:0915”(physical association)0.780
KRT15KRT86psi-mi:“MI:0915”(physical association)0.780
CFTRESYT2psi-mi:“MI:2364”(proximity)0.710
KRT86KRT39psi-mi:“MI:0915”(physical association)0.630
MEOX2KRT86psi-mi:“MI:0915”(physical association)0.560
KRT86MEOX2psi-mi:“MI:0915”(physical association)0.560
KRT86KRT37psi-mi:“MI:0915”(physical association)0.560
KRT86KRT19psi-mi:“MI:0915”(physical association)0.560
KRT86KRT31psi-mi:“MI:0915”(physical association)0.560
KRT86KRT36psi-mi:“MI:0915”(physical association)0.560
KRT86KRT34psi-mi:“MI:0915”(physical association)0.560
KRT86KRT16psi-mi:“MI:0915”(physical association)0.560
KRT86KRT35psi-mi:“MI:0915”(physical association)0.560
KRT86KRT38psi-mi:“MI:0915”(physical association)0.560
KRT86KRT33Bpsi-mi:“MI:0915”(physical association)0.560
KRT86KRT25psi-mi:“MI:0915”(physical association)0.560
KRT86KRT40psi-mi:“MI:0915”(physical association)0.560
KRT86KRT27psi-mi:“MI:0915”(physical association)0.560
CYSRT1KRT86psi-mi:“MI:0915”(physical association)0.560
KRT86ODF1psi-mi:“MI:0915”(physical association)0.560
KRT86KRT14psi-mi:“MI:0915”(physical association)0.560
KRT86KRT32psi-mi:“MI:0915”(physical association)0.560
KRT86ZNF414psi-mi:“MI:0915”(physical association)0.560

BioGRID (89): KRT86 (Two-hybrid), MEOX2 (Two-hybrid), KRT86 (Affinity Capture-MS), KRT86 (Affinity Capture-MS), KRT86 (Affinity Capture-MS), KRT86 (Affinity Capture-MS), KRT86 (Two-hybrid), KRT86 (Two-hybrid), KRT86 (Two-hybrid), KRT86 (Two-hybrid), KRT86 (Two-hybrid), KRT86 (Two-hybrid), KRT86 (Two-hybrid), KRT86 (Two-hybrid), KRT86 (Two-hybrid)

ESM2 similar proteins: A4FUZ0, A5A6M5, A5A6P3, A6QNX5, A7YWK3, B0LKP1, B1AQ75, E1AB55, O43790, O76009, O76013, P02534, P15241, P19013, P25690, P25691, P78385, P78386, P97861, Q0P5J7, Q14525, Q14532, Q14533, Q148H4, Q148H5, Q148H7, Q148H8, Q14CN4, Q15323, Q3SY84, Q497I4, Q61765, Q61897, Q62168, Q6IG03, Q6IG04, Q6IME9, Q6IMF0, Q6NXH9, Q86Y46

Diamond homologs: A0A125S9M6, A0JND2, A4FUZ0, A5A6M8, A6NCN2, A7YWK3, O43790, P02542, P02545, P02547, P02548, P04104, P04260, P04261, P04262, P04263, P07196, P07744, P08551, P08928, P09010, P10999, P12035, P12036, P13647, P13648, P15241, P16884, P19013, P19246, P19527, P21619, P21910, P25691, P35908, P48671, P48672, P48678, P48679, P78385

SIGNOR signaling

0 interactions.

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 60 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
Formation of the cornified envelope1842.7×1e-23
Keratinization1827.1×3e-20

GO biological processes:

GO termPartnersFoldFDR
morphogenesis of an epithelium17106.3×5e-29
intermediate filament organization1878.8×2e-28
epithelial cell differentiation1547.9×5e-20
epidermis development519.1×3e-04

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic5
Likely pathogenic1
Uncertain significance86
Likely benign21
Benign34

Top pathogenic / likely-pathogenic (6)

Variant IDHGVSClassification
7609NM_001320198.2(KRT86):c.1237G>A (p.Glu413Lys)Pathogenic
7610NM_001320198.2(KRT86):c.1239G>T (p.Glu413Asp)Pathogenic
7612NM_001320198.2(KRT86):c.340A>G (p.Asn114Asp)Pathogenic
7613NM_001320198.2(KRT86):c.1204G>C (p.Glu402Gln)Pathogenic
7614NM_001320198.2(KRT86):c.353C>A (p.Ala118Glu)Pathogenic
7611NM_001320198.2(KRT86):c.1204G>A (p.Glu402Lys)Likely pathogenic

SpliceAI

2577 predictions. Top by Δscore:

VariantEffectΔscore
12:52286789:A:ACdonor_gain1.0000
12:52286790:C:CCdonor_gain1.0000
12:52287097:CCCA:Cdonor_loss1.0000
12:52287099:CA:Cdonor_loss1.0000
12:52287100:A:ACdonor_gain1.0000
12:52287100:ACC:Adonor_loss1.0000
12:52287101:C:CAdonor_loss1.0000
12:52287101:C:CCdonor_gain1.0000
12:52287101:CCT:Cdonor_gain1.0000
12:52287187:C:CAdonor_gain1.0000
12:52287318:GAGTT:Gacceptor_gain1.0000
12:52287319:AGTT:Aacceptor_gain1.0000
12:52287319:AGTTC:Aacceptor_gain1.0000
12:52287320:GTT:Gacceptor_gain1.0000
12:52287320:GTTCT:Gacceptor_gain1.0000
12:52287321:TT:Tacceptor_gain1.0000
12:52287321:TTCT:Tacceptor_gain1.0000
12:52287322:TCTGA:Tacceptor_gain1.0000
12:52287323:C:CCacceptor_gain1.0000
12:52287323:CTG:Cacceptor_gain1.0000
12:52287324:T:Aacceptor_gain1.0000
12:52287324:T:Cacceptor_loss1.0000
12:52287333:C:CTacceptor_gain1.0000
12:52287334:A:Tacceptor_gain1.0000
12:52287594:A:Tdonor_loss1.0000
12:52287595:CCTG:Cdonor_gain1.0000
12:52287597:TGGC:Tdonor_gain1.0000
12:52287613:C:CTdonor_gain1.0000
12:52287614:C:CTdonor_gain1.0000
12:52287717:TCAC:Tacceptor_gain1.0000

AlphaMissense

3178 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
12:52304168:G:CK212N0.995
12:52304168:G:TK212N0.995
12:52306259:T:CL409P0.995
12:52302265:T:CF117L0.994
12:52302267:C:AF117L0.994
12:52302267:C:GF117L0.994
12:52302266:T:CF117S0.993
12:52305757:T:CL332P0.993
12:52305777:G:CA339P0.993
12:52306221:G:CK396N0.993
12:52306221:G:TK396N0.993
12:52306249:T:CY406H0.993
12:52306229:T:CL399P0.991
12:52306239:G:CE402D0.991
12:52306239:G:TE402D0.991
12:52306243:G:CA404P0.991
12:52306249:T:GY406D0.991
12:52306241:T:GI403S0.990
12:52302258:C:AN114K0.989
12:52302258:C:GN114K0.989
12:52303119:A:CQ130P0.989
12:52306165:G:CA378P0.989
12:52302254:T:CL113P0.988
12:52303110:T:CL127P0.988
12:52302266:T:GF117C0.987
12:52302274:T:CF120L0.987
12:52302276:C:AF120L0.987
12:52302276:C:GF120L0.987
12:52304154:T:CF208L0.987
12:52304156:T:AF208L0.987

dbSNP variants (sampled 300 via entrez): RS1000437601 (12:52288662 C>T), RS1000599780 (12:52282815 T>C), RS1000746592 (12:52289181 A>G), RS1000833401 (12:52295813 A>G), RS1000869663 (12:52276868 G>A,C), RS1000922207 (12:52277128 G>A), RS1000994955 (12:52291963 T>G), RS1001067984 (12:52301963 C>G,T), RS1001178166 (12:52287906 A>T), RS1001452533 (12:52283682 A>G,T), RS1001470675 (12:52273156 A>G), RS1001595314 (12:52279580 A>G,T), RS1001666387 (12:52295098 G>A), RS1001870986 (12:52282063 C>G,T), RS1001996880 (12:52293424 T>C)

Disease associations

OMIM: gene MIM:601928 | disease phenotypes: MIM:158000

GenCC curated gene-disease

DiseaseClassificationInheritance
monilethrixStrongAutosomal dominant
monilethrix-1StrongAutosomal dominant

Mondo (2): monilethrix (MONDO:0008009), monilethrix-1 (MONDO:0700343)

Orphanet (1): Monilethrix (Orphanet:573)

HPO phenotypes

23 total (23 of 23 shown, HPO-id order):

HPOTerm
HP:0000006Autosomal dominant inheritance
HP:0000164Abnormality of the dentition
HP:0000499Abnormal eyelash morphology
HP:0000518Cataract
HP:0000534Abnormal eyebrow morphology
HP:0001249Intellectual disability
HP:0001596Alopecia
HP:0001597Abnormal nail morphology
HP:0002164Nail dysplasia
HP:0002213Fine hair
HP:0002217Slow-growing hair
HP:0002232Patchy alopecia
HP:0002299Brittle hair
HP:0003593Infantile onset
HP:0003828Variable expressivity
HP:0007468Perifollicular hyperkeratosis
HP:0007502Follicular hyperkeratosis
HP:0008070Sparse hair
HP:0008404Nail dystrophy
HP:0010719Abnormality of hair texture
HP:0032152Keratosis pilaris
HP:0100543Cognitive impairment
HP:0100753Schizophrenia

GWAS associations

4 associations (top):

StudyTraitp-value
GCST002359_4Plasma amyloid beta peptide concentrations (ABx-42)2.000000e-06
GCST002875_23Diisocyanate-induced asthma1.000000e-06
GCST006988_173Blond vs. brown/black hair color2.000000e-12
GCST007637_15Diffusing capacity of carbon monoxide7.000000e-06

EFO canonical traits (4, from GWAS)

EFO IDTrait name
EFO:0005660plasma beta-amyloid 1-42 measurement
EFO:0006995response to diisocyanate
EFO:0003924hair color
EFO:0009369diffusing capacity of the lung for carbon monoxide

MeSH disease descriptors (1)

DescriptorNameTree numbers
D056734MonilethrixC16.131.077.592; C16.320.850.647; C17.800.329.984; C17.800.827.602

Drugs & pharmacology

Drug and pharmacology data

Is drug target: yes

ChEMBL targets (1): CHEMBL4523139 (SINGLE PROTEIN)

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

CTD chemical–gene interactions

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

ChemicalActions (top 5)PubMed papers
Acetaminophendecreases expression, increases expression2
Estradiolaffects expression, increases reaction, decreases expression2
Cyclosporinedecreases expression, increases expression2
GSK-J4decreases expression1
afuresertibincreases expression1
sotorasibaffects cotreatment, increases expression1
propionaldehydeincreases expression1
sulforaphanedecreases expression1
sodium arsenitedecreases expression1
butylbenzyl phthalateincreases expression1
vanadyl sulfateincreases expression1
homosalateaffects cotreatment, decreases expression1
abrinedecreases expression1
jinfukangaffects cotreatment, decreases expression1
trametinibaffects cotreatment, increases expression1
NVP-BKM120affects cotreatment, increases expression1
Temozolomideincreases expression1
Air Pollutantsdecreases expression, increases abundance1
Benzo(a)pyreneaffects methylation1
Cisplatinaffects cotreatment, decreases expression1
Fluorouracildecreases expression, affects response to substance1
Hydrogen Peroxideincreases expression1
Polystyrenesaffects cotreatment, decreases expression1
Progesteroneincreases expression1
Silicon Dioxidedecreases expression1
Smokedecreases expression1
Tamoxifendecreases expression1
Tretinoinincreases expression1
Vitalliumdecreases expression1
Aflatoxin B1decreases expression1

ChEMBL screening assays

1 unique, capped per target: 1 binding

Representative assays (with source publication via chembl_document):

Assay IDTypeDescriptionSource paper
CHEMBL4341411BindingBinding affinity to KRT86 in human A549 cells lysates grown on SILAC media at 10 uM incubated for 1 hr by LC-MS/MS analysis relative to untreated controlProfiling withanolide A for therapeutic targets in neurodegenerative diseases. — Bioorg Med Chem

Clinical trials (associated diseases)

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