KRT71

gene
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Also known as KRT6IRSKRT6IRS1K6IRS1

Summary

KRT71 (keratin 71, HGNC:28927) is a protein-coding gene on chromosome 12q13.13, encoding Keratin, type II cytoskeletal 71 (Q3SY84). Plays a central role in hair formation.

Keratins are intermediate filament proteins responsible for the structural integrity of epithelial cells and are subdivided into epithelial keratins and hair keratins. This gene encodes a protein that is expressed in the inner root sheath of hair follicles. The type II keratins are clustered in a region of chromosome 12q13.

Source: NCBI Gene 112802 — RefSeq curated summary.

At a glance

  • Gene–disease (curated): hypotrichosis 13 (Moderate, GenCC) — +1 more curated relationship
  • Clinical variants (ClinVar): 206 total — 2 pathogenic
  • Phenotypes (HPO): 19
  • MANE Select transcript: NM_033448

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:28927
Approved symbolKRT71
Namekeratin 71
Location12q13.13
Locus typegene with protein product
StatusApproved
AliasesKRT6IRS, KRT6IRS1, K6IRS1
Ensembl geneENSG00000139648
Ensembl biotypeprotein_coding
OMIM608245
Entrez112802

Gene structure

Transcript identifiers

Ensembl transcripts: 1 — 1 protein_coding

ENST00000267119

RefSeq mRNA: 1 — MANE Select: NM_033448 NM_033448

CCDS: CCDS8831

Canonical transcript exons

ENST00000267119 — 9 exons

ExonStartEnd
ENSE000009394885254628652546506
ENSE000010609045255263752553145
ENSE000010609235254870152548796
ENSE000010609295254556552545599
ENSE000011167405254390952544743
ENSE000016295625254815252548316
ENSE000016436205254929352549353
ENSE000016722585254785752547982
ENSE000017043775255002952550243

Expression profiles

Bgee: expression breadth broad, 48 present calls, max score 97.19.

FANTOM5 (CAGE): breadth tissue_specific, TPM avg 0.0659 / max 100.3651, expressed in 4 samples.

FANTOM5 promoters (1 alternative TSS)

Promoter IDTPM avgSamples expressed
1310950.06594

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
upper arm skinUBERON:000426397.19gold quality
skin of hipUBERON:000155477.53gold quality
nippleUBERON:000203067.29gold quality
ileal mucosaUBERON:000033165.17silver quality
pancreatic ductal cellCL:000207961.24silver quality
tibialis anteriorUBERON:000138559.87silver quality
zone of skinUBERON:000001458.24gold quality
skin of legUBERON:000151157.85gold quality
upper leg skinUBERON:000426256.97silver quality
epithelial cell of pancreasCL:000008354.80gold quality
cardiac muscle of right atriumUBERON:000337954.34gold quality
left ventricle myocardiumUBERON:000656654.23gold quality
kidney epitheliumUBERON:000481953.93gold quality
skin of abdomenUBERON:000141653.66gold quality
deltoidUBERON:000147650.77gold quality
myocardiumUBERON:000234950.25gold quality
nasal cavity epitheliumUBERON:000538447.03gold quality
quadriceps femorisUBERON:000137746.94gold quality
amniotic fluidUBERON:000017345.50gold quality
vastus lateralisUBERON:000137945.40gold quality
right lungUBERON:000216744.40gold quality
layer of synovial tissueUBERON:000761643.55gold quality
skeletal muscle tissue of rectus abdominisUBERON:000451143.37gold quality
corpus epididymisUBERON:000435942.95gold quality
secondary oocyteCL:000065542.57gold quality
sural nerveUBERON:001548842.19gold quality
skeletal muscle tissueUBERON:000113441.79gold quality
muscle tissueUBERON:000238541.77gold quality
superficial temporal arteryUBERON:000161441.33gold quality
palpebral conjunctivaUBERON:000181241.10gold quality

Single-cell (SCXA)

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

ExperimentMarker?Max mean expression
E-ANND-3no1.63

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

38 targeting KRT71, 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-4713-3P100.0065.92505
HSA-MIR-4481100.0066.421669
HSA-MIR-4455100.0065.481587
HSA-MIR-365899.9673.874379
HSA-MIR-651-3P99.9473.485177
HSA-MIR-449399.9066.48977
HSA-MIR-449299.8768.253611
HSA-MIR-221-5P99.8665.451052
HSA-MIR-807399.8665.211118
HSA-MIR-444799.8567.812900
HSA-MIR-473999.8465.251832
HSA-MIR-451699.6167.783390
HSA-MIR-76299.5866.611994
HSA-MIR-444199.4966.563216
HSA-MIR-449899.4767.422360
HSA-MIR-302A-5P99.3968.211913
HSA-MIR-94099.3766.142064
HSA-MIR-6507-5P99.3670.462524
HSA-MIR-6808-5P99.3166.232150
HSA-MIR-6893-5P99.3166.252119
HSA-MIR-450599.2767.812678
HSA-MIR-578799.2267.862628
HSA-MIR-5001-5P99.0566.761972
HSA-MIR-427099.0266.261987
HSA-MIR-6840-3P98.6865.951923
HSA-MIR-6728-3P98.6367.631534
HSA-MIR-6754-5P98.6065.541627
HSA-MIR-6776-5P98.5467.431304
HSA-MIR-6878-5P98.4967.912142
HSA-MIR-366597.7365.08975

Literature-anchored findings (GeneRIF, showing 2)

  • A novel epithelial keratin, hK6irs1, is expressed differentially in all layers of the inner root sheath, including specialized huxley cells (Flugelzellen) of the human hair follicle.(HK6IRS1) (PMID:11982755)
  • Demonstration of the heterozygous mutation c.422T>G (p.Phe141Cys) within the helix initiation motif of the inner root sheath-specific keratin K71 (KRT71) gene in affected family members with autosomal dominant woolly hair/hypotrichosis. (PMID:22592156)

Cross-species orthologs

2 orthologs

OrganismSymbolGene ID
mus_musculusKrt71ENSMUSG00000051879
rattus_norvegicusKrt71ENSRNOG00000049495

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), INA (ENSG00000148798), LMNTD1 (ENSG00000152936), LMNA (ENSG00000160789), KRT84 (ENSG00000161849), KRT82 (ENSG00000161850), KRT80 (ENSG00000167767), KRT1 (ENSG00000167768), KRT24 (ENSG00000167916), KRT8 (ENSG00000170421), KRT78 (ENSG00000170423), KRT86 (ENSG00000170442), 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 cytoskeletal 71Q3SY84 (reviewed: Q3SY84)

Alternative names: Cytokeratin-71, Keratin-71, Type II inner root sheath-specific keratin-K6irs1, Type-II keratin Kb34

All UniProt accessions (1): Q3SY84

UniProt curated annotations — full annotation on UniProt →

Function. Plays a central role in hair formation. Essential component of keratin intermediate filaments in the inner root sheath (IRS) of the hair follicle.

Subunit / interactions. Heterodimer of a type I and a type II keratin. Associates with KRT16 and/or KRT17.

Subcellular location. Cytoplasm. Cytoskeleton.

Tissue specificity. Highly expressed in hair follicles from scalp. Specifically expressed in the inner root sheath (IRS) of the hair follicle. Present in the all 3 IRS layers: the cuticle, the Henle and the Huxley layers. Also detected in the pseudopods of specialized Huxley cells, termed Fluegelzellen, along the area of differentiated Henle cells (at protein level).

Disease relevance. Hypotrichosis 13 (HYPT13) [MIM:615896] A form of hypotrichosis, a condition characterized by the presence of less than the normal amount of hair and abnormal hair follicles and shafts, which are thin and atrophic. The extent of scalp and body hair involvement can be very variable, within as well as between families. HYPT13 is an autosomal dominant form characterized by sparse woolly hair. The disease is caused by variants affecting the gene represented in this entry.

Miscellaneous. There are two types of cytoskeletal and microfibrillar keratin, I (acidic) and II (neutral to basic) (40-55 and 56-70 kDa, respectively).

Similarity. Belongs to the intermediate filament family.

RefSeq proteins (1): NP_258259* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR003054Keratin_IIFamily
IPR018039IF_conservedConserved_site
IPR032444Keratin_2_headDomain
IPR039008IF_rod_domDomain

Pfam: PF00038, PF16208

UniProt features (20 total): region of interest 8, sequence variant 6, compositionally biased region 2, chain 1, domain 1, site 1, sequence conflict 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q3SY84-F172.660.52

Functional residue map

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

Catalytic / active sites (1): 381 (stutter)

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: 89 (showing top): GOBP_MORPHOGENESIS_OF_AN_EPITHELIUM, GOBP_EPITHELIUM_DEVELOPMENT, GOBP_EPIDERMIS_MORPHOGENESIS, GOBP_INTERMEDIATE_FILAMENT_BASED_PROCESS, GOBP_INTERMEDIATE_FILAMENT_ORGANIZATION, GOBP_EPIDERMAL_CELL_DIFFERENTIATION, MARTINEZ_RB1_TARGETS_DN, GOBP_MOLTING_CYCLE, GOZGIT_ESR1_TARGETS_UP, GOBP_EPIDERMIS_DEVELOPMENT, GOBP_KERATINIZATION, GOBP_SKIN_DEVELOPMENT, GOBP_TISSUE_MORPHOGENESIS, GOCC_INTERMEDIATE_FILAMENT_CYTOSKELETON, GOCC_KERATIN_FILAMENT

GO Biological Process (3): hair follicle morphogenesis (GO:0031069), 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 (6): cytosol (GO:0005829), keratin filament (GO:0045095), extracellular exosome (GO:0070062), cytoplasm (GO:0005737), cytoskeleton (GO:0005856), 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
cellular anatomical structure2
hair follicle development1
anatomical structure morphogenesis1
hair cycle process1
epidermis morphogenesis1
keratinocyte differentiation1
multicellular organismal process1
intermediate filament cytoskeleton organization1
supramolecular fiber organization1
structural molecule activity1
binding1
cytoplasm1
intermediate filament1
extracellular vesicle1
intracellular anatomical structure1
intracellular membraneless organelle1
intermediate filament cytoskeleton1
polymeric cytoskeletal fiber1

Protein interactions and networks

STRING

560 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
KRT71RSPO2Q6UXX9910
KRT71FGF5P12034882
KRT71PDIK1LQ8N165547
KRT71GORABQ5T7V8521
KRT71MAP3K21Q5TCX8508
KRT71HOXC13P31276503
KRT71PTPRKQ15262480
KRT71FOXI3A8MTJ6457
KRT71RSPO3Q9BXY4448
KRT71GUCY2FP51841445
KRT71KRTAP9-1A8MXZ3421
KRT71FOXN1O15353418
KRT71TCHHQ07283416
KRT71KRTAP4-16G5E9R7413
KRT71MYLK2Q9H1R3411

IntAct

87 interactions, top by confidence:

ABTypeScore
KRT71KRT38psi-mi:“MI:0915”(physical association)0.720
KRT15KRT71psi-mi:“MI:0915”(physical association)0.720
KRT31KRT71psi-mi:“MI:0915”(physical association)0.720
KRT40KRT71psi-mi:“MI:0915”(physical association)0.720
KRT38KRT71psi-mi:“MI:0915”(physical association)0.720
KRT71KRT40psi-mi:“MI:0915”(physical association)0.720
KRT71KRT13psi-mi:“MI:0915”(physical association)0.560
KRT13KRT71psi-mi:“MI:0915”(physical association)0.560
KRT16KRT71psi-mi:“MI:0915”(physical association)0.560
KRT33BKRT71psi-mi:“MI:0915”(physical association)0.560
KRT37KRT71psi-mi:“MI:0915”(physical association)0.560
KRT71KRT26psi-mi:“MI:0915”(physical association)0.560
KRT18KRT71psi-mi:“MI:0915”(physical association)0.560
KRT19KRT71psi-mi:“MI:0915”(physical association)0.560
KRT71USHBP1psi-mi:“MI:0915”(physical association)0.560
KRT71KRT27psi-mi:“MI:0915”(physical association)0.560
KRT71KRT35psi-mi:“MI:0915”(physical association)0.560
KRT71WASHC3psi-mi:“MI:0915”(physical association)0.560
KRT71KRT28psi-mi:“MI:0915”(physical association)0.560

BioGRID (53): KRT71 (Two-hybrid), KRT71 (Two-hybrid), KRT71 (Two-hybrid), KRT71 (Two-hybrid), KRT40 (Two-hybrid), KRT71 (Affinity Capture-MS), KRT71 (Affinity Capture-MS), KRT71 (Affinity Capture-MS), KRT71 (Two-hybrid), KRT71 (Two-hybrid), KRT71 (Two-hybrid), KRT71 (Two-hybrid), KRT71 (Two-hybrid), KRT71 (Two-hybrid), KRT71 (Two-hybrid)

ESM2 similar proteins: A0JND2, A3KN27, A6BLY7, A6H712, A6QNX5, A6QQJ3, A7YWK3, D3ZER2, E1AB55, O76014, O76015, P08552, P15331, P21807, P35617, P41219, P46660, P48670, Q0VBK2, Q13515, Q148H5, Q148H6, Q148H8, Q14CN4, Q28177, Q3SY84, Q3TRJ4, Q6A162, Q6IFW3, Q6IFW8, Q6IFX0, Q6IFX4, Q6IFZ9, Q6IG04, Q6IME9, Q6IMF1, Q6KB66, Q6NVD9, Q6NXH9, Q7RTS7

Diamond homologs: A0A8C0N8E3, A0JND2, A3KN27, A4FUZ0, A5A6M6, A5A6M8, A5A6N0, A6QNX5, A6QQJ3, A7YWK3, E1AB55, O43790, O93532, O95678, P02538, P04104, P04259, P04264, P04265, P04266, P05786, P05787, P07744, P08670, P08729, P08776, P11679, P12035, P13647, P15241, P15331, P16878, P18520, P19013, P21807, P25691, P35908, P41219, P48616, P48668

SIGNOR signaling

0 interactions.

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 37 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 envelope1749.8×3e-24
Keratinization1731.6×6e-21

GO biological processes:

GO termPartnersFoldFDR
morphogenesis of an epithelium16166.8×4e-31
intermediate filament organization16116.7×1e-28
epithelial cell differentiation1579.8×5e-24

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic2
Likely pathogenic0
Uncertain significance129
Likely benign27
Benign43

Top pathogenic / likely-pathogenic (2)

Variant IDHGVSClassification
140460NM_033448.3(KRT71):c.422T>G (p.Phe141Cys)Pathogenic
152062GRCh38/hg38 12q13.12-13.13(chr12:50633888-52851909)x1Pathogenic

SpliceAI

1358 predictions. Top by Δscore:

VariantEffectΔscore
12:52546308:G:Cdonor_gain1.0000
12:52546502:GAAGC:Gacceptor_gain1.0000
12:52546504:AGC:Aacceptor_gain1.0000
12:52546505:GC:Gacceptor_gain1.0000
12:52546506:CC:Cacceptor_gain1.0000
12:52546506:CCTA:Cacceptor_loss1.0000
12:52546507:C:CAacceptor_loss1.0000
12:52546507:C:CCacceptor_gain1.0000
12:52547851:TCTCA:Tdonor_loss1.0000
12:52547852:CTCAC:Cdonor_loss1.0000
12:52547853:TCA:Tdonor_loss1.0000
12:52547854:CACC:Cdonor_loss1.0000
12:52547855:A:Tdonor_loss1.0000
12:52547856:C:Adonor_loss1.0000
12:52547856:CCTG:Cdonor_gain1.0000
12:52547983:C:CCacceptor_gain1.0000
12:52547993:C:Tacceptor_gain1.0000
12:52548147:CTCAC:Cdonor_loss1.0000
12:52548150:A:AGdonor_loss1.0000
12:52548151:C:Tdonor_loss1.0000
12:52548185:A:ACdonor_gain1.0000
12:52548186:C:CCdonor_gain1.0000
12:52548186:CT:Cdonor_gain1.0000
12:52548263:C:CTacceptor_gain1.0000
12:52548263:C:Tacceptor_gain1.0000
12:52548312:ATCTC:Aacceptor_gain1.0000
12:52548314:CTC:Cacceptor_gain1.0000
12:52548315:TC:Tacceptor_gain1.0000
12:52548316:CC:Cacceptor_gain1.0000
12:52548317:C:CCacceptor_gain1.0000

AlphaMissense

3446 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
12:52549296:C:AK238N0.999
12:52549296:C:GK238N0.999
12:52546476:C:GA379P0.998
12:52549308:A:CF234L0.998
12:52549308:A:TF234L0.998
12:52549310:A:GF234L0.998
12:52547909:A:GL351P0.997
12:52552655:G:CF141L0.997
12:52552655:G:TF141L0.997
12:52552657:A:GF141L0.997
12:52546488:C:GA375P0.996
12:52549322:C:GA230P0.996
12:52549330:C:GR227P0.996
12:52552656:A:GF141S0.995
12:52548175:C:GA319P0.994
12:52552656:A:CF141C0.994
12:52547939:A:GL341P0.993
12:52549300:A:GL237P0.993
12:52552665:T:AN138I0.993
12:52547903:C:GR353P0.992
12:52549298:T:CK238E0.992
12:52552664:G:CN138K0.992
12:52552664:G:TN138K0.992
12:52552668:A:GL137P0.992
12:52547900:A:GL354P0.991
12:52550122:A:GL188P0.991
12:52546307:A:GL435P0.990
12:52546496:A:GL372P0.990
12:52549297:T:GK238T0.990
12:52549309:A:GF234S0.990

dbSNP variants (sampled 300 via entrez): RS1000114873 (12:52547781 T>C,G), RS1000124215 (12:52549492 G>A,C,T), RS1000333428 (12:52553077 T>A,C), RS1000520681 (12:52552198 A>G), RS1001389864 (12:52553381 G>A), RS1001588374 (12:52545318 G>A), RS1002280368 (12:52554561 C>T), RS1002367025 (12:52544224 G>A,T), RS1003044768 (12:52546594 A>G), RS1003109793 (12:52551896 C>A,G), RS1003142489 (12:52551667 G>A,T), RS1003388757 (12:52545012 T>C), RS1003402323 (12:52550889 T>G), RS1003435443 (12:52550583 C>T), RS1003469538 (12:52552107 G>A)

Disease associations

OMIM: gene MIM:608245 | disease phenotypes: MIM:615896

GenCC curated gene-disease

DiseaseClassificationInheritance
hypotrichosis 13ModerateAutosomal dominant
isolated familial wooly hair disorderSupportiveAutosomal dominant

Mondo (2): hypotrichosis 13 (MONDO:0014390), isolated familial wooly hair disorder (MONDO:0008686)

Orphanet (1): Woolly hair (Orphanet:170)

HPO phenotypes

19 total (19 of 19 shown, HPO-id order):

HPOTerm
HP:0000006Autosomal dominant inheritance
HP:0000479Abnormal retinal morphology
HP:0000486Strabismus
HP:0000518Cataract
HP:0000615Abnormal pupil morphology
HP:0000653Sparse eyelashes
HP:0000971Abnormal sweat gland morphology
HP:0002213Fine hair
HP:0002217Slow-growing hair
HP:0002224Woolly hair
HP:0002231Sparse body hair
HP:0002299Brittle hair
HP:0003577Congenital onset
HP:0005338Sparse lateral eyebrow
HP:0005599Hypopigmentation of hair
HP:0006482Abnormal dental morphology
HP:0008070Sparse hair
HP:0010719Abnormality of hair texture
HP:0011121Abnormal skin morphology

GWAS associations

0 associations (top):

MeSH disease descriptors (1)

DescriptorNameTree numbers
C536745Woolly hair, congenital (supp.)

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

10 total (human), top 10 by PubMed support.

ChemicalActions (top 5)PubMed papers
aflatoxin B2increases methylation1
K 7174increases expression1
Resveratrolaffects cotreatment, decreases expression1
Arsenic Trioxidedecreases expression1
Arsenicaffects methylation1
Atrazineincreases expression1
Benzo(a)pyreneincreases methylation1
Methotrexatedecreases expression1
Plant Extractsaffects cotreatment, decreases expression1
Silicon Dioxidedecreases expression1

Clinical trials (associated diseases)

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