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Aliases for KRT4 Gene

Aliases for KRT4 Gene

  • Keratin 4, Type II 2 3
  • CYK4 3 4 6
  • Type-II Keratin Kb4 3 4
  • Cytokeratin 4 2 3
  • CK-4 3 4
  • K4 3 4
  • Keratin, Type II Cytoskeletal 4 3
  • Type II Cytoskeletal 4 2
  • Cytokeratin-4 4
  • Keratin 4 2
  • Keratin-4 4
  • Keratin 2
  • WSN1 3
  • CK4 3

External Ids for KRT4 Gene

Previous HGNC Symbols for KRT4 Gene

  • CYK4

Previous GeneCards Identifiers for KRT4 Gene

  • GC12M053448
  • GC12P053657
  • GC12M052627
  • GC12M051486
  • GC12M053200
  • GC12M050244

Summaries for KRT4 Gene

Entrez Gene Summary for KRT4 Gene

  • The protein encoded by this gene is a member of the keratin gene family. The type II cytokeratins consist of basic or neutral proteins which are arranged in pairs of heterotypic keratin chains coexpressed during differentiation of simple and stratified epithelial tissues. This type II cytokeratin is specifically expressed in differentiated layers of the mucosal and esophageal epithelia with family member KRT13. Mutations in these genes have been associated with White Sponge Nevus, characterized by oral, esophageal, and anal leukoplakia. The type II cytokeratins are clustered in a region of chromosome 12q12-q13. [provided by RefSeq, Jul 2008]

GeneCards Summary for KRT4 Gene

KRT4 (Keratin 4, Type II) is a Protein Coding gene. Diseases associated with KRT4 include white sponge nevus 1 and white sponge nevus of cannon, krt4-related. Among its related pathways are Cytoskeletal Signaling and Cytoskeleton remodeling Neurofilaments. GO annotations related to this gene include structural molecule activity. An important paralog of this gene is KRT82.

Gene Wiki entry for KRT4 Gene

No data available for UniProtKB/Swiss-Prot , Tocris Summary , PharmGKB "VIP" Summary , fRNAdb sequence ontologies and piRNA Summary for KRT4 Gene

Genomics for KRT4 Gene

Regulatory Elements for KRT4 Gene

Genomic Location for KRT4 Gene

52,806,543 bp from pter
52,814,551 bp from pter
8,009 bases
Minus strand

Genomic View for KRT4 Gene

UCSC Golden Path with GeneCards custom track
Cytogenetic band:
Genomic Location for KRT4 Gene
GeneLoc Logo Genomic Neighborhood Exon StructureGene Density

RefSeq DNA sequence for KRT4 Gene

Proteins for KRT4 Gene

  • Protein details for KRT4 Gene (UniProtKB/Swiss-Prot)

    Protein Symbol:
    Recommended name:
    Keratin, type II cytoskeletal 4
    Protein Accession:
    Secondary Accessions:
    • F8VS64
    • Q6GTR8
    • Q96LA7
    • Q9BTL1

    Protein attributes for KRT4 Gene

    534 amino acids
    Molecular mass:
    57285 Da
    Quaternary structure:
    • Heterotetramer of two type I and two type II keratins. Keratin-4 is generally associated with keratin-13
    • There are two types of cytoskeletal and microfibrillar keratin: I (acidic; 40-55 kDa) and II (neutral to basic; 56-70 kDa)

neXtProt entry for KRT4 Gene

Proteomics data for KRT4 Gene at MOPED

Post-translational modifications for KRT4 Gene

  • Modification sites at PhosphoSitePlus
  • Modification sites at neXtProt

Other Protein References for KRT4 Gene

ENSEMBL proteins:
REFSEQ proteins:

Antibody Products

  • Cell Signaling Technology (CST) Antibodies for KRT4 (K4)

No data available for DME Specific Peptides for KRT4 Gene

Domains for KRT4 Gene

Gene Families for KRT4 Gene

  • IFF2 :Intermediate filaments type II, keratins (basic)

Suggested Antigen Peptide Sequences for KRT4 Gene

GenScript: Design optimal peptide antigens:

Graphical View of Domain Structure for InterPro Entry



  • P19013
  • Belongs to the intermediate filament family.
genes like me logo Genes that share domains with KRT4: view

Function for KRT4 Gene

Molecular function for KRT4 Gene

GENATLAS Biochemistry:
keratin 4,type II,non cornifying mucosal epithelia (buccal,nasal,esophageal,anogenital)

Gene Ontology (GO) - Molecular Function for KRT4 Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0005198 structural molecule activity IEA --
GO:0005515 protein binding IPI 17709412
genes like me logo Genes that share ontologies with KRT4: view
genes like me logo Genes that share phenotypes with KRT4: view

Animal Models for KRT4 Gene

MGI Knock Outs for KRT4:

miRNA for KRT4 Gene

miRTarBase miRNAs that target KRT4

miRNA Products

Inhibitory RNA Products

  • Predesigned siRNA for gene silencing in human,mouse,rat for KRT4

In Situ Assay Products

Flow Cytometry Products

No data available for Enzyme Numbers (IUBMB) , Transcription Factor Targeting and HOMER Transcription for KRT4 Gene

Localization for KRT4 Gene

Subcellular locations from

Jensen Localization Image for KRT4 Gene COMPARTMENTS Subcellular localization image for KRT4 gene
Compartment Confidence
cytoskeleton 5
cytosol 3
nucleus 2
extracellular 1

Gene Ontology (GO) - Cellular Components for KRT4 Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0005634 nucleus IDA 21630459
GO:0005882 intermediate filament NAS 2452170
GO:0009986 cell surface IDA 17709412
GO:0045095 keratin filament IDA 21371075
GO:0045111 intermediate filament cytoskeleton IDA 21371075
genes like me logo Genes that share ontologies with KRT4: view

No data available for Subcellular locations from UniProtKB/Swiss-Prot for KRT4 Gene

Pathways for KRT4 Gene

genes like me logo Genes that share pathways with KRT4: view

Pathways by source for KRT4 Gene

1 Cell Signaling Technology pathway for KRT4 Gene
1 GeneGo (Thomson Reuters) pathway for KRT4 Gene

Gene Ontology (GO) - Biological Process for KRT4 Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0007010 cytoskeleton organization NAS 2452170
GO:0030855 epithelial cell differentiation ISS --
GO:0050680 negative regulation of epithelial cell proliferation ISS --
genes like me logo Genes that share ontologies with KRT4: view

Compounds for KRT4 Gene

(5) Novoseek inferred chemical compound relationships for KRT4 Gene

Compound -log(P) Hits PubMed IDs
retinoic acid 46.5 10
retinoid 42.6 4
vitamin a 22.9 1
progesterone 0 1
estrogen 0 2
genes like me logo Genes that share compounds with KRT4: view

Transcripts for KRT4 Gene

Unigene Clusters for KRT4 Gene

Keratin 4:
Representative Sequences:

miRNA Products

Inhibitory RNA Products

  • Predesigned siRNA for gene silencing in human,mouse,rat for KRT4

Primer Products

Flow Cytometry Products

Alternative Splicing Database (ASD) splice patterns (SP) for KRT4 Gene

ExUns: 1 ^ 2a · 2b ^ 3a · 3b · 3c ^ 4a · 4b · 4c ^ 5a · 5b · 5c ^ 6 ^ 7 ^ 8a · 8b ^ 9 ^ 10
SP1: - -
SP2: - - -
SP3: - - - - -
SP4: - - -
SP5: -

Relevant External Links for KRT4 Gene

GeneLoc Exon Structure for
ECgene alternative splicing isoforms for

Expression for KRT4 Gene

mRNA expression in normal human tissues for KRT4 Gene

mRNA expression in embryonic tissues and stem cells from LifeMap Discovery

mRNA differential expression in normal tissues according to GTEx for KRT4 Gene

This gene is overexpressed in Esophagus - Mucosa (38.5), Minor Salivary Gland (7.6), and Vagina (4.4).

Protein differential expression in normal tissues for KRT4 Gene

This gene is overexpressed in Saliva (48.6), Esophagus (9.6), and Urine (7.6).

Integrated Proteomics: protein expression from ProteomicsDB, PaxDb, and MOPED for KRT4 Gene

SOURCE GeneReport for Unigene cluster for KRT4 Gene Hs.654610

mRNA Expression by UniProt/SwissProt for KRT4 Gene

Tissue specificity: Detected in the suprabasal layer of the stratified epithelium of the esophagus, exocervix, vagina, mouth and lingual mucosa, and in cells and cell clusters in the mucosa and serous gland ducts of the esophageal submucosa (at protein level). Expressed widely in the exocervix and esophageal epithelium, with lowest levels detected in the basal cell layer.
genes like me logo Genes that share expressions with KRT4: view

Expression partners for KRT4 Gene

In Situ Assay Products

Orthologs for KRT4 Gene

This gene was present in the common ancestor of chordates.

Orthologs for KRT4 Gene

Organism Taxonomy Gene Similarity Type Details
(Bos Taurus)
Mammalia KRT4 35
  • 86.01 (n)
  • 86.74 (a)
KRT4 36
  • 82 (a)
(Canis familiaris)
Mammalia KRT4 35
  • 85.26 (n)
  • 86.87 (a)
KRT71 36
  • 76 (a)
(Mus musculus)
Mammalia Krt4 35
  • 83.05 (n)
  • 83.33 (a)
Krt4 16
Krt4 36
  • 81 (a)
(Pan troglodytes)
Mammalia KRT4 35
  • 98.46 (n)
  • 98.08 (a)
KRT4 36
  • 87 (a)
(Rattus norvegicus)
Mammalia Krt4 35
  • 81.97 (n)
  • 82.62 (a)
(Monodelphis domestica)
Mammalia KRT4 36
  • 74 (a)
(Ornithorhynchus anatinus)
Mammalia -- 36
  • 73 (a)
(Gallus gallus)
Aves KRT4 35
  • 70.63 (n)
  • 68.06 (a)
-- 36
  • 61 (a)
(Anolis carolinensis)
Reptilia -- 36
  • 55 (a)
tropical clawed frog
(Silurana tropicalis)
Amphibia LOC100489468 35
  • 61.86 (n)
  • 62.08 (a)
Species with no ortholog for KRT4:
  • A. gosspyii yeast (Ashbya gossypii)
  • Actinobacteria (Mycobacterium tuberculosis)
  • African clawed frog (Xenopus laevis)
  • African malaria mosquito (Anopheles gambiae)
  • Alicante grape (Vitis vinifera)
  • alpha proteobacteria (Wolbachia pipientis)
  • amoeba (Dictyostelium discoideum)
  • Archea (Pyrococcus horikoshii)
  • baker's yeast (Saccharomyces cerevisiae)
  • barley (Hordeum vulgare)
  • beta proteobacteria (Neisseria meningitidis)
  • bread mold (Neurospora crassa)
  • Chromalveolata (Phytophthora infestans)
  • common water flea (Daphnia pulex)
  • corn (Zea mays)
  • E. coli (Escherichia coli)
  • filamentous fungi (Aspergillus nidulans)
  • Firmicute bacteria (Streptococcus pneumoniae)
  • fission yeast (Schizosaccharomyces pombe)
  • fruit fly (Drosophila melanogaster)
  • green algae (Chlamydomonas reinhardtii)
  • honey bee (Apis mellifera)
  • K. lactis yeast (Kluyveromyces lactis)
  • loblloly pine (Pinus taeda)
  • malaria parasite (Plasmodium falciparum)
  • medicago trunc (Medicago Truncatula)
  • moss (Physcomitrella patens)
  • orangutan (Pongo pygmaeus)
  • pig (Sus scrofa)
  • rainbow trout (Oncorhynchus mykiss)
  • rice (Oryza sativa)
  • rice blast fungus (Magnaporthe grisea)
  • schistosome parasite (Schistosoma mansoni)
  • sea anemone (Nematostella vectensis)
  • sea squirt (Ciona intestinalis)
  • sea squirt (Ciona savignyi)
  • sea urchin (Strongylocentrotus purpuratus)
  • sorghum (Sorghum bicolor)
  • soybean (Glycine max)
  • stem rust fungus (Puccinia graminis)
  • sugarcane (Saccharum officinarum)
  • thale cress (Arabidopsis thaliana)
  • tomato (Lycopersicon esculentum)
  • toxoplasmosis (Toxoplasma gondii)
  • Trichoplax (Trichoplax adhaerens)
  • wheat (Triticum aestivum)
  • worm (Caenorhabditis elegans)
  • zebrafish (Danio rerio)

Evolution for KRT4 Gene

Gene Tree for KRT4 (if available)
Gene Tree for KRT4 (if available)

Paralogs for KRT4 Gene

genes like me logo Genes that share paralogs with KRT4: view

Variants for KRT4 Gene

Polymorphic Variants from UniProtKB/Swiss-Prot for KRT4 Gene

Three alleles of K4 are known: K4A2 (shown here), K4A1 and K4B

Sequence variations from dbSNP and Humsavar for KRT4 Gene

SNP ID Clin Chr 12 pos Sequence Context AA Info Type MAF
rs931479 -- 52,807,629(+) CACCC(C/T)GCCTA intron-variant
rs1552754 -- 52,815,234(+) CCTCC(C/T)GTTGC upstream-variant-2KB
rs1552755 -- 52,815,254(+) GCTGT(A/G)TAACC upstream-variant-2KB
rs1994755 -- 52,806,099(+) AAATA(A/G)GGAGG downstream-variant-500B
rs2035879 untested 52,806,800(+) CTCTG(C/T)CCATG utr-variant-3-prime

Structural Variations from Database of Genomic Variants (DGV) for KRT4 Gene

Variant ID Type Subtype PubMed ID
nsv832416 CNV Loss 17160897
nsv470293 CNV Loss 18288195

Relevant External Links for KRT4 Gene

HapMap Linkage Disequilibrium report
Human Gene Mutation Database (HGMD)

Disorders for KRT4 Gene

(1) OMIM Diseases for KRT4 Gene (123940)


  • White sponge nevus 1 (WSN1) [MIM:193900]: A rare disorder characterized by the presence of soft, white, and spongy plaques in the oral mucosa. The characteristic histopathologic features are epithelial thickening, parakeratosis, and vacuolization of the suprabasal layer of oral epithelial keratinocytes. Less frequently the mucous membranes of the nose, esophagus, genitalia and rectum are involved. {ECO:0000269 PubMed:10652003, ECO:0000269 PubMed:12828738}. Note=The disease is caused by mutations affecting the gene represented in this entry.

(3) University of Copenhagen DISEASES for KRT4 Gene

(11) Novoseek inferred disease relationships for KRT4 Gene

Disease -log(P) Hits PubMed IDs
metaplasia 58.6 3
nevi 51.3 2
carcinoma squamous cell 47.6 8
adenocarcinoma 30.1 5
hyperplasia 27 1
genes like me logo Genes that share disorders with KRT4: view

No data available for Genatlas and External Links for KRT4 Gene

Publications for KRT4 Gene

  1. Allelic variations of human keratins K4 and K5 provide polymorphic markers within the type II keratin gene cluster on chromosome 12. (PMID: 7684424) Wanner R. … Mischke D. (J. Invest. Dermatol. 1993) 3 4 23
  2. A glutamine insertion in the 1A alpha helical domain of the keratin 4 gene in a familial case of white sponge nevus. (PMID: 10652003) Terrinoni A. … Melino G. (J. Invest. Dermatol. 2000) 3 4 23
  3. Transcriptional regulation of the differentiation-linked human K4 promoter is dependent upon esophageal-specific nuclear factors. (PMID: 9727005) Opitz O.G. … Rustgi A.K. (J. Biol. Chem. 1998) 3 23
  4. The surface protein Srr-1 of Streptococcus agalactiae binds human keratin 4 and promotes adherence to epithelial HEp-2 cells. (PMID: 17709412) Samen U. … Borges F. (Infect. Immun. 2007) 3 23
  5. Comparative analysis of the expression of cytokeratins (1, 10, 14, 16, 4), involucrin, filaggrin and e-cadherin in plane warts and epidermodysplasia verruciformis plane wart-type lesions. (PMID: 19515043) Barcelos A.C. … Sotto M.N. (J. Cutan. Pathol. 2009) 3 23

Products for KRT4 Gene

Sources for KRT4 Gene

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