Free for academic non-profit institutions. Other users need a Commercial license

Aliases for GJB4 Gene

Aliases for GJB4 Gene

  • Gap Junction Protein Beta 4 2 3 5
  • Gap Junction Protein, Beta 4, 30.3kDa 2 3
  • Connexin 30.3 2 3
  • Connexin-30.3 3 4
  • CX30.3 3 4
  • Gap Junction Protein, Beta 4 (Connexin 30.3) 2
  • Gap Junction Protein, Beta 4 2
  • EKV 3

External Ids for GJB4 Gene

Previous GeneCards Identifiers for GJB4 Gene

  • GC01U990071
  • GC01P034281
  • GC01P034651
  • GC00M9U0070
  • GC01P034894
  • GC01P034997
  • GC01P034999
  • GC01P035225
  • GC01P033342

Summaries for GJB4 Gene

Entrez Gene Summary for GJB4 Gene

  • This gene encodes a transmembrane connexin protein that is a component of gap junctions. Mutations in this gene have been associated with erythrokeratodermia variabilis, progressive symmetric erythrokeratoderma and hearing impairment. [provided by RefSeq, Dec 2009]

GeneCards Summary for GJB4 Gene

GJB4 (Gap Junction Protein Beta 4) is a Protein Coding gene. Diseases associated with GJB4 include erythrokeratodermia variabilis et progressiva and gjb4-related erythrokeratodermia variabilis. Among its related pathways are Signaling in Gap Junctions and Myometrial Relaxation and Contraction Pathways. An important paralog of this gene is GJC2.

UniProtKB/Swiss-Prot for GJB4 Gene

  • One gap junction consists of a cluster of closely packed pairs of transmembrane channels, the connexons, through which materials of low MW diffuse from one cell to a neighboring cell.

Tocris Summary for GJB4 Gene

  • Gap channels (gap junctions) are specialized cell-cell contacts that provide direct intracellular communication. They allow passive diffusion of molecules up to 1 kDa, including nutrients, metabolites (glucose), ions (K+, Ca2+) and second messengers (IP3, cAMP).

Gene Wiki entry for GJB4 Gene

No data available for PharmGKB "VIP" Summary , fRNAdb sequence ontologies and piRNA Summary for GJB4 Gene

Genomics for GJB4 Gene

Regulatory Elements for GJB4 Gene

Genomic Location for GJB4 Gene

34,759,741 bp from pter
34,763,724 bp from pter
3,984 bases
Plus strand

Genomic View for GJB4 Gene

Genes around GJB4 on UCSC Golden Path with GeneCards custom track

Cytogenetic band:
GJB4 Gene in genomic location: bands according to Ensembl, locations according to GeneLoc (and/or Entrez Gene and/or Ensembl if different)
Genomic Location for GJB4 Gene
GeneLoc Logo Genomic Neighborhood Exon StructureGene Density

RefSeq DNA sequence for GJB4 Gene

Proteins for GJB4 Gene

  • Protein details for GJB4 Gene (UniProtKB/Swiss-Prot)

    Protein Symbol:
    Recommended name:
    Gap junction beta-4 protein
    Protein Accession:
    Secondary Accessions:
    • B3KQ82

    Protein attributes for GJB4 Gene

    266 amino acids
    Molecular mass:
    30419 Da
    Quaternary structure:
    • A connexon is composed of a hexamer of connexins.

neXtProt entry for GJB4 Gene

Proteomics data for GJB4 Gene at MOPED

Post-translational modifications for GJB4 Gene

  • Modification sites at PhosphoSitePlus
  • Modification sites at neXtProt

Other Protein References for GJB4 Gene

ENSEMBL proteins:
REFSEQ proteins:

No data available for DME Specific Peptides for GJB4 Gene

Domains & Families for GJB4 Gene

Gene Families for GJB4 Gene

Suggested Antigen Peptide Sequences for GJB4 Gene

GenScript: Design optimal peptide antigens:

Graphical View of Domain Structure for InterPro Entry



  • Belongs to the connexin family. Beta-type (group I) subfamily.
  • Belongs to the connexin family. Beta-type (group I) subfamily.
genes like me logo Genes that share domains with GJB4: view

Function for GJB4 Gene

Molecular function for GJB4 Gene

UniProtKB/Swiss-Prot Function:
One gap junction consists of a cluster of closely packed pairs of transmembrane channels, the connexons, through which materials of low MW diffuse from one cell to a neighboring cell.

Phenotypes for GJB4 Gene

MGI mutant phenotypes for GJB4:
inferred from 1 alleles
GenomeRNAi human phenotypes for GJB4:
genes like me logo Genes that share phenotypes with GJB4: view

Human Phenotype Ontology for GJB4 Gene

HPO Id HPO Name Alternative Ids Definition Synonyms

Animal Models for GJB4 Gene

MGI Knock Outs for GJB4:

Animal Model Products

miRNA for GJB4 Gene

miRTarBase miRNAs that target GJB4

No data available for Enzyme Numbers (IUBMB) , Gene Ontology (GO) - Molecular Function , Transcription Factor Targets and HOMER Transcription for GJB4 Gene

Localization for GJB4 Gene

Subcellular locations from UniProtKB/Swiss-Prot for GJB4 Gene

Cell membrane; Multi-pass membrane protein. Cell junction, gap junction.

Subcellular locations from

Jensen Localization Image for GJB4 Gene COMPARTMENTS Subcellular localization image for GJB4 gene
Compartment Confidence
plasma membrane 5
extracellular 1
lysosome 1
vacuole 1

Gene Ontology (GO) - Cellular Components for GJB4 Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0005922 connexon complex IEA --
genes like me logo Genes that share ontologies with GJB4: view

Pathways & Interactions for GJB4 Gene

genes like me logo Genes that share pathways with GJB4: view

Pathways by source for GJB4 Gene

Interacting Proteins for GJB4 Gene

Gene Ontology (GO) - Biological Process for GJB4 Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0007154 cell communication IEA --
genes like me logo Genes that share ontologies with GJB4: view

No data available for SIGNOR curated interactions for GJB4 Gene

Drugs & Compounds for GJB4 Gene

(9) Drugs for GJB4 Gene - From: IUPHAR, DGIdb, and Tocris

Name Status Disease Links Group Role Mechanism of Action Clinical Trials
Carbenoxolone Experimental Pharma Inhibitor 0
Flufenamic acid Experimental Pharma Channel blocker Activates TRPC6; NSAID 0
Ca<sup>2+</sup> Pharma Activator 0
octanol Pharma Inhibitor 0
10Panx Pharma Panx-1 mimetic inhibitor, Panx-1 mimetic inhibitory peptide; blocks pannexin-1 gap junctions 0

(5) Tocris Compounds for GJB4 Gene

Compound Action Cas Number
10Panx Panx-1 mimetic inhibitory peptide; blocks pannexin-1 gap junctions 955091-53-9
Carbenoxolone disodium Gap junction blocker. Also inhibitor of 11 beta-hydroxysteroid dehydrogenase 7421-40-1
Gap 26 Gap junction blocker; inhibits smooth muscle contraction and IP3-mediated ATP release 197250-15-0
Gap 27 Selective gap junction blocker 198284-64-9
Scrambled 10Panx Scrambled version of 10Panx (Cat. No. 3348), Panx-1 mimetic inhibitory peptide 1315378-72-3
genes like me logo Genes that share compounds with GJB4: view

Transcripts for GJB4 Gene

mRNA/cDNA for GJB4 Gene

(2) REFSEQ mRNAs :
(2) Additional mRNA sequences :
(6) Selected AceView cDNA sequences:
(1) Ensembl transcripts including schematic representations, and UCSC links where relevant :

Unigene Clusters for GJB4 Gene

Gap junction protein, beta 4, 30.3kDa:
Representative Sequences:

Alternative Splicing Database (ASD) splice patterns (SP) for GJB4 Gene

No ASD Table

Relevant External Links for GJB4 Gene

GeneLoc Exon Structure for
ECgene alternative splicing isoforms for

Expression for GJB4 Gene

mRNA expression in normal human tissues for GJB4 Gene

mRNA expression in embryonic tissues and stem cells from LifeMap Discovery

mRNA differential expression in normal tissues according to GTEx for GJB4 Gene

This gene is overexpressed in Skin - Sun Exposed (Lower leg) (x23.1) and Skin - Not Sun Exposed (Suprapubic) (x21.8).

SOURCE GeneReport for Unigene cluster for GJB4 Gene Hs.351203

genes like me logo Genes that share expression patterns with GJB4: view

Primer Products

In Situ Assay Products

No data available for Protein differential expression in normal tissues , Protein expression , mRNA Expression by UniProt/SwissProt and Protein tissue co-expression partners for GJB4 Gene

Orthologs for GJB4 Gene

This gene was present in the common ancestor of chordates.

Orthologs for GJB4 Gene

Organism Taxonomy Gene Similarity Type Details
(Bos Taurus)
Mammalia GJB4 35
  • 85.84 (n)
  • 82.71 (a)
GJB4 36
  • 83 (a)
(Canis familiaris)
Mammalia GJB4 35
  • 86.72 (n)
  • 88.35 (a)
GJB4 36
  • 88 (a)
(Mus musculus)
Mammalia Gjb4 35
  • 83.21 (n)
  • 86.47 (a)
Gjb4 16
Gjb4 36
  • 86 (a)
(Pan troglodytes)
Mammalia GJB4 35
  • 98.5 (n)
  • 97.74 (a)
GJB4 36
  • 98 (a)
(Rattus norvegicus)
Mammalia Gjb4 35
  • 84.65 (n)
  • 86.79 (a)
(Monodelphis domestica)
Mammalia GJB4 36
  • 72 (a)
(Ornithorhynchus anatinus)
Mammalia GJB4 36
  • 68 (a)
tropical clawed frog
(Silurana tropicalis)
Amphibia LOC100486331 35
  • 64.19 (n)
  • 64.19 (a)
(Danio rerio)
Actinopterygii cx34.4 35
  • 63.72 (n)
  • 63.05 (a)
cx28.6 36
  • 55 (a)
cx30.9 36
  • 50 (a)
cx34.4 36
  • 53 (a)
Species with no ortholog for GJB4:
  • 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)
  • chicken (Gallus gallus)
  • 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)
  • lizard (Anolis carolinensis)
  • 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)

Evolution for GJB4 Gene

Gene Tree for GJB4 (if available)
Gene Tree for GJB4 (if available)

Paralogs for GJB4 Gene

Paralogs for GJB4 Gene

(17) SIMAP similar genes for GJB4 Gene using alignment to 1 proteins:

genes like me logo Genes that share paralogs with GJB4: view

Variants for GJB4 Gene

Sequence variations from dbSNP and Humsavar for GJB4 Gene

SNP ID Clin Chr 01 pos Sequence Context AA Info Type
VAR_010206 Erythrokeratodermia variabilis (EKV)
VAR_015088 -
VAR_015089 -
VAR_015090 -
VAR_015091 -

Structural Variations from Database of Genomic Variants (DGV) for GJB4 Gene

Variant ID Type Subtype PubMed ID
nsv870700 CNV Loss 21882294

Variation tolerance for GJB4 Gene

Residual Variation Intolerance Score: 98.1% of all genes are more intolerant (likely to be disease-causing)
Gene Damage Index Score: 7.85; 83.61% of all genes are more intolerant (likely to be disease-causing)

Relevant External Links for GJB4 Gene

HapMap Linkage Disequilibrium report
Human Gene Mutation Database (HGMD)

No data available for Polymorphic Variants from UniProtKB/Swiss-Prot for GJB4 Gene

Disorders for GJB4 Gene

MalaCards: The human disease database

(10) MalaCards diseases for GJB4 Gene - From: OMIM, ClinVar, GeneTests, Orphanet, Swiss-Prot, DISEASES, Novoseek, and GeneCards

Disorder Aliases PubMed IDs
erythrokeratodermia variabilis et progressiva
  • erythrokeratodermia variabilis with erythema gyratum repens
gjb4-related erythrokeratodermia variabilis
  • gjb4-related ekv
hypotrichosis-deafness syndrome
kid syndrome
  • keratitis-ichthyosis-deafness syndrome
- elite association - COSMIC cancer census association via MalaCards
Search GJB4 in MalaCards View complete list of genes associated with diseases


  • Erythrokeratodermia variabilis (EKV) [MIM:133200]: A genodermatosis characterized by the appearance of two independent skin lesions: transient figurate erythematous patches and hyperkeratosis that is usually localized but occasionally occurs in its generalized form. Clinical presentation varies significantly within a family and from one family to another. Palmoplantar keratoderma is present in around 50% of cases. {ECO:0000269 PubMed:11017804}. Note=The disease is caused by mutations affecting the gene represented in this entry.

Relevant External Links for GJB4

Genetic Association Database (GAD)
Human Genome Epidemiology (HuGE) Navigator
Atlas of Genetics and Cytogenetics in Oncology and Haematology:
genes like me logo Genes that share disorders with GJB4: view

No data available for Genatlas for GJB4 Gene

Publications for GJB4 Gene

  1. A common frameshift mutation and other variants in GJB4 (connexin 30.3): analysis of hearing impairment families. (PMID: 11933201) Lopez-Bigas N. … Estivill X. (Hum. Mutat. 2002) 3 4 23 67
  2. The missense mutation G12D in connexin30.3 can cause both erythrokeratodermia variabilis of Mendes da Costa and progressive symmetric erythrokeratodermia of Gottron. (PMID: 19291775) van Steensel M.A. … van Geel M. (Am. J. Med. Genet. A 2009) 3 23
  3. Clinical and genetic heterogeneity of erythrokeratoderma variabilis. (PMID: 16297190) Common J.E. … Kelsell D.P. (J. Invest. Dermatol. 2005) 3 23
  4. Genetic heterogeneity in erythrokeratodermia variabilis: novel mutations in the connexin gene GJB4 (Cx30.3) and genotype-phenotype correlations. (PMID: 12648223) Richard G. … Uitto J. (J. Invest. Dermatol. 2003) 3 23
  5. Molecular interaction of connexin 30.3 and connexin 31 suggests a dominant-negative mechanism associated with erythrokeratodermia variabilis. (PMID: 14583444) Plantard L. … Hohl D. (Hum. Mol. Genet. 2003) 3 23

Products for GJB4 Gene

Sources for GJB4 Gene

Back to Top