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Aliases for CRB1 Gene

Aliases for CRB1 Gene

  • Crumbs 1, Cell Polarity Complex Component 2 3
  • Crumbs Family Member 1, Photoreceptor Morphogenesis Associated 2 3 5
  • Crumbs (Drosophila) Homolog 1 2
  • Crumbs Homolog 1 (Drosophila) 2
  • LCA8 3
  • RP12 3

External Ids for CRB1 Gene

Previous HGNC Symbols for CRB1 Gene

  • RP12

Previous GeneCards Identifiers for CRB1 Gene

  • GC01P194964
  • GC01P192695
  • GC01P193703
  • GC01P194525
  • GC01P193969
  • GC01P195504
  • GC01P197237
  • GC01P168395

Summaries for CRB1 Gene

Entrez Gene Summary for CRB1 Gene

  • This gene encodes a protein which is similar to the Drosophila crumbs protein and localizes to the inner segment of mammalian photoreceptors. In Drosophila crumbs localizes to the stalk of the fly photoreceptor and may be a component of the molecular scaffold that controls proper development of polarity in the eye. Mutations in this gene are associated with a severe form of retinitis pigmentosa, RP12, and with Leber congenital amaurosis. Alternate splicing results in multiple transcript variants, some protein coding and some non-protein coding.[provided by RefSeq, Apr 2012]

GeneCards Summary for CRB1 Gene

CRB1 (Crumbs 1, Cell Polarity Complex Component) is a Protein Coding gene. Diseases associated with CRB1 include Leber Congenital Amaurosis 8 and Retinitis Pigmentosa-12, Autosomal Recessive. Among its related pathways are Sertoli-Sertoli Cell Junction Dynamics and Hippo signaling pathway. GO annotations related to this gene include calcium ion binding. An important paralog of this gene is JAG1.

UniProtKB/Swiss-Prot for CRB1 Gene

  • Plays a role in photoreceptor morphogenesis in the retina. May maintain cell polarization and adhesion.

Gene Wiki entry for CRB1 Gene

No data available for Tocris Summary , PharmGKB "VIP" Summary , fRNAdb sequence ontologies and piRNA Summary for CRB1 Gene

Genomics for CRB1 Gene

Regulatory Elements for CRB1 Gene

Enhancers for CRB1 Gene
GeneHancer Identifier Score Enhancer Sources TSS distance (kb) Number of Genes Away Size (kb) Transcription Factor Binding Sites within enhancer Other Gene Targets for Enhancer

Enhancers around CRB1 on UCSC Golden Path with GeneCards custom track

Promoters for CRB1 Gene
Ensembl Regulatory Elements (ENSRs) TSS Distance (bp) Size (bp) Binding Sites for Transcription Factors within promoters

ENSRs around CRB1 on UCSC Golden Path with GeneCards custom track

Genomic Location for CRB1 Gene

197,201,462 bp from pter
197,478,455 bp from pter
276,994 bases
Plus strand

Genomic View for CRB1 Gene

Genes around CRB1 on UCSC Golden Path with GeneCards custom track

Cytogenetic band:
CRB1 Gene in genomic location: bands according to Ensembl, locations according to GeneLoc (and/or Entrez Gene and/or Ensembl if different)
Genomic Location for CRB1 Gene
GeneLoc Logo Genomic Neighborhood Exon StructureGene Density

RefSeq DNA sequence for CRB1 Gene

Proteins for CRB1 Gene

  • Protein details for CRB1 Gene (UniProtKB/Swiss-Prot)

    Protein Symbol:
    Recommended name:
    Protein crumbs homolog 1
    Protein Accession:
    Secondary Accessions:
    • A2A308
    • B7Z5T2
    • B9EG71
    • Q5K3A6
    • Q5TC28
    • Q5VUT1
    • Q6N027
    • Q8WWY0
    • Q8WWY1

    Protein attributes for CRB1 Gene

    1406 amino acids
    Molecular mass:
    154183 Da
    Quaternary structure:
    • Forms a complex with MPDZ (By similarity). Forms a complex with MPP4 and MPP5.
    • Sequence=CAE45845.1; Type=Erroneous termination; Positions=567; Note=Translated as Trp.; Evidence={ECO:0000305}; Sequence=CAI16644.1; Type=Erroneous gene model prediction; Evidence={ECO:0000305};

    Three dimensional structures from OCA and Proteopedia for CRB1 Gene

    Alternative splice isoforms for CRB1 Gene


neXtProt entry for CRB1 Gene

Proteomics data for CRB1 Gene at MOPED

Post-translational modifications for CRB1 Gene

  • Extensively glycosylated.
  • Glycosylation at Asn 30, Asn 41, Asn 42, Asn 215, Asn 287, Asn 313, Asn 322, Asn 418, Asn 427, Asn 453, Asn 550, Asn 561, Asn 657, Asn 757, Asn 871, Asn 880, Asn 968, Asn 975, Asn 1000, Asn 1190, Asn 1243, Asn 1265, and Asn 1273
  • Modification sites at PhosphoSitePlus

Antibody Products

  • Santa Cruz Biotechnology (SCBT) Antibodies for CRB1

No data available for DME Specific Peptides for CRB1 Gene

Domains & Families for CRB1 Gene

Gene Families for CRB1 Gene

Graphical View of Domain Structure for InterPro Entry



  • Contains 19 EGF-like domains.
  • Belongs to the Crumbs protein family.
  • Contains 19 EGF-like domains.
  • Contains 3 laminin G-like domains.
  • Belongs to the Crumbs protein family.
genes like me logo Genes that share domains with CRB1: view

Function for CRB1 Gene

Molecular function for CRB1 Gene

GENATLAS Biochemistry:
Drosophila crumbs homolog 1,expressed in the neural retina,fetal and adult brain,not expressed in RPE/choroid,potentially involved in the organization or polarity of retinal cells
UniProtKB/Swiss-Prot Function:
Plays a role in photoreceptor morphogenesis in the retina. May maintain cell polarization and adhesion.
genes like me logo Genes that share phenotypes with CRB1: view

Human Phenotype Ontology for CRB1 Gene

HPO Id HPO Name Alternative Ids Definition Synonyms

Animal Models for CRB1 Gene

MGI Knock Outs for CRB1:

Animal Model Products

No data available for Enzyme Numbers (IUBMB) , Gene Ontology (GO) - Molecular Function , Transcription Factor Targets and HOMER Transcription for CRB1 Gene

Localization for CRB1 Gene

Subcellular locations from UniProtKB/Swiss-Prot for CRB1 Gene

Isoform 1: Apical cell membrane; Single-pass type I membrane protein. Note=Distributed at the apical membrane of all retinal epithelial cells. Located in the apical membrane of the adherens junction in outer limiting membrane (OLM) of the retina.
Isoform 2: Secreted.

Subcellular locations from

Jensen Localization Image for CRB1 Gene COMPARTMENTS Subcellular localization image for CRB1 gene
Compartment Confidence
extracellular 5
plasma membrane 5
cytoskeleton 1
endoplasmic reticulum 1
golgi apparatus 1
peroxisome 1

Gene Ontology (GO) - Cellular Components for CRB1 Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0016324 apical plasma membrane IEA --
genes like me logo Genes that share ontologies with CRB1: view

Pathways & Interactions for CRB1 Gene

genes like me logo Genes that share pathways with CRB1: view

Pathways by source for CRB1 Gene

1 KEGG pathway for CRB1 Gene
1 Qiagen pathway for CRB1 Gene

Gene Ontology (GO) - Biological Process for CRB1 Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0007163 establishment or maintenance of cell polarity TAS 10508521
GO:0042462 eye photoreceptor cell development IEA --
genes like me logo Genes that share ontologies with CRB1: view

No data available for SIGNOR curated interactions for CRB1 Gene

Drugs & Compounds for CRB1 Gene

(1) Additional Compounds for CRB1 Gene - From: Novoseek

Name Synonyms Role CAS Number PubChem IDs PubMed IDs
genes like me logo Genes that share compounds with CRB1: view

Transcripts for CRB1 Gene

Unigene Clusters for CRB1 Gene

Crumbs homolog 1 (Drosophila):
Representative Sequences:

Alternative Splicing Database (ASD) splice patterns (SP) for CRB1 Gene

ExUns: 1a · 1b ^ 2 ^ 3 ^ 4 ^ 5a · 5b ^ 6 ^ 7 ^ 8a · 8b ^ 9 ^ 10 ^ 11 ^ 12a · 12b ^ 13 ^ 14a · 14b ^ 15a · 15b · 15c
SP1: - - - - - - -
SP2: - - - -
SP3: - - - - - - - - -
SP6: - -
SP7: -
SP8: -

Relevant External Links for CRB1 Gene

GeneLoc Exon Structure for
ECgene alternative splicing isoforms for

Expression for CRB1 Gene

mRNA expression in normal human tissues for CRB1 Gene

mRNA expression in embryonic tissues and stem cells from LifeMap Discovery

mRNA differential expression in normal tissues according to GTEx for CRB1 Gene

This gene is overexpressed in Brain - Cerebellum (x5.1), Brain - Caudate (basal ganglia) (x5.0), Brain - Cerebellar Hemisphere (x4.9), Brain - Amygdala (x4.7), and Brain - Nucleus accumbens (basal ganglia) (x4.4).

Protein differential expression in normal tissues from HIPED for CRB1 Gene

This gene is overexpressed in Urine (37.3), Serum (18.7), and Plasma (9.2).

Integrated Proteomics: protein expression in normal tissues and cell lines from ProteomicsDB, PaxDb, and MOPED for CRB1 Gene

SOURCE GeneReport for Unigene cluster for CRB1 Gene Hs.126135

mRNA Expression by UniProt/SwissProt for CRB1 Gene

Tissue specificity: Preferential expression in retina, also expressed in brain, testis, fetal brain and fetal eye.
genes like me logo Genes that share expression patterns with CRB1: view

Protein tissue co-expression partners for CRB1 Gene

Primer Products

Orthologs for CRB1 Gene

This gene was present in the common ancestor of animals.

Orthologs for CRB1 Gene

Organism Taxonomy Gene Similarity Type Details
(Bos Taurus)
Mammalia CRB1 35
  • 77.12 (n)
  • 71.76 (a)
CRB1 36
  • 72 (a)
(Canis familiaris)
Mammalia CRB1 35
  • 86.69 (n)
  • 81.99 (a)
CRB1 36
  • 81 (a)
(Mus musculus)
Mammalia Crb1 35
  • 82.33 (n)
  • 76.23 (a)
Crb1 16
Crb1 36
  • 76 (a)
(Pan troglodytes)
Mammalia CRB1 35
  • 99.29 (n)
  • 98.72 (a)
CRB1 36
  • 99 (a)
(Rattus norvegicus)
Mammalia Crb1 35
  • 81.14 (n)
  • 74.95 (a)
(Monodelphis domestica)
Mammalia CRB1 36
  • 68 (a)
(Ornithorhynchus anatinus)
Mammalia CRB1 36
  • 67 (a)
(Gallus gallus)
Aves CRB1 35
  • 68.73 (n)
  • 63.4 (a)
CRB1 36
  • 64 (a)
(Anolis carolinensis)
Reptilia CRB1 36
  • 61 (a)
tropical clawed frog
(Silurana tropicalis)
Amphibia crb1 35
  • 56.91 (n)
  • 48.93 (a)
(Danio rerio)
Actinopterygii crb1 35
  • 52.91 (n)
  • 45.71 (a)
crb1 36
  • 43 (a)
fruit fly
(Drosophila melanogaster)
Insecta CG15388 37
  • 43 (a)
crb 37
  • 30 (a)
eys 36
  • 14 (a)
(Caenorhabditis elegans)
Secernentea crb-1 37
  • 26 (a)
W02C12.1 37
  • 37 (a)
Y69H2.12 37
  • 28 (a)
sea squirt
(Ciona savignyi)
Ascidiacea -- 36
  • 42 (a)
Species with no ortholog for CRB1:
  • 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)
  • 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 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)

Evolution for CRB1 Gene

Gene Tree for CRB1 (if available)
Gene Tree for CRB1 (if available)

Paralogs for CRB1 Gene

Paralogs for CRB1 Gene

(9) SIMAP similar genes for CRB1 Gene using alignment to 5 proteins:

genes like me logo Genes that share paralogs with CRB1: view

Variants for CRB1 Gene

Sequence variations from dbSNP and Humsavar for CRB1 Gene

SNP ID Clin Chr 01 pos Sequence Context AA Info Type
VAR_011641 Retinitis pigmentosa 12 (RP12)
VAR_011642 Retinitis pigmentosa 12 (RP12)
rs28939720 Leber congenital amaurosis 8 (LCA8), Retinitis pigmentosa 12 (RP12) 197,427,559(+) CCGAA(C/T)GCTTC intron-variant, nc-transcript-variant, reference, missense
VAR_011644 Leber congenital amaurosis 8 (LCA8)
VAR_011644 Retinitis pigmentosa 12 (RP12)

Structural Variations from Database of Genomic Variants (DGV) for CRB1 Gene

Variant ID Type Subtype PubMed ID
nsv528460 CNV Gain 19592680
esv2669387 CNV Deletion 23128226

Variation tolerance for CRB1 Gene

Residual Variation Intolerance Score: 14.6% of all genes are more intolerant (likely to be disease-causing)
Gene Damage Index Score: 2.56; 44.48% of all genes are more intolerant (likely to be disease-causing)

Relevant External Links for CRB1 Gene

Human Gene Mutation Database (HGMD)

No data available for Polymorphic Variants from UniProtKB/Swiss-Prot for CRB1 Gene

Disorders for CRB1 Gene

MalaCards: The human disease database

(19) MalaCards diseases for CRB1 Gene - From: OMIM, ClinVar, GeneTests, Orphanet, Swiss-Prot, DISEASES, Novoseek, and GeneCards

- elite association - COSMIC cancer census association via MalaCards
Search CRB1 in MalaCards View complete list of genes associated with diseases


  • Leber congenital amaurosis 8 (LCA8) [MIM:613835]: A severe dystrophy of the retina, typically becoming evident in the first years of life. Visual function is usually poor and often accompanied by nystagmus, sluggish or near-absent pupillary responses, photophobia, high hyperopia and keratoconus. {ECO:0000269 PubMed:11231775, ECO:0000269 PubMed:11389483, ECO:0000269 PubMed:12567265, ECO:0000269 PubMed:12573663, ECO:0000269 PubMed:12700176, ECO:0000269 PubMed:15024725, ECO:0000269 PubMed:15691574, ECO:0000269 PubMed:16205573, ECO:0000269 PubMed:16936081, ECO:0000269 PubMed:17128490, ECO:0000269 PubMed:17438615, ECO:0000269 PubMed:17724218, ECO:0000269 PubMed:18055821, ECO:0000269 PubMed:18682808, ECO:0000269 PubMed:20108431, ECO:0000269 PubMed:20956273, ECO:0000269 PubMed:21602930}. Note=The disease is caused by mutations affecting the gene represented in this entry.
  • Note=CRB1 mutations have been found in various retinal dystrophies, chronic and disabling disorders of visual function. They predominantly involve the posterior portion of the ocular fundus, due to degeneration in the sensory layer of the retina, retinal pigment epithelium, Bruch membrane, choroid, or a combination of these tissues. Onset of inherited retinal dystrophies is painless, bilateral and typically progressive. Most people experience gradual peripheral vision loss or tunnel vision, and difficulties with poor illumination and night vision. Central vision is usually unaffected, so the person may still be able to read. However, it can also deteriorate to cause total blindness. Examples of retinal dystrophies are retinitis pigmentosa, Leber congenital amaurosis, cone-rod dystrophy among others. {ECO:0000269 PubMed:20683928, ECO:0000269 PubMed:22065545}.
  • Pigmented paravenous chorioretinal atrophy (PPCRA) [MIM:172870]: Unusual retinal degeneration characterized by accumulation of pigmentation along retinal veins. PPCRA is dominantly inherited, but exhibited variable expressivity. Males are more likely to exhibit a severe phenotype, whereas females may remain virtually asymptomatic even in later years. The PPCRA phenotype is associated with a mutation in CRB1 gene which is likely to affect the structure of the CRB1 protein. {ECO:0000269 PubMed:15623792}. Note=The disease is caused by mutations affecting the gene represented in this entry.
  • Retinitis pigmentosa 12 (RP12) [MIM:600105]: A retinal dystrophy belonging to the group of pigmentary retinopathies. Retinitis pigmentosa is characterized by retinal pigment deposits visible on fundus examination and primary loss of rod photoreceptor cells followed by secondary loss of cone photoreceptors. Patients typically have night vision blindness and loss of midperipheral visual field. As their condition progresses, they lose their far peripheral visual field and eventually central vision as well. RP12 is an autosomal recessive, severe form often manifesting in early childhood. Patients experiment progressive visual field loss with severe visual impairment before the age of twenty. Some patients have a preserved paraarteriolar retinal pigment epithelium (PPRPE) and hypermetropia. {ECO:0000269 PubMed:10508521, ECO:0000269 PubMed:11389483, ECO:0000269 PubMed:11559858, ECO:0000269 PubMed:12573663, ECO:0000269 PubMed:12843338, ECO:0000269 PubMed:15459956, ECO:0000269 PubMed:19140180, ECO:0000269 PubMed:19956407, ECO:0000269 PubMed:20591486, ECO:0000269 PubMed:20956273, ECO:0000269 PubMed:21987686, ECO:0000269 PubMed:22065545, ECO:0000269 PubMed:22128245, ECO:0000269 PubMed:22334370}. Note=The disease is caused by mutations affecting the gene represented in this entry.

Relevant External Links for CRB1

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 CRB1: view

No data available for Genatlas for CRB1 Gene

Publications for CRB1 Gene

  1. Mutations in the CRB1 gene cause Leber congenital amaurosis. (PMID: 11231775) Lotery A.J. … Stone E.M. (Arch. Ophthalmol. 2001) 3 4 23 48 67
  2. CRB1 gene mutations are associated with keratoconus in patients with leber congenital amaurosis. (PMID: 19407021) McMahon T.T. … Malicki J. (Invest. Ophthalmol. Vis. Sci. 2009) 3 23
  3. Molecular analysis of ABCA4 and CRB1 genes in a Spanish family segregating both Stargardt disease and autosomal recessive retinitis pigmentosa. (PMID: 18334942) Riveiro-Alvarez R. … Ayuso C. (Mol. Vis. 2008) 3 23
  4. Early noninvasive prenatal detection of a fetal CRB1 mutation causing Leber congenital amaurosis. (PMID: 18682814) Bustamante-Aragones A. … Ramos C. (Mol. Vis. 2008) 3 23
  5. Clinical and molecular genetics of Leber's congenital amaurosis: a multicenter study of Italian patients. (PMID: 17724218) Simonelli F. … Banfi S. (Invest. Ophthalmol. Vis. Sci. 2007) 3 23

Products for CRB1 Gene

Sources for CRB1 Gene