CRB1

Crumbs homolog 1 is a protein that in humans is encoded by the CRB1 gene.[5][6][7]

CRB1
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 4UU5
Identifiers
Aliases	CRB1, LCA8, RP12, crumbs 1, cell polarity complex component, crumbs cell polarity complex component 1
External IDs	OMIM: 604210 MGI: 2136343 HomoloGene: 8092 GeneCards: CRB1
Gene location (Human) Chr. Chromosome 1 (human)[1] Band 1q31.3 Start 197,268,204 bp[1] End 197,478,455 bp[1]
Gene location (Mouse) Chr. Chromosome 1 (mouse)[2] Band 1 E4|1 60.87 cM Start 139,197,056 bp[2] End 139,377,100 bp[2]
RNA expression pattern More reference expression data
Gene ontology Molecular function • calcium ion binding • GO:0001948 protein binding Cellular component • integral component of membrane • extracellular region • microvilli • cell membrane • apical plasma membrane • membrane • photoreceptor inner segment • macromolecular complex Biological process • establishment or maintenance of cell polarity • cell-cell signaling • membrane organization • plasma membrane organization • eye photoreceptor cell development • heterophilic cell-cell adhesion via plasma membrane cell adhesion molecules • establishment or maintenance of epithelial cell apical/basal polarity Sources:Amigo / QuickGO
Orthologs
Species	Human	Mouse
Entrez	23418	170788
Ensembl	ENSG00000134376	ENSMUSG00000063681
UniProt	P82279	Q8VHS2
RefSeq (mRNA)	NM_001193640 NM_001257965 NM_001257966 NM_012076 NM_201253	NM_133239
RefSeq (protein)	NP_001180569 NP_001244894 NP_001244895 NP_957705	NP_573502
Location (UCSC)	Chr 1: 197.27 – 197.48 Mb	Chr 1: 139.2 – 139.38 Mb
PubMed search	[3]	[4]
Wikidata
View/Edit Human View/Edit Mouse

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. Alternatively spliced transcript variants have been observed but their full-length nature has yet to be determined.[7] One small study suggests that mutations in this gene are associated with keratoconus in patients that already have Leber's congenital amaurosis.[8]

References

1. GRCh38: Ensembl release 89: ENSG00000134376 - Ensembl, May 2017
2. GRCm38: Ensembl release 89: ENSMUSG00000063681 - Ensembl, May 2017
3. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
4. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
5. den Hollander AI, van Driel MA, de Kok YJ, van de Pol DJ, Hoyng CB, Brunner HG, Deutman AF, Cremers FP (Jul 1999). "Isolation and mapping of novel candidate genes for retinal disorders using suppression subtractive hybridization". Genomics. 58 (3): 240–9. doi:10.1006/geno.1999.5823. PMID 10373321.
6. den Hollander AI, ten Brink JB, de Kok YJ, van Soest S, van den Born LI, van Driel MA, van de Pol DJ, Payne AM, Bhattacharya SS, Kellner U, Hoyng CB, Westerveld A, Brunner HG, Bleeker-Wagemakers EM, Deutman AF, Heckenlively JR, Cremers FP, Bergen AA (Oct 1999). "Mutations in a human homologue of Drosophila crumbs cause retinitis pigmentosa (RP12)". Nat Genet. 23 (2): 217–21. doi:10.1038/13848. PMID 10508521.
7. "Entrez Gene: CRB1 crumbs homolog 1 (Drosophila)".
8. McMahon TT, Kim LS, Fishman GA, Stone EM, Zhao XC, Yee R, Malicki J (April 2009). "CRB1Gene Mutations Are Associated with Keratoconus in Patients with Leber Congenital Amaurosis". Invest. Ophthalmol. Vis. Sci. 50 (7): 3185–7. doi:10.1167/iovs.08-2886. PMID 19407021.

External links

• GeneReviews/NIH/NCBI/UW entry on Retinitis Pigmentosa Overview
• Human CRB1 genome location and CRB1 gene details page in the UCSC Genome Browser.

Further reading

• den Hollander AI, Davis J, van der Velde-Visser SD, et al. (2005). "CRB1 mutation spectrum in inherited retinal dystrophies". Hum. Mutat. 24 (5): 355–69. doi:10.1002/humu.20093. PMID 15459956.
• van Soest S, Ingeborgh van den Born L, Gal A, et al. (1995). "Assignment of a gene for autosomal recessive retinitis pigmentosa (RP12) to chromosome 1q31-q32.1 in an inbred and genetically heterogeneous disease population". Genomics. 22 (3): 499–504. doi:10.1006/geno.1994.1422. PMID 8001962.
• van Soest S, te Nijenhuis S, van den Born LI, et al. (1996). "Fine mapping of the autosomal recessive retinitis pigmentosa locus (RP12) on chromosome 1q; exclusion of the phosducin gene (PDC)". Cytogenet. Cell Genet. 73 (1–2): 81–5. doi:10.1159/000134313. PMID 8646891.
• Lotery AJ, Jacobson SG, Fishman GA, et al. (2001). "Mutations in the CRB1 gene cause Leber congenital amaurosis". Arch. Ophthalmol. 119 (3): 415–20. doi:10.1001/archopht.119.3.415. PMID 11231775.
• den Hollander AI, Heckenlively JR, van den Born LI, et al. (2001). "Leber Congenital Amaurosis and Retinitis Pigmentosa with Coats-like Exudative Vasculopathy Are Associated with Mutations in the Crumbs Homologue 1 (CRB1) Gene". Am. J. Hum. Genet. 69 (1): 198–203. doi:10.1086/321263. PMC 1226034. PMID 11389483.
• Lotery AJ, Malik A, Shami SA, et al. (2001). "CRB1 mutations may result in retinitis pigmentosa without para-arteriolar RPE preservation". Ophthalmic Genet. 22 (3): 163–9. doi:10.1076/opge.22.3.163.2222. PMID 11559858.
• den Hollander AI, Johnson K, de Kok YJ, et al. (2002). "CRB1 has a cytoplasmic domain that is functionally conserved between human and Drosophila". Hum. Mol. Genet. 10 (24): 2767–73. doi:10.1093/hmg/10.24.2767. PMID 11734541.
• Izaddoost S, Nam SC, Bhat MA, et al. (2002). "Drosophila Crumbs is a positional cue in photoreceptor adherens junctions and rhabdomeres". Nature. 416 (6877): 178–83. doi:10.1038/nature720. PMID 11850624.
• Roh MH, Makarova O, Liu CJ, et al. (2002). "The Maguk protein, Pals1, functions as an adapter, linking mammalian homologues of Crumbs and Discs Lost". J. Cell Biol. 157 (1): 161–72. doi:10.1083/jcb.200109010. PMC 2173254. PMID 11927608.
• Gerber S, Perrault I, Hanein S, et al. (2003). "A novel mutation disrupting the cytoplasmic domain of CRB1 in a large consanguineous family of Palestinian origin affected with Leber congenital amaurosis". Ophthalmic Genet. 23 (4): 225–35. doi:10.1076/opge.23.4.225.13879. PMID 12567265.
• Khaliq S, Abid A, Hameed A, et al. (2003). "Mutation screening of Pakistani families with congenital eye disorders". Exp. Eye Res. 76 (3): 343–8. doi:10.1016/S0014-4835(02)00304-4. PMID 12573663.
• Jacobson SG, Cideciyan AV, Aleman TS, et al. (2003). "Crumbs homolog 1 (CRB1) mutations result in a thick human retina with abnormal lamination". Hum. Mol. Genet. 12 (9): 1073–8. doi:10.1093/hmg/ddg117. PMID 12700176.
• Bernal S, Calaf M, Garcia-Hoyos M, et al. (2003). "Study of the involvement of the RGR, CRPB1, and CRB1 genes in the pathogenesis of autosomal recessive retinitis pigmentosa". J. Med. Genet. 40 (7): e89. doi:10.1136/jmg.40.7.e89. PMC 1735523. PMID 12843338.
• Hanein S, Perrault I, Gerber S, et al. (2004). "Leber congenital amaurosis: comprehensive survey of the genetic heterogeneity, refinement of the clinical definition, and genotype-phenotype correlations as a strategy for molecular diagnosis" (PDF). Hum. Mutat. 23 (4): 306–17. doi:10.1002/humu.20010. hdl:10400.17/2439. PMID 15024725.
• McKay GJ, Clarke S, Davis JA, et al. (2005). "Pigmented paravenous chorioretinal atrophy is associated with a mutation within the crumbs homolog 1 (CRB1) gene". Invest. Ophthalmol. Vis. Sci. 46 (1): 322–8. doi:10.1167/iovs.04-0734. PMID 15623792.
• Kantardzhieva A, Gosens I, Alexeeva S, et al. (2005). "MPP5 recruits MPP4 to the CRB1 complex in photoreceptors". Invest. Ophthalmol. Vis. Sci. 46 (6): 2192–201. doi:10.1167/iovs.04-1417. PMID 15914641.
• Booij JC, Florijn RJ, ten Brink JB, et al. (2006). "Identification of mutations in the AIPL1, CRB1, GUCY2D, RPE65, and RPGRIP1 genes in patients with juvenile retinitis pigmentosa". J. Med. Genet. 42 (11): e67. doi:10.1136/jmg.2005.035121. PMC 1735944. PMID 16272259.