ATP8B1

ATPase, aminophospholipid transporter, class I, type 8B, member 1
Identifiers
Symbols	ATP8B1 ; ATPIC; BRIC; FIC1; ICP1; PFIC; PFIC1
External IDs	OMIM: 602397 MGI: 1859665 HomoloGene: 21151 GeneCards: ATP8B1 Gene
EC number	3.6.3.1
Gene ontology Molecular function • magnesium ion binding • phospholipid-translocating ATPase activity • protein binding • ATP binding • cardiolipin binding Cellular component • endoplasmic reticulum • Golgi apparatus • plasma membrane • integral component of plasma membrane • apical plasma membrane • brush border membrane • stereocilium Biological process • drug transmembrane transport • Golgi organization • sensory perception of sound • bile acid metabolic process • bile acid and bile salt transport • vestibulocochlear nerve formation • regulation of microvillus assembly • ion transmembrane transport • phospholipid translocation • negative regulation of transcription, DNA-templated • transmembrane transport • inner ear receptor cell development Sources: Amigo / QuickGO
RNA expression pattern
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	5205	54670
Ensembl	ENSG00000081923	ENSMUSG00000039529
UniProt	O43520	Q148W0
RefSeq (mRNA)	NM_005603	NM_001001488
RefSeq (protein)	NP_005594	NP_001001488
Location (UCSC)	Chr 18: 57.65 – 57.8 Mb	Chr 18: 64.53 – 64.66 Mb
PubMed search

Probable phospholipid-transporting ATPase IC is an enzyme that in humans is encoded by the ATP8B1 gene.^[1][2][3] This protein is associated with progressive familial intrahepatic cholestasis type 1 as well as benign recurrent intrahepatic cholestasis.^[4]

Function

This gene encodes a member of the P-type cation transport ATPase family and specifically belongs to the subfamily of aminophospholipid-transporting ATPases. This protein is highly expressed in the small intestine, stomach, pancreas, and prostate and is also found in cholangiocytes and the canalicular membranes of hepatocytes in the liver.^[5][6] The aminophospholipid translocases transport phosphatidylserine and phosphatidylethanolamine from one side of a bilayer to another. Mutations in this gene may result in progressive familial intrahepatic cholestasis type 1 and in benign recurrent intrahepatic cholestasis.^[3] Exactly how mutations result in these diseases is not currently understood.

References

1. Bull LN, van Eijk MJ, Pawlikowska L, DeYoung JA, Juijn JA, Liao M, Klomp LW, Lomri N, Berger R, Scharschmidt BF, Knisely AS, Houwen RH, Freimer NB (Mar 1998). "A gene encoding a P-type ATPase mutated in two forms of hereditary cholestasis". Nat Genet 18 (3): 219–24. doi:10.1038/ng0398-219. PMID 9500542.
2. Carlton VE, Knisely AS, Freimer NB (Oct 1995). "Mapping of a locus for progressive familial intrahepatic cholestasis (Byler disease) to 18q21-q22, the benign recurrent intrahepatic cholestasis region". Hum Mol Genet 4 (6): 1049–53. doi:10.1093/hmg/4.6.1049. PMID 7655458.
3. "Entrez Gene: ATP8B1 ATPase, Class I, type 8B, member 1".
4. Klomp LW, Vargas JC, van Mil SW, et al. (July 2004). "Characterization of mutations in ATP8B1 associated with hereditary cholestasis". Hepatology 40 (1): 27–38. doi:10.1002/hep.20285. PMID 15239083.
5. Jansen PL, Müller M (July 2000). "The molecular genetics of familial intrahepatic cholestasis". Gut 47 (1): 1–5. doi:10.1136/gut.47.1.1. PMC 1727973. PMID 10861251.
6. Eppens EF, van Mil SW, de Vree JM, et al. (October 2001). "FIC1, the protein affected in two forms of hereditary cholestasis, is localized in the cholangiocyte and the canalicular membrane of the hepatocyte". J. Hepatol. 35 (4): 436–43. doi:10.1016/S0168-8278(01)00158-1. PMID 11682026.

Further reading

• Knisely AS (2000). "Progressive familial intrahepatic cholestasis: a personal perspective". Pediatr. Dev. Pathol. 3 (2): 113–25. doi:10.1007/s100240050016. PMID 10679031.
• Harris MJ, Le Couteur DG, Arias IM (2006). "Progressive familial intrahepatic cholestasis: genetic disorders of biliary transporters". J. Gastroenterol. Hepatol. 20 (6): 807–17. doi:10.1111/j.1440-1746.2005.03743.x. PMID 15946126.
• Clayton RJ, Iber FL, Ruebner BH, McKusick VA (1969). "Byler disease. Fatal familial intrahepatic cholestasis in an Amish kindred". Am. J. Dis. Child. 117 (1): 112–24. doi:10.1001/archpedi.1969.02100030114014. PMID 5762004.
• Houwen RH, Baharloo S, Blankenship K, et al. (1995). "Genome screening by searching for shared segments: mapping a gene for benign recurrent intrahepatic cholestasis". Nat. Genet. 8 (4): 380–6. doi:10.1038/ng1294-380. PMID 7894490.
• Halleck MS, Pradhan D, Blackman C, et al. (1998). "Multiple members of a third subfamily of P-type ATPases identified by genomic sequences and ESTs". Genome Res. 8 (4): 354–61. doi:10.1101/gr.8.4.354. PMID 9548971.
• Tygstrup N, Steig BA, Juijn JA, et al. (1999). "Recurrent familial intrahepatic cholestasis in the Faeroe Islands. Phenotypic heterogeneity but genetic homogeneity". Hepatology 29 (2): 506–8. doi:10.1002/hep.510290214. PMID 9918928.
• Halleck MS, Lawler JF JR, Blackshaw S, et al. (2001). "Differential expression of putative transbilayer amphipath transporters" (PDF). Physiol. Genomics 1 (3): 139–50. PMID 11015572.
• Klomp LW, Bull LN, Knisely AS, et al. (2001). "A missense mutation in FIC1 is associated with greenland familial cholestasis". Hepatology 32 (6): 1337–41. doi:10.1053/jhep.2000.20520. PMID 11093741.
• Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932.
• Harris MJ, Arias IM (2003). "FIC1, a P-type ATPase linked to cholestatic liver disease, has homologues (ATP8B2 and ATP8B3) expressed throughout the body". Biochim. Biophys. Acta 1633 (2): 127–31. doi:10.1016/S1388-1981(03)00107-0. PMID 12880872.
• Chen F, Ananthanarayanan M, Emre S, et al. (2004). "Progressive familial intrahepatic cholestasis, type 1, is associated with decreased farnesoid X receptor activity". Gastroenterology 126 (3): 756–64. doi:10.1053/j.gastro.2003.12.013. PMID 14988830.
• Gerhard DS, Wagner L, Feingold EA, et al. (2004). "The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)". Genome Res. 14 (10B): 2121–7. doi:10.1101/gr.2596504. PMC 528928. PMID 15489334.
• Demeilliers C, Jacquemin E, Barbu V, et al. (2006). "Altered hepatobiliary gene expressions in PFIC1: ATP8B1 gene defect is associated with CFTR downregulation". Hepatology 43 (5): 1125–34. doi:10.1002/hep.21160. PMID 16628629.

External links

• ATP8B1 protein, human at the US National Library of Medicine Medical Subject Headings (MeSH)