ABCB4

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ABCB4
Identifiers
Gene ontology
Molecular function
Cellular component
Biological process
Sources:Amigo / QuickGO
Ensembl
UniProt
RefSeq (mRNA)

NM_000443
NM_018849
NM_018850

NM_008830

RefSeq (protein)

NP_000434
NP_061337
NP_061338

NP_032856

Location (UCSC)Chr 7: 87.4 – 87.48 MbChr 5: 8.94 – 9.01 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

The ATP-binding cassette 4 (ABCB4) gene encodes multidrug resistance protein 3.[5][6][7] ABCB4 is associated with progressive familial intrahepatic cholestasis type 3 and intrahepatic cholestasis of pregnancy.

The membrane-associated

ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intra-cellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the MDR/TAP subfamily. Members of the MDR/TAP subfamily are involved in multidrug resistance as well as antigen presentation. This gene encodes a full transporter and member of the p-glycoprotein family of membrane proteins with phosphatidylcholine as its substrate (flippase activity). The function of this protein has not yet been determined; however, it may involve transport of phospholipids from liver hepatocytes into bile. Alternative splicing of this gene results in several products of undetermined function.[7]

Cancer

ABCB4 gene has been observed progressively downregulated in

human papillomavirus-positive neoplastic keratinocytes derived from uterine cervical preneoplastic lesions at different levels of malignancy. [8] For this reason, ABCB4 is likely to be associated with tumorigenesis and may be a potential prognostic marker for uterine cervical preneoplastic lesions progression.[8]

Other conditions that have been associated with mutations in this gene include low phospholipid associated cholelithiasis syndrome, high gamma glutamyl transferase intrahepatic cholestasis of pregnancy, chronic cholangiopathy and adult biliary fibrosis.[9]

References

  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000005471Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000042476Ensembl, 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. PMID 2892668
    .
  6. .
  7. ^ a b "Entrez Gene: ABCB4 ATP-binding cassette, sub-family B (MDR/TAP), member 4".
  8. ^
    S2CID 24986454
    .
  9. ^ Sticova E, Jirsa M (2019) ABCB4 disease: Many faces of one gene deficiency. Ann Hepatol

Further reading

External links


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