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Symbol ABCB1 contributors: mct - updated : 19-08-2008
HGNC name ATP-binding cassette, sub-family B (MDR/TAP), member 1
HGNC id 40
Location 7q21.1      Physical location : 87.132.947 - 87.342.564
Synonym name
  • P glycoprotein 1
  • multiple drug resistance 1
  • CD243 antigen
  • colchicin sensitivity
  • doxorubicin resistance
  • Synonym symbol(s) MDR1, PGY1, CLCS, P-gp, ABC20, CD243, GP170, MGC163296, IBD13
    TYPE functioning gene
    STRUCTURE 210.00 kb     27 Exon(s)
    10 Kb 5' upstream gene genomic sequence study
    MAPPING cloned Y linked N status confirmed
    Physical map
    HMG17P1 7q11-q21 high-mobility group (nonhistone chromosomal) protein 17 pseudogene 1 LOC285984 7q21.12 similar to Heterogeneous nuclear ribonucleoprotein A1 (Helix-destabilizing protein) (Single-strand binding protein) (hnRNP core protein A1) (HDP-1) (Topoisomerase-inhibitor suppressed) SEMA3D 7q21.12 sema domain, immunoglobulin domain (Ig), short basic domain, secreted, (semaphorin) 3D LOC392067 7 similar to dynein, cytoplasmic, light peptide GRM3 7q21.1-q21.2 glutamate receptor, metabotropic 3 FLJ31340 7q21.13 hypothetical protein FLJ31340 DMTF1 7q21.1 cyclin D binding myb-like transcription factor 1 C7orf23 7q21.1-q21.2 chromosome 7 open reading frame 23 TP53AP1 7q21.1 TP53 activated protein 1 CROT 7q21.1 carnitine O-octanoyltransferase ABCB4 7q21.1 ATP-binding cassette, sub-family B (MDR/TAP), member 4 ABCB1 7q21.1 ATP-binding cassette, sub-family B (MDR/TAP), member 1 RPIB9 7q21.13 Rap2-binding protein 9 MCFP 7q21.13 mitochondrial carrier family protein ASK 7q21.3 mitochondrial carrier family protein ADAM22 7q21.1 a disintegrin and metalloproteinase domain 22 SRI 7q21.1 sorcin FLJ23153 7q21.13 likely ortholog of mouse tumor necrosis-alpha-induced adipose-related protein LOC392068 7 similar to CSRP2 binding protein isoform a; CRP2 binding protein; cysteine rich protein 2 binding protein; CRP2 binding partner LOC392069 7 similar to Importin alpha-2 subunit (Karyopherin alpha-2 subunit) (SRP1-alpha) (RAG cohort protein 1) LOC219558 7q21.13 similar to elongation factor 1 alpha FLJ32110 7q21.13-q21.2 hypothetical protein FLJ32110 MGC26647 7q21.13 hypothetical protein MGC26647 STEAP 7q21 six transmembrane epithelial antigen of the prostate STEAP2 7q21 six transmembrane epithelial antigen of prostate 2 FLJ21062 7q21.2 hypothetical protein FLJ21062 LOC85865 7q21.2 hypothetical protein BC004923 CLDN12 7q21 claudin 12 PFTK1 7q21-q13 PFTAIRE protein kinase 1
    regionally located P-glycoprotein with a Y-box sequence 5' - CTGATTGG - 3' in its cis-regulatory elements
    TRANSCRIPTS type messenger
    identificationnb exonstypebpproduct
    ProteinkDaAAspecific expressionYearPubmed
    27 - 4872 141 1280 - -
    Type widely
       expressed in (based on citations)
    SystemOrgan level 1Organ level 2Organ level 3Organ level 4LevelPubmedSpeciesStageRna symbol
    Digestiveintestinesmall intestine   
    Endocrineadrenal gland   predominantly
     nerve   highly
    Reproductivefemale systemuterus  moderately
     male systemtestis  moderately Homo sapiens
    Respiratoryrespiratory tracttrachea  highly
    SystemTissueTissue level 1Tissue level 2LevelPubmedSpeciesStageRna symbol
    SystemCellPubmedSpeciesStageRna symbol
    ReproductiveSertoli cell Homo sapiens
    cell lineage
    cell lines
    at STAGE
    physiological period embryo
    Text neural stem, progenitor cells
  • two ATP binding and two transmembrane (2TM) domains (2 x 6 segments)
  • two hydrophobic and hydrophilic domains linked by a highly charged region of approximately 90 AAs, the "linker domain" mediating protein interactions
  • lipid translocase of broad specificity
  • conjugated GlycoP
    interspecies homolog to rattus Abcb1a (87.6 pc)
    homolog to murine Abcb1a (87.5 pc)
  • ABC (ATP binding cassette) transporter superfamily
  • multidrug resistance exporter (TC 3.A.1.201) subfamily
  • subfamily B (MDR/TAP)
  • CATEGORY enzyme , transport carrier
    SUBCELLULAR LOCALIZATION     plasma membrane
    basic FUNCTION
  • ABC transporter, traffic ATPase, emergy-dependent efflux pump responsible for decreased drug accumulation in multidrug resistant cells
  • potentially implicated in cholesterol transport
  • may maintain neural stem/progenitor cells in an undifferentiated state and could be a neural stem/progenitor marker
  • cause multidrug resistance in tumor cell lines selected with lipophilic anticancer drugs
  • drug efflux transporter expressed in various tissues and playing an important role in the absorption and elimination of many drugs and xenobiotics
  • is involved in BTB (blood–testis barrier) restructuring during spermatogenesis but ABCB1–mediated restructuring does not “open up” the BTB to make it freely permeable to drugs
    text cholesterol transport
    a component
  • ABCB1 and an integrated component of the occludin/zonula occludens 1 (TJP1) adhesion complex at the BTB, structurally interacted with PTK2, creating the OCLN/TJP1/PTK2/ABCB1 regulatory complex
    small molecule nucleotide,
  • ATP
  • protein
  • APEX1 stably interacts with Y-box-binding protein 1 (YBX1), and acts as its coactivator for the expression of multidrug resistance gene ABCB1, thereby causing drug resistance
  • involved in regulating BTB dynamics, likely via its interaction with PTK2, which modulates the phosphorylation status of the OCLN/TJP1 protein complex
  • cell & other
    activated by function can be stimulated in the presence of cholesterol
    induced by THRA, THRB (induces ABCB1 gene expression in a thyroid hormone (TH)-dependent manner)
    Other upregulated by P/CAF : NFY heterodimer
    corresponding disease(s)
    Other morbid association(s)
    TypeGene ModificationChromosome rearrangementProtein expressionProtein Function
    tumoral   amplification    
    amplified in sarcoma cell lines
    tumoral     --over  
    in acute myeloid leukemia and cancer cell lines
    tumoral     --low  
    low ABCB1/low BAALC expression identifies a subgroup of intermediate cytogenetic risk AML patients with a remarkably good long-term outcome achieved by chemotherapy alone
  • to inflammatory bowel disease(IBD)
  • to renal epithelial tumors
  • Variant & Polymorphism other Ala893 increases the risk of IBD
    C3435T increases the risk of renal tumors
    Candidate gene
    Therapy target