ABCMdb

PMID: 21103972

Cascorbi I
P-glycoprotein: tissue distribution, substrates, and functional consequences of genetic variations.
Handb Exp Pharmacol. 2011;(201):261-83., [PubMed]

Sentences

No. Mutations Sentence Comment

13 ABCB1 p.Asn183Ser ABCB1 p.Ser400Asn ABCB1 p.Asn21Asp ABCB1 p.Gln1107Pro ABCB1 p.Ser1141Thr ABCB1 p.Arg492Cys ABCB1 p.Met986Val Absence of the gene, as being the case in double-knockout mice, is conformable N21D S400N A893S/T Q1107P 3435C>T1236T>C N183S R492C S1141T NBD1 NBD2 Intracellular (e.g. lymphocyte) Extracellular M986V Fig. 1 Two-dimensional structure of ABCB1 with locations of amino acid replacements and two frequent synonymous SNPs, NBD ¼ nucleotide binding domain [adapted from Cascorbi and Haenisch (2010)] Inducer intra cellular ABCB1 Transkription Translation ABCB1 (P-gp) luminal Fig. 2 Induction of ABCB1 via the nuclear PXR/RXR receptor leading to accelerated extrusion of P-glycoprotein substrates with life. Login to comment 60 ABCC1 p.Ala893Ser ABCB1 p.Ala999Thr These SNPs caused an Ala893Ser and Ala999Thr exchange, respectively. Login to comment 75 ABCC1 p.Ala893Ser The missense variant 2677G>T/A coding for the three different amino acids A893S/T exhibits altered transport properties in membrane vesicles from Sf9 insect cells, overexpressing human ABCB1. Login to comment 78 ABCB1 p.Ser400Asn The rare missense SNP 1199G>T (Ser400Asn) was associated with lower transport capacity in vitro leading to putatively higher sensitivity against cytostatics. Login to comment 81 ABCC1 p.Ala893Ser ABCB1 p.Asn183Ser ABCB1 p.Ser400Asn ABCB1 p.Asn21Asp ABCB1 p.Gln1107Pro ABCB1 p.Ser1141Thr ABCB1 p.Arg492Cys ABCB1 p.Met986Val ABCB1 p.Gly191Arg ABCB1 p.Ser400Ile Table 2 Frequency of ABCB1 genetic variants in Caucasians, position on DNA, putative effect, and frequencies [according to Cascorbi (2006) and Cascorbi and Haenisch (2010)] Position Amino acid or effect Frequency of the variant allele Association to expression, kinetics or drug response 50 -flanking À2903 T>C 0.02a 50 -flanking À2410 T>C 0.10a Decreased mRNAa 50 -flanking À2352 G>A 0.28a 50 -flanking À1910 T>C 0.10a 50 -flanking À1717 T>C 0.02a 50 -flanking À1325 A>G 0.02a 50 -flanking À934 A>G 0.10a 50 -flanking À692 T>C 0.10a Decreased mRNAa 50 -flanking À41 A>G 0.09b IVS 1a À145 C>G 0.02b IVS 1b À129 T>C 0.06b IVS 1b 12 T>C 0.06c IVS 2 À1 G>A 0.09d c. 61 A>G N21D 0.11d IVS 5 À35 G>C Intronic 0.006c IVS 5 À25 G>T Intronic 0.16c IVS 6 þ139 C>T Intronic 0.37d c. 548 A>G N183S 0.01e c. 571 G>A G191R 0.07f Reduced chemotherapy resistancef c. 1199 G>A S400N 0.05d c. 1199 C>T S400I 0.02g Elevated activityg c. 1236 C>T Synonymous 0.41d Increased imatinib disposition and therapy responseh IVS 12 þ44 C>T Intronic 0.05d c. 1474 C>T R492C 0.01e IVS 17 À76 T>A Intronic 0.46d IVS 17 þ137 A>G Intronic 0.006c c. 2650 C>T Synonymous 0.03e c. 2677 G>T/A A893S/T 0.42d /0.02d In vitro increased vmax,i increased imatinib response in CMLh c. 2956 A>G M986V 0.005b c. 3320 A>C Q1107P 0.002d c. 3396 C>T Synonymous 0.03c c. 3421 T>A S1141T 0.00c c. 3435 C>T Synonymous 0.54d Decreased mRNA and protein expression,e, k decreased in vitro transport,l no effect on expression and bioavailability of talinolol,m no effect on in vitro transport,n, o decreased digoxin (continued) 4.2.1 Digoxin The heart glycoside digoxin is widely accepted as typical P-glycoprotein substrate. Login to comment 175 ABCB1 p.Gly191Arg The attempt to find any further ABCB1 variant influencing the activity or being associated to the clinical response revealed a novel ABCB1 571G>A missense variant detected in 6.4% of leukemia patients, causing a Gly191Arg amino acid change (Yang et al. 2008). Login to comment