ABCMdb

ABCA10 p.Pro265Phe

Predicted by SNAP2:	A: D (59%), C: D (53%), D: D (75%), E: D (80%), F: D (71%), G: D (63%), H: D (66%), I: D (66%), K: D (80%), L: D (66%), M: D (71%), N: D (71%), Q: D (71%), R: D (80%), S: D (59%), T: D (63%), V: D (66%), W: D (71%), Y: D (75%),
Predicted by PROVEAN:	A: D, C: D, D: D, E: D, F: D, G: D, H: D, I: D, K: D, L: D, M: D, N: D, Q: D, R: D, S: D, T: D, V: D, W: D, Y: D,

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[hide] Gene expression profiling of ABC transporters in d... Lab Invest. 2008 Dec;88(12):1303-15. Epub 2008 Oct 20. Hendig D, Langmann T, Kocken S, Zarbock R, Szliska C, Schmitz G, Kleesiek K, Gotting C
Gene expression profiling of ABC transporters in dermal fibroblasts of pseudoxanthoma elasticum patients identifies new candidates involved in PXE pathogenesis.
Lab Invest. 2008 Dec;88(12):1303-15. Epub 2008 Oct 20., [PMID:18936737]

Abstract [show]
Mutations in the ABCC6 gene, encoding the multidrug resistance-associated protein 6 (MRP6), cause pseudoxanthoma elasticum (PXE). This heritable disorder leads to pathological alterations in connective tissues. The implication of MRP6 deficiency in PXE is still unknown. Moreover, nothing is known about a possible compensatory expression of other ATP binding-cassette (ABC) transporter proteins in MRP6-deficient cells. We investigated the gene expression profile of 47 ABC transporters in human dermal fibroblasts of healthy controls (n=2) and PXE patients (n=4) by TaqMan low-density array. The analysis revealed the expression of 37 ABC transporter genes in dermal fibroblasts. ABCC6 gene expression was not quantifiable in fibroblasts derived from PXE patients. Seven genes (ABCA6, ABCA9, ABCA10, ABCB5, ABCC2, ABCC9 and ABCD2) were induced, whereas the gene expression of one gene (ABCA3) was decreased, comparing controls and PXE patients (with at least twofold changes). We reanalyzed the gene expression of selected ABC transporters in a larger set of dermal fibroblasts from controls and PXE patients (n=6, each). Reanalysis showed high interindividual variability between samples, but confirmed the results obtained in the array analysis. The gene expression of ABC transporter genes, as well as lineage markers of PXE, was further examined after inhibition of ABCC6 gene expression by using specific small-interfering RNA. These experiments corroborated the observed gene expression alterations, most notably in the ABCA subclass (up to fourfold, P<0.05). We therefore conclude that MRP6-deficient dermal fibroblasts exhibit a distinct gene expression profile of ABCA transporters, potentially to compensate for MRP6 deficiency. Moreover, our results point to a function for ABCC6/MRP6 in sterol transport, as sterols are preferential regulators of ABCA transporter activity and expression. Further studies are now required to uncover the role of ABCA transporters in PXE.

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62 Table 1 Main characteristics of dermal fibroblasts derived from PXE patients and healthy controls used in the present study Sample ID Gender Agea Biopsy source ABCC6 genotypeb Statusc Age at disease onseta Number of involved organs PXE patients P60F Female 58 Axilla c.37-1G4A (SSM) c.37-1G4A (SSM) hm 56 3 P229F Female 50 NA c.1171A4G (p.R391G) c.1208C4A (p.A413N) c.2252T4A (p.M751K) cht NA NA P265F Female 62 Cervix c.1132C4T (p.Q378X) c.3421C4T (p.R1141X) cht 16 3 P3M Male 57 Cervix c.3421C4T (p.R1141X) c.3883-6G4A (SSM) cht 46 5 P128M Male 51 Cervix c.3769_3770insC (p.L1259fsX1277) c.3769_3770insC (p.L1259fsX1277) hm 48 3 P308M Male 42 NA c.3421C4T (p.R1141X) c.-90ins14 (c)ht NA NA P341M Male 41 NA c.1552C4T (p.R518X) ND ht NA NA Healthy controls F37A Female 37 Abdomen - - - wt - - F42A Female 42 Abdomen - - - wt - - F52C Female 52 Cheek - - - wt - - M2FS Male 2 Foreskin - - - wt - - M45D Male 45 Face - - - wt - - M56D Male 56 Face - - - wt - - hm, homozygote; cht, compound heterozygote; ht, heterozygote; wt, wild type; SSM, splice site mutation; NA, not applicable; ND, nondetected. Login to comment
153 We performed the same experiments with ABCC6/MRP6-deficient cells from PXE patients P265F and P128M (Table 1). Login to comment