Abstract
The apical sodium-dependent bile acid transporter (SLC10A2) plays a key role in the reabsorption of luminal bile acids into the enterohepatic circulation. Rare variations in SLC10A2 have been reported to be associated with Crohn’s disease, primary bile acid malabsorption and familial hypertriglyceridemia; however, variants associated with reduced SLC10A2 expression have not been reported to date. In this study, we have performed a sequence analysis of SLC10A2 using genomic DNA of 93 individuals. A new haplotype structure was identified including ten variants with complete linkage disequilibrium (LD′ = 1.0, r 2 = 1.0) of which six polymorphisms were novel. The sequence variants were confirmed in three independent cohorts (n = 1,290) by a recently established MALDI-TOF MS iPLEX™ assay. Remarkably, haplotype carriers with the minor allele exhibited significant reduced ileal SLC10A2 expression on mRNA levels (2.6-fold, P = 0.0009) and protein levels (2.4-fold, P = 0.0157). In future studies a single tag SNP selected of this haplotype block will provide reliable genetic testing to investigate systemically the influence of the SLC10A2 haplotype for disease susceptibility and/or drug response.
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Acknowledgments
This work was supported by the Robert Bosch Foundation, Stuttgart. We are grateful to Dr. P. A. Dawson (Wake Forest University, Winston-Salem, USA) for the generous gift of the ASBT primary antibody. Moreover, we thank the staff of the gastroenterological department and endoscopy team for recruitment of patients and collecting tissue biopsies. The authors also thank Dr. Christina Justenhoven for the helpful and competent discussion by preparation of this manuscript. The authors are also very grateful to André Strohmeyer for his excellent technical assistance.
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439_2009_630_MOESM2_ESM.eps
Influence of haplotype block on SLC10A2 mRNA and protein expression comparing individuals without haplotype block (n=74) to carriers of the haplotype (n=11). The expression analysis was performed in human ileal mucosal biopsies and is represented as scatter dot plot (a) and as well as box and whiskers (b). Quantitative analysis of SLC10A2 mRNA expression is given as transcript numbers. All data are represented as means ± SEM. A P value of <0.05 was considered statistically significant (EPS 172 kb)
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Renner, O., Harsch, S., Schaeffeler, E. et al. Mutation screening of apical sodium-dependent bile acid transporter (SLC10A2): novel haplotype block including six newly identified variants linked to reduced expression. Hum Genet 125, 381–391 (2009). https://doi.org/10.1007/s00439-009-0630-0
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DOI: https://doi.org/10.1007/s00439-009-0630-0