GSE124214
Increased sulfation of bile acids in mice and human subjects with sodium taurocholate cotransporting polypeptide deficiency
Purpose: To decipher the biochemical basis for the declining of total bile acids (TBA) levels in the late age of Slc10a1-/- mice, we performed a serial liver RNA-Seq analysis of mRNA expression with male mice at different ages. Methods: Liver mRNA profiles of 4-week, 8-week, 20-month-old wild-type (WT) and sodium taurocholate cotransporting polypeptide knockout (Slc10a1-/-) mice were generated by deep sequencing, in triplicate, quadruplicate or sextuplicate, using  Illumina Hiseq-2500 platform. Clean mRNA-seq reads were aligned to the mouse reference genome (GRCm38) with TopHat (v2.0.13), guided by Ensembl gene annotation v83. Only uniquely aligned and properly paired reads were retained for further analysis. Gene-level read counts were calculated with HTseq (v0.6.1p1) with the union mode. Genes with less than a total of 11 non-normalized reads across all samples were excluded. Data normalization and statistical analysis of differential expression were performed with the DEseq2 (v1.10.0) R package. Pair-wise Spearman correlation between samples across all quantified genes used for hierarchical clustering. Results: At 4 weeks and 8 weeks, WT and Slc10a1-/- mice exhibited clear different pattern in terms of transcriptome similarity and were well separated, however, the difference was indistinguishable at 20 months.And changes of pathways involved in the metabolism of xenobiotics in Slc10a1-/- mice. Conclusions: Our study reveal that enhanced BA sulfation is a major mechanism for BA detoxification and elimination in Slc10a1-/- mice with hypercholanemia. Overall design: Liver mRNA profiles of 4-week, 8-week, 20-month-old wild-type (WT) and sodium taurocholate cotransporting polypeptide knockout (Slc10a1-/-) mice were generated by deep sequencing, in triplicate, quadruplicate or sextuplicate, using  Illumina Hiseq-2500 platform.