Data released on February 05, 2015
Epigenetic alterations such as aberrant DNA methylation of promoter and enhancer regions that lead to atypical gene expression have been associated with carcinogenesis. In HCC, genome-wide analysis of methylation is only recently used. Improving the analytic outcomes with even higher resolution is required to identify previously unknown regions and genes differentially methylated in HCC for better understanding of altered methylation in hepatocarcinogenesis. In this study, we used the optimized liquid hybridization capture-based bisulfite sequencing (LHC-BS) approach to quantitatively analyze 1,374,799 CpG sites of individual samples from 8 pairs of HCCs and their adjacent tissues (see GEO dataset linked below).
Here we present the gene specific methylation data of 12 genes of interested that were identified with altered promoter methylation in the genome-wide study. We utilized the Illumina MiSeq platform to assess DNA methylation levels in an additional 78 HCC tumour/normal matched pairs of samples. In correlation with the gene expression profiles, we were able to confirm 7 of the 12 genes, including SMAD6, IFITM1, LRRC4, CHST4, and TBX15 with promoter hypermethylation; and CCL20 and NQO1 with promoter hypomethylation in HCCs.