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Global methylation profiling to identify epigenetic signature of gallbladder cancer and gallstone disease.
Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine 2016 November
Promoter methylation in various tumor suppressor genes is reported to influence gallbladder carcinogenesis. Here, we aimed to identify methylation status in gallbladder cancer (GBC) by performing a comprehensive genome-wide DNA methylation profiling. The methylation status of 485,577 CpG sites were investigated using Illumina's Infinium Human Methylation 450 BeadChip array in 24 tissues (eight each of tumor, adjacent non-tumor, and gallstone). About 33,443 differentially methylated sites (DMRs) were obtained in the whole human genome, of which 24,188 (72 %) were hypermethylated and 9255 (28 %) were hypomethylated. The data also revealed that majority of the DMRs are localized on the proximal promoter region [Transcription start sites (TSS200, TSS1500) and 5' untranslated region (5'UTR)] and first exon. Exclusion of first exon detected a total of 10,123 (79 %) hypermethylated and 2703 (21 %) hypomethylated sites. Comparative analysis of the later with our differential proteomics data resulted in identification of 7 hypermethylated or down-regulated (e.g., FBN1, LPP, and SOD3) and 61 hypomethylated or up-regulated markers (e.g., HBE1, SNRPF, TPD52) for GBC. These genes could be further validated on the basis of their methylation/expression status in order to identify their utility to be used as biomarker/s for early diagnosis and management of GBC.
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