title: Transcription onset of genes critical in liver carcinogenesis is epigenetically regulated by methylated DNA-binding protein MBD2.
abstract: We previously delineated genes whose promoters are hypomethylated and induced in hepatocellular carcinoma (HCC) patients. The purpose of this study was to establish the players that regulate these genes in liver cancer cells. We performed chromatin immunoprecipitation with methyl-CpG-binding domain protein 2 (MBD2), RNA polymerase II (RNA pol II), CCAAT/enhancer-binding protein alpha (CEBPA) antibodies and methylated DNA immunoprecipitation in HepG2 liver cancer cells treated with scrambled small interfering RNA (siRNA) and siRNA to MBD2 or CEBPA. We then hybridized DNA to microarrays spanning the entire coding sequences, introns and regulatory regions of several hundred HCC-hypomethylated genes. These analyses reveal that MBD2 binds a significant fraction of the hypomethylated genes, determines RNA pol II binding and DNA methylation state. MBD2 binding can result in promoter activation and hypomethylation or in repression. In activated target genes, MBD2 colocalizes with the transcription factor CEBPA, and MBD2 binding at these positions is reduced upon CEBPA depletion. Significant fraction of MBD2 effects on DNA methylation and transcription appears to be indirect since changes occur upon MBD2 depletion in genes where no MBD2 binding was detected. Our study delineates the rules governing the interaction of MBD2 with its targets and the consequences to RNA pol II binding and DNA methylation states. This has important implications for understanding the role of DNA methylation in cancer and targeting DNA methylation proteins in cancer therapy.
authors: Department of Pharmacology and Therapeutics, McGill University, Montreal, Quebec H3G 1Y6, Canada.
authors: Barbara
authors: B
authors: Stefanska
authors: Matthew
authors: M
authors: Suderman
authors: Ziv
authors: Z
authors: Machnes
authors: Bishnu
authors: B
authors: Bhattacharyya
authors: Michael
authors: M
authors: Hallett
authors: Moshe
authors: M
authors: Szyf
mesh_terms: D001665:Binding Sites / Q000235:genetics; D022762:CCAAT-Enhancer-Binding Proteins / Q000235:genetics; D063646:Carcinogenesis / Q000235:genetics* / Q000473:pathology; D006528:Carcinoma, Hepatocellular / Q000235:genetics / Q000473:pathology; D045744:Cell Line, Tumor; D019175:DNA Methylation / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics*; D044127:Epigenesis, Genetic / Q000235:genetics*; D056945:Hep G2 Cells; D006801:Humans; D008099:Liver / Q000473:pathology; D008113:Liver Neoplasms / Q000235:genetics / Q000473:pathology*; D011401:Promoter Regions, Genetic / Q000235:genetics; D012319:RNA Polymerase II / Q000235:genetics; D014157:Transcription Factors / Q000235:genetics; D014158:Transcription, Genetic / Q000235:genetics*
chemical_list: D022762:CCAAT-Enhancer-Binding Proteins; C515848:CEBPA protein, human; D004268:DNA-Binding Proteins; C489325:MBD2 protein, human; D014157:Transcription Factors; D012319:RNA Polymerase II