gene regulation and epigenetic remodeling in murine embryonic stem cells by c-myc基因调控和表观遗传改造原癌基因在小鼠胚胎干细胞.pdfVIP
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gene regulation and epigenetic remodeling in murine embryonic stem cells by c-myc基因调控和表观遗传改造原癌基因在小鼠胚胎干细胞
Gene Regulation and Epigenetic Remodeling in Murine Embryonic Stem Cells by c-Myc 1 2 3 2 1 Chin-Hsing Lin , ChenWei Lin , Hisashi Tanaka , Matthew L. Fero , Robert N. Eisenman * 1 Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America, 2 Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America, 3 Department of Molecular Genetics, Cleveland Clinic Foundation, Cleveland, Ohio, United States of America Abstract Background: The Myc oncoprotein, a transcriptional regulator involved in the etiology of many different tumor types, has been demonstrated to play an important role in the functions of embryonic stem (ES) cells. Nonetheless, it is still unclear as to whether Myc has unique target and functions in ES cells. Methodology/Principal Findings: To elucidate the role of c-Myc in murine ES cells, we mapped its genomic binding sites by chromatin-immunoprecipitation combined with DNA microarrays (ChIP-chip). In addition to previously identified targets we identified genes involved in pluripotency, early development, and chromatin modification/structure that are bound and regulated by c-Myc in murine ES cells. Myc also binds and regulates loci previously identified as Polycomb (PcG) targets, including genes that contain bivalent chromatin domains. To determine whether c-Myc influences the epigenetic state of Myc-bound genes, we assessed the patterns of trimethylation of histone H3-K4 and H3-K27 in mES cells containing normal, increased, and reduced levels of c-Myc. Our analysis reveals widespread and surprisingly diverse changes in repressive and activating histone methylation marks both proximal and distal to Myc bind
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