The bromodomain protein BRD4 is involved in cell proliferation and cell cycle progression, primarily through its role in acetylated chromatin-dependent regulation of transcription at targeted loci. Here, we show that BRD4 is frequently downregulated by aberrant promoter hypermethylation in human colon cancer cell lines and primary tumors. Ectopic re-expression of BRD4 in these colon cancer cell lines markedly reduced in vivo tumor growth, suggesting a role of BRD4 in human colon cancer.
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