Abstract
Normal development and homeostasis requires a carefully coordinated gene expression program. Appropriate transcriptional regulation is maintained, in part, through epigenetic modifications of both DNA and histones. It is now apparent that the epigenetic landscape is complex and carefully controlled to both silence and activate gene transcription and that these states remain exquisitely poised for reversal. The deregulation of epigenetics in cancer is common and results in both the activation of oncogenes and the silencing of tumor suppressors. A tremendous amount of research corroborates the existence in many tumor types of a cancer stem cell that is both the origin and cell type responsible for resistance of tumors to current therapies. As our understanding of cancer stem cell biology continues, it is apparent that these cells are also under the influence of epigenetic regulation. We will discuss the cancer stem cell hypothesis and the role of epigenetics in both normal and cancer stem cell biology.
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