作者: Miguel Vidal
DOI: 10.1007/978-3-642-45198-0_5
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摘要: The Polycomb group (PcG) products are a set of evolutionary conserved proteins that form chromatin regulator complexes control expression developmentally relevant genes. PcG activity is essential not only to maintain the developmental potential pluripotent cells from which specialized cell types arise, but also ensure directionality differentiation process. In adult, these functions for normal homeostasis and their deregulation often associated with transformation events. PcG-dependent transcriptional involves posttranslational modifications histones, decreased DNA accessibility, other mechanisms. While stability Polycomb-determined landscapes rather stable in differentiated cells, it characteristically dynamic order accommodate execution genetic programs. Best known as repressors gene expression, recent evidence points at roles during activation. Besides control, participate such damage response, indicating involved wide spectrum cellular organismal need detailed characterization.