Polycomb, epigenomes, and control of cell identity

Valerio Orlando

Research output: Contribution to journalArticlepeer-review


In development, cell identity is maintained by epigenetic functions that prevent changes in cell type-specific transcription programs. Recent insights into gene silencing mechanisms by Polycomb group (PcG) and trithorax group (trxG) proteins reveal that the memory system involves a concerted process of chromatin modification, blocking of RNA polymerase II, and synthesis of noncoding RNA. Remarkably, cell memory is regulated by a balance between repressors and activators that maintains both transcription status and at the same time the possibility of switching to a different state.

Original languageEnglish
Pages (from-to)599-606
Number of pages8
Issue number5
Publication statusPublished - Mar 7 2003

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology


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