Promiscuous RNA binding by Polycomb repressive complex 2

Polycomb repressive complex 2 (PRC2) is a histone methyltransferase required for epigenetic silencing during development and cancer, and it can be recruited to chromatin by long noncoding RNAs. In vitro binding studies and comparative analysis of genome-wide in vivo data now suggest a model for the maintenance of the repressed chromatin state by PRC2, directed by PRC2's promiscuous binding to nascent RNA transcripts.