description
Polycomb group proteins are responsible for the heritable repression of genes during development (Lee et al. 2006, Ku et al. 2008, reviewed in Simon and Kingston 2009, Margueron and Reinberg 2011, Di Croce and Helin 2013). Two major families of Polycomb complexes exist: Polycomb Repressive Complex 1 (PRC1) and Polycomb Repressive Complex 2 (PRC2). PRC1 and PRC2 each appear to comprise sets of distinct complexes that contain common core subunits and distinct accessory subunits (reviewed in Nayak et al. 2011). PRC2, through its component EZH2 or, in some complexes, EZH1 produces the initial molecular mark of repression, the trimethylation of lysine-27 of histone H3 (H3K27me3). How PRC2 is initially recruited to a locus remains unknown, however cytosine-guanine (CpG) motifs and transcripts have been suggested. Different mechanisms may be used at different loci. The trimethylated H3K27 produced by PRC2 is bound by the Polycomb subunit of PRC1. PRC1 ubiquitinates histone H2A and maintains repression

external resources
NCBI:1269735
REACTOME:R-HSA-212300
PUBMED:23473600
PUBMED:18974828
PUBMED:24096405
PUBMED:21248841
PUBMED:19738629
PUBMED:21941108

genes
DNMT1 , DNMT3A , DNMT3B , EZH2 , HIST1H2AE , HIST1H2AD , H2AFX , H2AFZ , HIST1H2BD , HIST1H2BB , H3F3A , H3F3B , JARID2 , PHF1 , RBBP4 , RBBP7 , HIST1H4I , HIST1H2AJ , HIST1H2AC , HIST1H2AB , HIST2H2AA3 , HIST2H2AC , HIST1H2BG , HIST1H2BL , HIST1H2BN , HIST1H2BM , HIST1H2BF , HIST1H2BE , HIST1H2BH , HIST1H2BI , HIST1H2BC , HIST1H2BO , HIST2H2BE , HIST1H3A , HIST1H3D , HIST1H3C , HIST1H3E , HIST1H3I , HIST1H3G , HIST1H3J , HIST1H3H , HIST1H3B , HIST1H4A , HIST1H4D , HIST1H4F , HIST1H4K , HIST1H4J , HIST1H4C , HIST1H4H , HIST1H4B , HIST1H4E , HIST1H4L , HIST2H4A , EED , HIST1H3F , HIST1H2BJ , MTF2 , SUZ12 , PHF19 , H2AFJ , HIST1H2BK , H2AFV , HIST4H4 , AEBP2 , HIST2H3C , HIST3H2BB , HIST1H2BA , HIST2H3A , H2AFB1 , HIST2H4B , HIST2H3D , HIST2H2AA4 , MIR4738 ,