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Learn MoreThe Polycomb repressive complex 2 (PRC2) catalyzes H3K27 methylation and is required for maintaining transcriptional patterns and cellular identity, but the specification and maintenance of genomic PRC2 binding and H3K27 methylation patterns remain incompletely understood. Epigenetic mechanisms have been proposed, wherein pre-existing H3K27 methylation directs recruitment and regulates the catalytic activity of PRC2 to support its own maintenance. Here we investigate if such mechanisms are required for specifying H3K27 methylation patterns in mouse embryonic stem cells. Through genetic knockouts of subunits, we find that PRC2 is responsible for all levels of H3K27 methylation, and that methylation patterns can be accurately established de novo, when a subunit is reintroduced in the absence of pre-existing H3K27 methylation and PRC2 chromatin binding. Furthermore, we find that the core-subunit SUZ12 directs genomic binding of PRC2, which is essential for establishing correct methylation patterns. SOURCE: Jonas,Westergaard,Hojfeldt (jonas.hojfeldt@bric.ku.dk) - Helin University of Copenhagen
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