摘要：SummaryThe recruitment of Polycomb repressive complex 2 (PRC2) to gene promoters is critical for its function in repressing gene expression in murine embryonic stem cells (mESCs). However, previous studies have demonstrated that although the expression of early lineage-specific genes is largely repressed, the genome-wide PRC2 occupancy is unexpectedly reduced in naive mESCs. In this study, we provide evidence that fibroblast growth factor/extracellular signal-regulated kinase signaling determines the global PRC2 occupancy through regulating the expression of PRC2-recruiting factor JARID2 in naive mESCs. At the transcriptional level, the de-repression of bivalent genes is predominantly determined by the presence of cell signaling-associated transcription factors but not the status of PRC2 occupancy at gene promoters. Hence, this study not only reveals a key molecular mechanism by which cell signaling regulates the PRC2 occupancy in mESCs but also elucidates the functional roles of transcription factors and Polycomb-mediated epigenetic mechanisms in transcriptional regulation.Graphical AbstractDisplay OmittedHighlights•FGF/ERK signaling positively regulatesJarid2expression in mESCs•Reduced JARID2 causes global reduction of PRC2 occupancy in naive mESCs•Reduced PRC2 occupancy alone is insufficient to induce transcriptional activation•Cell signaling-associated transcription factors drive bivalent gene expressionMolecular Biology; Cell Biology; Stem Cells Research; Developmental Biology
