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To understand the epigenetic foundation of naïve pluripotent cells, we implement a quantitative multiplexed ChIP-Seq method (MINUTE-ChIP) comparing mouse ESC grown in 2i versus Serum conditions. Combined with quantitative western blot and mass spectrometry, we find compelling evidence for a broad H3K27me3 hypermethylation of the genome, concomitant with the widespread loss of DNA CpG methylation. We show that opposing action of EZH2 and JMJD3/UTX shape the H3K27me3 landscape, with almost alldoi:10.1101/557082 fatcat:swdjl2m5svhezbhc4upe6nuvwy