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Abstract H2AK119ub (H2Aub) and H3K27me3, which are deposited by the Polycomb group (PcG) complexes PRC1 and PRC2, respectively, cooperatively repress developmental genes. However, in human preimplantation embryos, H3K27me3 undergoes genome-wide erasure and subsequent restoration. How H3K27me3 is reestablished and whether PcG complexes still regulate gene repression in human embryos remain unknown. Here, we profiled H2Aub dynamics from human gametes to blastocysts.
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