Abstract
Conventional human embryonic stem cells (hESCs) are capable of self-renewal and simultaneously poised for differentiation. But the mechanisms underlying this primed pluripotent state, which endows them with elevated responsiveness to differentiation cues, remain largely underexplored. Especially, little is known about the pivotal transcription factors (TFs) that orchestrate hESCs towards primed pluripotency. Here, we report a function of TF ZNF263 in pluripotency priming. Genetic and functional assays reveal that ZNF263 directly initiates the incipient expression of early differentiation genes and concurrently dampens the core pluripotency circuitry in hESCs, greatly tilting the balance from pluripotency maintenance to lineage priming. Importantly, ZNF263 deficiency markedly impairs pluripotency dissolution and multi-lineage differentiation in hESCs, particularly toward ectoderm. Moreover, single-cell transcriptomic profiling reveals that ZNF263 promotes the priming of cell fate commitment in hESCs, suggesting its indispensable requirement for pluripotency priming and lineage commitment continuum. Together, we demonstrate the role of ZNF263 in establishing the primed pluripotent state in hESCs and facilitating their differentiation into primary germ layer lineages.