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GATA Transcription Factors, SOX17 and TFAP2C, Drive the Human Germ-cell Specification Program

Abstract

The in vitro reconstitution of human germ-cell development provides a robust framework for clarifying key underlying mechanisms. Here, we explored transcription factors (TFs) that engender the germ-cell fate in their pluripotent precursors. Unexpectedly, , , and , which act under the BMP signaling and are indispensable for human primordial germ-cell-like cell (hPGCLC) specification, failed to induce hPGCLCs. In contrast, or , immediate BMP effectors, combined with and , generated hPGCLCs. / knockouts dose-dependently impaired BMP-induced hPGCLC specification, whereas / expression remained unaffected in , , or knockouts. In cynomolgus monkeys, a key model for human development, , , and were co-expressed exclusively in early PGCs. Crucially, the TF-induced hPGCLCs acquired a hallmark of bona fide hPGCs to undergo epigenetic reprogramming and mature into oogonia/gonocytes in xenogeneic reconstituted ovaries. By uncovering a TF circuitry driving the germ line program, our study provides a paradigm for TF-based human gametogenesis.

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