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Learn MoreCells belonging to trophoblast lineage are required for proper implantation and placentation, as well as the vascular, hematopoietic, and immunological properties of the placenta, a crucial organ mediating dynamic interactions between maternal and fetal tissues. Defects in trophoblast lineage development can cause early pregnancy failure or other pregnancy-related disorders. Despite its pivotal roles, the placenta remains as one of the least studied organs. Until now, only a handful of trophoblast-specific transcription factors (TFs) have been characterized, and underlying regulatory mechanisms modulating trophoblast lineage development remain poorly understood. Here we explore trophoblast stem cell (TSC)-specific super-enhancers (SEs) and subsequently identify SE-associated factors enriched with previously known and many unknown TFs modulating trophoblast lineage development. By mapping direct targets of 28 TSC-specific TFs in TSCs, we construct highly intertwined transcriptional regulatory networks where TFs are co-regulated and linked with signaling pathways, and which function as cellular modules dedicated to trophoblast lineage development. Additionally, we reveal that TSC-specific TFs alter their target sites corresponding to the reshaped enhancers during TSC differentiation. These findings advance our understanding on placenta biology. SOURCE: Bum-Kyu Lee (bklee92@gmail.com) - University of Texas at Austin
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