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Eomesodermin in conjunction with the BAF complex promotes expansion and invasion of the trophectoderm lineage

Author

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  • Alexandra Maria Bisia

    (University of Oxford)

  • Maria-Eleni Xypolita

    (University of Oxford)

  • Elizabeth K. Bikoff

    (University of Oxford)

  • Elizabeth J. Robertson

    (University of Oxford)

  • Ita Costello

    (University of Oxford)

Abstract

The T-box transcription factor (TF) Eomesodermin/Tbr2 (Eomes) is essential for maintenance of the trophectoderm (TE) lineage, but the molecular mechanisms underlying this critical role remain obscure. Here, we show in trophoblast stem cells (TSCs) that Eomes partners with several TE-specific TFs as well as chromatin remodellers, including Brg1 and other subunits of the BAF complex. Degron-mediated Eomes protein depletion results in genome-wide loss of chromatin accessibility at TSC-specific loci. These overlap with a subset of sites that lose accessibility following Brg1 inhibition, suggesting that Eomes acts as a “doorstop” controlling TSC chromatin accessibility. Eomes depletion also causes transcriptional misregulation of TSC maintenance and early differentiation markers. An additional subset of Eomes-dependent genes encode intercellular/matricellular interaction and cytoskeletal components, likely explaining the implantation defects of Eomes-null embryos. Thus, Eomes promotes TE lineage maintenance by sustaining trophectoderm-specific chromatin accessibility, while promoting the gene regulatory networks that modulate expansion and cell behaviour during implantation.

Suggested Citation

  • Alexandra Maria Bisia & Maria-Eleni Xypolita & Elizabeth K. Bikoff & Elizabeth J. Robertson & Ita Costello, 2025. "Eomesodermin in conjunction with the BAF complex promotes expansion and invasion of the trophectoderm lineage," Nature Communications, Nature, vol. 16(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-60417-w
    DOI: 10.1038/s41467-025-60417-w
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