{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n ELF5 is a multifunctional transcription factor that plays a central role in determining cell fate in both early embryonic and mammary epithelial contexts. In the early embryo, ELF5 acts as a decisive gatekeeper of trophoblast lineage specification. Epigenetic repression of ELF5 in embryonic stem cells prevents trophoblast differentiation, whereas its de‐repression in DNA methylation–deficient cells permits activation of a trophoblast‐specific program through the establishment of a positive feedback loop with other key transcription factors (such as CDX2 and EOMES) that support trophoblast stem cell identity and self‐renewal (see."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In the mammary gland, ELF5 is indispensable for alveolar development and secretory differentiation during pregnancy. Conditional knockout studies have demonstrated that loss of ELF5 leads to failure of alveologenesis, diminished activation of signaling mediators such as Stat5, and an accumulation of undifferentiated or bipotent progenitor cells. Moreover, in the context of breast cancer, ELF5 also functions to restrict epithelial–mesenchymal transition by directly repressing EMT inducers like Snail2, thereby maintaining epithelial identity and limiting metastatic progression (see."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "5", "end_ref": "10"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Furthermore, hormonal cues, such as those delivered by prolactin and progesterone, modulate ELF5 expression to coordinate lineage commitment. In mammary epithelial progenitors, hormone‐induced ELF5 expression promotes alveolar maturation and differentiation while simultaneously acting to restrict stem/progenitor expansion. Together, these findings position ELF5 as a critical molecular switch that not only reinforces commitment to the trophoblast fate during early embryogenesis but also governs the differentiation and proper function of the secretory mammary epithelium.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ray Kit Ng, Wendy Dean, Claire Dawson, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "ELF5-enforced transcriptional networks define an epigenetically regulated trophoblast stem cell compartment in the human placenta."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Hum Mol Genet (2010)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1093/hmg/ddq128"}], "href": "https://doi.org/10.1093/hmg/ddq128"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "20354077"}], "href": "https://pubmed.ncbi.nlm.nih.gov/20354077"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Paulina A Latos, Arnold R Sienerth, Alexander Murray, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Elf5-centered transcription factor hub controls trophoblast stem cell self-renewal and differentiation through stoichiometry-sensitive shifts in target gene networks."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Genes Dev (2015)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1101/gad.268821.115"}], "href": "https://doi.org/10.1101/gad.268821.115"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "26584622"}], "href": "https://pubmed.ncbi.nlm.nih.gov/26584622"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Paulina A Latos, Angela Goncalves, David Oxley, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Fgf and Esrrb integrate epigenetic and transcriptional networks that regulate self-renewal of trophoblast stem cells."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Nat Commun (2015)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/ncomms8776"}], "href": "https://doi.org/10.1038/ncomms8776"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "26206133"}], "href": "https://pubmed.ncbi.nlm.nih.gov/26206133"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Rumela Chakrabarti, Julie Hwang, Mario Andres Blanco, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Elf5 inhibits the epithelial-mesenchymal transition in mammary gland development and breast cancer metastasis by transcriptionally repressing Snail2."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Nat Cell Biol (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/ncb2607"}], "href": "https://doi.org/10.1038/ncb2607"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "23086238"}], "href": "https://pubmed.ncbi.nlm.nih.gov/23086238"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Samantha R Oakes, Matthew J Naylor, Marie-Liesse Asselin-Labat, et al. 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