{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nTAL1 (also known as SCL) is a master transcriptional regulator that orchestrates normal hematopoiesis and mesoderm‐derived lineage specification. In normal blood development, TAL1 is essential for the proper specification, maintenance, and differentiation of hematopoietic stem and progenitor cells as well as for the maturation of erythroid and megakaryocytic lineages. By binding to thousands of regulatory elements—including classic enhancers, super‐enhancers, and looping hubs that govern loci such as c‐kit, γ‐globin, and other blood‐specific genes—TAL1 establishes dynamic combinatorial complexes in concert with partners such as GATA factors, E-proteins, LMO2, and others. In addition, TAL1 function is fine-tuned by alternative RNA splicing and post-translational modifications (for example, caspase-mediated cleavage, phosphorylation-dependent interactions with LSD1/HDAC complexes, and regulation via chromatin looping) that help coordinate transitions from early progenitors to terminal erythroid differentiation and even influence related processes such as megakaryocyte and platelet production, as well as nonhematopoietic events including aspects of myogenic differentiation. These studies, carried out in cellular systems ranging from primary human megakaryocytes and CD34⁺ cells to hPSC-derived blood cells and in vivo mouse models, underscore the pivotal role of TAL1 in normal blood formation and lineage fidelity."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "22"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn contrast, deregulated expression and misappropriation of TAL1 activity play central roles in T-cell leukemogenesis and other oncogenic contexts. In T-cell acute lymphoblastic leukemia (T-ALL), aberrant TAL1 activation—often driven by genetic alterations that create novel super-enhancers or by disrupted miRNA/lncRNA regulatory networks—reprograms transcriptional circuitry through interconnected autoregulatory and feed-forward loops involving partners such as GATA3, RUNX1, MYB, and E-proteins. These oncogenic TAL1-containing complexes activate target genes (including, for example, miR-223 and NKX3.1), remodel chromatin architecture, and modulate signaling pathways (for instance, by affecting NF-κB activity and responses to TGF-β or histone deacetylase inhibitors) to sustain the malignant phenotype. Collectively, these studies delineate how TAL1’s interaction with cooperative factors—as well as its regulation by post-translational modifications and non-coding RNA networks—contributes to its dual role as a critical regulator in normal hematopoiesis and as an oncogenic driver in T-ALL."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "23", "end_ref": "37"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Eric Lécuyer, Sabine Herblot, Marianne Saint-Denis, et al. 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