{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nLMO2 is a critical transcriptional cofactor whose aberrant expression reprograms committed T‐cells by reactivating stem cell–associated gene expression programs. In several studies, ectopic LMO2 expression in thymocytes was shown to induce long‐term self‐renewal and to predispose these preleukemic cells to acquire additional oncogenic mutations that culminate in T‐cell acute lymphoblastic leukemia (T‐ALL), even in contexts such as gene therapy adverse events. Notably, while LMO2 is dispensable for normal T‐ and B‐cell development, its enforced expression initiates a stem cell–like state that cooperates with other oncogenic signals such as mutant Notch1 or loss of tumor suppressors, thereby driving the emergence of aggressive, self‐renewing leukemic populations."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the molecular level, LMO2 functions as a bridging factor that nucleates the assembly of multiprotein transcription complexes by interacting with key partners such as SCL/TAL1, Lyl1, GATA factors, and the LIM‐domain binding protein Ldb1. This interaction not only mediates DNA targeting via associated DNA‐binding partners but also stabilizes LMO2 against proteasomal degradation. Furthermore, chromatin mapping experiments have revealed that LMO2 binds to distinct enhancer elements and participates in long‐range chromatin looping to ensure high‐level, context‑specific expression in both hematopoietic and endothelial cells."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its role in hematopoiesis and leukemogenesis, dysregulated LMO2 activity has also been implicated in other developmental and pathological contexts, including the regulation of endothelial cell function and angiogenesis. In preclinical models, modulation of LMO2 or its downstream targets (for example, HHEX) has shown promise in correcting aberrant self‐renewal and in overcoming resistance associated with leukemia‑initiating cells, thereby highlighting its potential as a therapeutic target."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "19"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Matthew P McCormack, Lauren F Young, Sumitha Vasudevan, et al. 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