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• W2095829772 abstract "The T-cell oncogene Lim-only 2 (LMO2) critically influences both normal and malignant haematopoiesis. LMO2 is not normally expressed in T cells, yet ectopic expression is seen in the majority of T-acute lymphoblastic leukaemia (T-ALL) patients with specific translocations involving LMO2 in only a subset of these patients. Ectopic lmo2 expression in thymocytes of transgenic mice causes T-ALL, and retroviral vector integration into the LMO2 locus was implicated in the development of clonal T-cell disease in patients undergoing gene therapy. Using array-based chromatin immunoprecipitation, we now demonstrate that in contrast to B-acute lymphoblastic leukaemia, human T-ALL samples largely use promoter elements with little influence from distal enhancers. Active LMO2 promoter elements in T-ALL included a previously unrecognized third promoter, which we demonstrate to be active in cell lines, primary T-ALL patients and transgenic mice. The ETS factors ERG and FLI1 previously implicated in lmo2-dependent mouse models of T-ALL bind to the novel LMO2 promoter in human T-ALL samples, while in return LMO2 binds to blood stem/progenitor enhancers in the FLI1 and ERG gene loci. Moreover, LMO2, ERG and FLI1 all regulate the +1 enhancer of HHEX/PRH, which was recently implicated as a key mediator of early progenitor expansion in LMO2-driven T-ALL. Our data therefore suggest that a self-sustaining triad of LMO2/ERG/FLI1 stabilizes the expression of important mediators of the leukaemic phenotype such as HHEX/PRH." @default.
• W2095829772 created "2016-06-24" @default.
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• W2095829772 date "2010-08-02" @default.
• W2095829772 modified "2023-10-10" @default.
• W2095829772 title "A previously unrecognized promoter of LMO2 forms part of a transcriptional regulatory circuit mediating LMO2 expression in a subset of T-acute lymphoblastic leukaemia patients" @default.
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• W2095829772 doi "https://doi.org/10.1038/onc.2010.320" @default.
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