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- W2016316813 abstract "ABSTRACT The transcription factor PU.1 is critical for multiple hematopoietic lineages, but different leukocyte types require strictly distinct patterns of PU.1 regulation. PU.1 is required early for T-cell lineage development but then must be repressed by a stage-specific mechanism correlated with commitment. Other lineages require steady, low expression or upregulation. Until now, only the promoter plus a distal upstream regulatory element (URE) could be invoked to explain nearly all Sfpi1 (PU.1) activation and repression, including bifunctional effects of Runx1. However, the URE is dispensable for most Sfpi1 downregulation in early T cells, and we show that it retains enhancer activity in immature T-lineage cells even where endogenous Sfpi1 is repressed. We now present evidence for another complex of conserved noncoding elements that mediate discrete, cell-type-specific regulatory features of Sfpi1 , including a myeloid cell-specific activating element and a separate, pro-T-cell-specific silencer element. These elements yield opposite, cell-type-specific responses to Runx1. T-cell-specific repression requires Runx1 acting through multiple nonconsensus sites in the silencer core. These newly characterized sites recruit Runx1 binding in early T cells in vivo and define a functionally specific scaffold for dose-dependent, Runx-mediated repression." @default.
- W2016316813 created "2016-06-24" @default.
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- W2016316813 date "2010-10-15" @default.
- W2016316813 modified "2023-09-27" @default.
- W2016316813 title "Cell-Type-Specific Activation and Repression of PU.1 by a Complex of Discrete, Functionally Specialized <i>cis</i> -Regulatory Elements" @default.
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- W2016316813 doi "https://doi.org/10.1128/mcb.00354-10" @default.
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