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- W2437490503 abstract "The histone methyltransferase DOT1L and the chromatin reader BRD4 together facilitate transcription of genes critical to the molecular pathogenesis of MLL leukemia. Targeted therapies against disruptor of telomeric silencing 1-like (DOT1L) and bromodomain-containing protein 4 (BRD4) are currently being evaluated in clinical trials. However, the mechanisms by which BRD4 and DOT1L regulate leukemogenic transcription programs remain unclear. Using quantitative proteomics, chemoproteomics and biochemical fractionation, we found that native BRD4 and DOT1L exist in separate protein complexes. Genetic disruption or small-molecule inhibition of BRD4 and DOT1L showed marked synergistic activity against MLL leukemia cell lines, primary human leukemia cells and mouse leukemia models. Mechanistically, we found a previously unrecognized functional collaboration between DOT1L and BRD4 that is especially important at highly transcribed genes in proximity to superenhancers. DOT1L, via dimethylated histone H3 K79, facilitates histone H4 acetylation, which in turn regulates the binding of BRD4 to chromatin. These data provide new insights into the regulation of transcription and specify a molecular framework for therapeutic intervention in this disease with poor prognosis." @default.
- W2437490503 created "2016-06-24" @default.
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- W2437490503 date "2016-06-13" @default.
- W2437490503 modified "2023-10-15" @default.
- W2437490503 title "Functional interdependence of BRD4 and DOT1L in MLL leukemia" @default.
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