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ASCL1 Reorganizes Chromatin to Direct Neuronal Fate and Suppress Tumorigenicity of Glioblastoma Stem Cells.

Cell stem cell | 2017

Glioblastomas exhibit a hierarchical cellular organization, suggesting that they are driven by neoplastic stem cells that retain partial yet abnormal differentiation potential. Here, we show that a large subset of patient-derived glioblastoma stem cells (GSCs) express high levels of Achaete-scute homolog 1 (ASCL1), a proneural transcription factor involved in normal neurogenesis. ASCL1GSCs exhibit a latent capacity for terminal neuronal differentiation in response to inhibition of Notch signaling, whereas ASCL1GSCs do not. Increasing ASCL1 levels in ASCL1GSCs restores neuronal lineage potential, promotes terminal differentiation, and attenuates tumorigenicity. ASCL1 mediates these effects by functioning as a pioneer factor at closed chromatin, opening new sites to activate a neurogenic gene expression program. Directing GSCs toward terminal differentiation may provide therapeutic applications for a subset of GBM patients and strongly supports efforts to restore differentiation potential in GBM and other cancers.

Pubmed ID: 28712938 RIS Download

Mesh terms: Base Sequence | Basic Helix-Loop-Helix Transcription Factors | Brain Neoplasms | Carcinogenesis | Cell Differentiation | Cell Lineage | Chromatin | Disease Progression | Enhancer Elements, Genetic | Gene Expression Regulation, Neoplastic | Glioblastoma | Humans | Neoplastic Stem Cells | Neurons | Promoter Regions, Genetic | Protein Binding | Sequence Analysis, RNA | Up-Regulation

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