1. MicroRNAs Induce a Permissive Chromatin Environment that Enables Neuronal Subtype-Specific Reprogramming of Adult Human Fibroblasts.
- Author
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Abernathy DG, Kim WK, McCoy MJ, Lake AM, Ouwenga R, Lee SW, Xing X, Li D, Lee HJ, Heuckeroth RO, Dougherty JD, Wang T, and Yoo AS
- Subjects
- Adult, Cell Lineage genetics, Cells, Cultured, Chromatin Assembly and Disassembly genetics, DNA Methylation genetics, Electrophysiological Phenomena, Epigenesis, Genetic, Gene Expression Profiling, Heterochromatin metabolism, Humans, MicroRNAs genetics, Motor Neurons cytology, Motor Neurons metabolism, Neurogenesis genetics, Neurons metabolism, Spinal Cord cytology, Time Factors, Transcription, Genetic, Transcriptional Activation genetics, Cellular Reprogramming genetics, Chromatin metabolism, Fibroblasts cytology, MicroRNAs metabolism, Neurons cytology
- Abstract
Directed reprogramming of human fibroblasts into fully differentiated neurons requires massive changes in epigenetic and transcriptional states. Induction of a chromatin environment permissive for acquiring neuronal subtype identity is therefore a major barrier to fate conversion. Here we show that the brain-enriched miRNAs miR-9/9
∗ and miR-124 (miR-9/9∗ -124) trigger reconfiguration of chromatin accessibility, DNA methylation, and mRNA expression to induce a default neuronal state. miR-9/9∗ -124-induced neurons (miNs) are functionally excitable and uncommitted toward specific subtypes but possess open chromatin at neuronal subtype-specific loci, suggesting that such identity can be imparted by additional lineage-specific transcription factors. Consistently, we show that ISL1 and LHX3 selectively drive conversion to a highly homogeneous population of human spinal cord motor neurons. This study shows that modular synergism between miRNAs and neuronal subtype-specific transcription factors can drive lineage-specific neuronal reprogramming, providing a general platform for high-efficiency generation of distinct subtypes of human neurons., (Copyright © 2017 Elsevier Inc. All rights reserved.)- Published
- 2017
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