Olig2 targets chromatin remodelers to enhancers to initiate oligodendrocyte differentiation.

Olig2 targets chromatin remodelers to enhancers to initiate oligodendrocyte differentiation.
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Olig2 将染色质重塑剂靶向增强剂以启动少突胶质细胞分化

DOI:
10.1016/j.cell.2012.12.006
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发表时间:
2013-01-17
期刊:
影响因子:
64.5
通讯作者:
Lu QR
Lu QR
中科院分区:
生物学1区
文献类型:
--
作者:
Yu Y;Chen Y;Kim B;Wang H;Zhao C;He X;Liu L;Liu W;Wu LM;Mao M;Chan JR;Wu J;Lu QR

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少突胶质细胞身份的建立对于中枢神经系统 (CNS) 中髓鞘形成的后续事件至关重要。在这里,我们证明,在分化开始时激活 ATP 依赖性 SWI/SNF 染色质重塑酶 Smarca4/Brg1 对于启动和促进少突胶质细胞谱系进展和成熟是必要且充分的。 ChIP-seq 进行的全基因组多阶段研究表明,少突胶质细胞谱系决定因子 Olig2 作为预模式因子,将 Smarca4/Brg1 引导至少突胶质细胞特异性增强子。 Smarca4/Brg1 招募到髓鞘形成调控基因的不同子集是受发育调控的。对 Smarca4/Brg1 和 Olig2 共占用相对于染色质表观遗传标记的功能分析揭示了新的阶段特异性顺式调节元件,这些元件可预测控制少突胶质细胞分化的转录调节因子组。总之,我们的结果表明,Olig2 对 Smarca4/Brg1 依赖性染色质重塑复合物的功能特异性和活性的调节,加上转录相关的染色质修饰,对于精确启动和建立促进少突胶质细胞分化和随后中枢神经系统髓鞘化的转录程序至关重要。
Establishment of oligodendrocyte identity is crucial for subsequent events of myelination in the central nervous system (CNS). Here, we demonstrate that activation of ATP-dependent SWI/SNF chromatin-remodeling enzyme Smarca4/Brg1 at the differentiation onset is necessary and sufficient to initiate and promote oligodendrocyte lineage progression and maturation. Genome-wide multistage studies by ChIP-seq reveal that oligodendrocyte-lineage determination factor Olig2 functions as a pre-patterning factor to direct Smarca4/Brg1 to oligodendrocyte-specific enhancers. Recruitment of Smarca4/Brg1 to distinct subsets of myelination regulatory genes is developmentally regulated. Functional analyses of Smarca4/Brg1 and Olig2 co-occupancy relative to chromatin epigenetic marking uncover novel stage-specific cis-regulatory elements that predict sets of transcriptional regulators controlling oligodendrocyte differentiation. Together, our results demonstrate that regulation of the functional specificity and activity of a Smarca4/Brg1-dependent chromatin-remodeling complex by Olig2, coupled with transcriptionally-linked chromatin modifications, is critical to precisely initiate and establish the transcriptional program that promotes oligodendrocyte differentiation and subsequent myelination of the CNS.
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