纤维细胞直接重新编程到神经元的等级机制
Orly L Wapinski1, Thomas Vierbuchen, Kun Qu
1Howard Hughes Medical Institute and Program in Epithelial Biology, Stanford University, Stanford, CA 94305, USA; Program in Cancer Biology, Stanford University, Stanford, CA 94305, USA.
Cell
|November 19, 2013
概括
直接血统重编程使用转录因子来转换细胞. Ascl1开创了基因访问,招募了像Brn2这样的基因,使诱导的神经元 (iN) 细胞生成成为可能.
科学领域:
- 细胞生物学 细胞生物学
- 细胞重编程的分子机制
- 表观遗传学和基因调节
背景情况:
- 直接血统重编程为疾病建模和再生医学提供了潜力.
- 直接细胞转换的基础分子机制仍然不完全理解.
- 转录因子在指导细胞命运变化方面发挥着至关重要的作用.
研究的目的:
- 阐明直接纤维细胞对诱导的神经 (iN) 细胞重编程的等级机制.
- 确定关键的转录因子 (Ascl1, Brn2, Myt1l) 在这个过程中的作用.
- 了解染色质环境对重编程效率的影响.
主要方法:
- 研究了转录因子Ascl1,Brn2和Myt1l在直系重编程中的作用.
- 利用基因组位点占用测试来确定转录因子结合.
- 分析了染色体的特征,并确定了关键的基因,包括Zfp238.8.
主要成果:
- Ascl1作为一个先驱因素,启动纤维细胞中的染色质可访问性.
- Ascl1积极招募Brn2和Myt1l到特定的基因组部位进行重新编程.
- 一个三价染色体的签名预测了细胞的宽容性为Ascl1-介导的开拓者.
结论:
- 诱导神经元细胞的直接重编程遵循由先驱因素驱动的等级机制.
- 先驱因子,招募因子和染色质状态之间的相互作用对细胞命运转化至关重要.
- Zfp238是一种关键的Ascl1向基因,可以部分调节重编程,突出显示特定基因激活的重要性.
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