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相关概念视频

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Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for...
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Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
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Nuclear reprogramming is the process of switching gene expression of one cell type to that of another cell type, usually from a differentiated cell state to an undifferentiated cell state. Differentiation occurs during processes such as development and morphogenesis, tissue regeneration, and malignancy. Cells can also be artificially induced to reprogram their gene expression by techniques such as nuclear transfer, induced pluripotency, and cell fusion. Such techniques have many applications in...
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使用单细胞RNA-seq从纤维细胞直接重编程

Barbara Treutlein1,2, Qian Yi Lee1,3,4, J Gray Camp5

  • 1Department of Bioengineering, Stanford University, Stanford, California 94305, USA.

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概括

直接血统重编程转换细胞状态, 但中间步骤是不清楚的. 这项研究揭示了从纤维细胞到神经元的连续重编程路径,确定了关键因素和效率限制.

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科学领域:

  • 细胞重编程
  • 发育生物学
  • 转录组学

背景情况:

  • 直接血统重编程可以转换细胞类型,
  • 了解这些转变对于控制细胞命运和再生医学至关重要.

研究的目的:

  • 在从小鼠胚胎纤维细胞直接重新编程到诱导的神经细胞时剖析中间细胞和转录组状态.
  • 确定限制直系转换效率的因素.

主要方法:

  • 在多个时间点应用单细胞RNA测序 (scRNA-seq).
  • 基于转录组相似性的细胞的计算排序,以重建动态路径.
  • 对基因表达模式和细胞周期退出的分析.

主要成果:

  • 确定了一个连续的重编程分子路径,从Ascl1驱动的初始化开始.
  • 早期的转录反应是均的,但后来的阶段显示出具有竞争力的肌性程序和可变的转基因动态限制了效率.
  • 在生产性重编程过程中观察到明显的短暂转录状态.

结论:

  • 重编程路径是连续的,早期步骤是强大的,后期阶段受到竞争程序和转基因稳定性的限制.
  • 这种高分辨率的方法增强了对谱系分化和重编程过程中的转录组动态的理解.