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相关概念视频

Methods of Nuclear Reprogramming01:24

Methods of Nuclear Reprogramming

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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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Alternative RNA Splicing02:18

Alternative RNA Splicing

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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
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Somatic to iPS Cell Reprogramming01:29

Somatic to iPS Cell Reprogramming

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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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Chromatin Modification in iPS Cells01:32

Chromatin Modification in iPS Cells

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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
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Multipotency of Hematopoietic Stem Cells01:19

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The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
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Combinatorial Gene Control02:33

Combinatorial Gene Control

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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
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相关实验视频

Updated: Jun 24, 2025

RNA-based Reprogramming of Human Primary Fibroblasts into Induced Pluripotent Stem Cells
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通过结合体抑制捕获人体细胞中的多能性

Shiyu Li1, Min Yang1, Hui Shen1

  • 1MOE Key Laboratory of Cell Proliferation and Differentiation, School of Life Sciences, Peking University, Beijing 100871, China.

Cell
|June 6, 2024
PubMed
概括

研究人员通过重新编程干细胞培养了人体全能母细胞类细胞 (hTBLC). 这些hTBLC模仿了早期人类的发育,并可以形成类似胚囊的结构,从而提供对全能性的见解.

关键词:
类似ZGA的细胞类似胚囊的结构细胞质体多能性合抑制干细胞培养对于强度全能芽细胞类细胞细胞基因组激活

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相关实验视频

Last Updated: Jun 24, 2025

RNA-based Reprogramming of Human Primary Fibroblasts into Induced Pluripotent Stem Cells
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科学领域:

  • 发育生物学
  • 干细胞生物学
  • 遗传学

背景情况:

  • 通过胚胎基因组激活 (ZGA) 来启动人类发育,产生的全能芽细胞是至关重要的.
  • 在实验室中维持人类细胞的全能性存在重大挑战.
  • 现有的模型,如8细胞类细胞 (8CLCs),在完全复制的全能性方面存在局限性.

研究的目的:

  • 建立一种培养人类全能母细胞样细胞 (hTBLC) 的方法.
  • 研究这些新型hTBLC的特性和发展潜力.
  • 为实现和理解人类细胞全能性提供标准和见解.

主要方法:

  • 使用拼接抑制重新编程人类多能干细胞以产生类似ZGA的细胞 (ZLC).
  • 长期传递ZLC以建立稳定的hTBLC.
  • 基因表达特征,包括多能性和ZGA特异性基因.
  • 在体外评估hTBLC的分化潜力.

主要成果:

  • 在长时间培养后稳定为hTBLCs.
  • ZLC 和 hTBLC 都表现出广泛的多能基因沉默.
  • ZLCs激活了ZGA特异性基因,而hTBLCs显示了ZGA前基因的丰富.
  • hTBLCs成功地重现了人类植入前的发育,产生了表皮质 (EPI),原始内皮质 (PrE) 和皮质 (TE) 类似的血统.
  • 在体外,hTBLCs自主形成了类似胚囊的结构,显示出胚胎和胚胎外的发育能力.

结论:

  • 这项研究成功地确定和表征了人类全能芽细胞 (hTBLC).
  • 对于研究人类的全能性和早期发育来说,hTBLC 是一个有价值的模型.
  • 这些发现为实现和理解人类细胞全能性提供了关键的见解和标准.