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相关概念视频

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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Maintenance of the ES Cell State01:14

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The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
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Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
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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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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.
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相关实验视频

Updated: Jan 12, 2026

Oct4GiP Reporter Assay to Study Genes that Regulate Mouse Embryonic Stem Cell Maintenance and Self-renewal
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在多能干细胞和小鼠胚胎发生过程中剖析Oct4增强剂的功能.

Daniel A Schmitz1, Daiji Okamura2, Masahiro Sakurai1

  • 1Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

Stem cell reports
|November 7, 2025
PubMed
概括

远端 (DE) 和近端 (PE) 增强剂控制OCT4基因表达. 对于纯粹的多能性来说,DE至关重要,而对于初始化的多能性来说,PE至关重要,这两者都对胚胎发育至关重要.

关键词:
经合组织CT4在POU5F1F1中.喜梅拉斯 (Chimeras) 是一种幻象.增强剂是一种增强剂.形成性的多能性.纯粹的多能性是一种天真的多能性.多能干细胞是一种多能干细胞.预备中的多能性.

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相关实验视频

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科学领域:

  • 发展生物学 发展生物学
  • 干细胞生物学 干细胞生物学
  • 基因规则 基因规则

背景情况:

  • OCT4是多能性的关键调节剂,对多能干细胞 (PSC) 和生殖细胞至关重要.
  • 它的表达受到两个cis调节元件的控制:远端增强剂 (DE) 和近端增强剂 (PE).
  • 对于DE和PE在多能性和发育中的精确生物功能,人们对其了解尚不完全.

研究的目的:

  • 调查Oct4DE和PE在维持不同的多能状态 (天真与原始) 中的不同角色.
  • 阐明这些增强剂在胚胎早期发育期间对Oct4表达的必要性.
  • 为了生成新的PSC线和小鼠模型来研究Oct4调节.

主要方法:

  • 产生PSC线和小鼠模型,有针对性地删除Oct4DE和PE.
  • 在体外 (in vitro) 评估多能状态 (原始和原始).
  • 在体内对神象和胚胎发育的贡献的评估.

主要成果:

  • 对于原始化的多能状态来说,DE是不可用的,但对于天真状态来说是必需的.
  • 对于初始化状态来说,PE是必要的,但对于初始化状态来说却不是必要的.
  • 缺乏PE的天真PSC可以在体外分化并形成嵌合体,但在体内删除任何一种增强剂会导致早期胚胎致死性.

结论:

  • Oct4DE和PE在调节多能性和早期胚胎发育方面发挥着独特而至关重要的作用.
  • 这些发现突出了对增强剂的差异性需求,用于原始和原始化的多能性.
  • 开发的遗传模型为剖析在发育过程中的Oct4调节提供了有价值的工具.