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相关概念视频

Chromatin Modification in iPS Cells01:32

Chromatin Modification in iPS Cells

1.9K
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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Nucleosome Remodeling02:54

Nucleosome Remodeling

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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
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Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
8.5K
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...
2.3K
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...
1.9K
Histone Modification02:32

Histone Modification

14.1K
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
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相关实验视频

Updated: Sep 15, 2025

Efficient Differentiation of Pluripotent Stem Cells to NKX6-1+ Pancreatic Progenitors
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染色体重塑蛋白CHD4与NKX2.2合作,调节胰腺β细胞完整性.

Dylan K Sarbaugh1, Thais Gaia Oliveira1, Michelle A Guney1

  • 1Barbara Davis Center for Diabetes, University of Colorado Anschutz Medical Campus, Aurora, CO 80045.

bioRxiv : the preprint server for biology
|July 16, 2025
PubMed
概括

染色体螺旋酶DNA结合蛋白4 (CHD4) 对于胰腺β细胞功能至关重要. 失去CHD4会影响β细胞的成熟和功能,导致小鼠糖尿病.

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科学领域:

  • 内分泌学 在内分泌学.
  • 分子生物学分子生物学
  • 遗传学 遗传学 是一个

背景情况:

  • NKX2.2是胰腺岛贝塔 (β) 细胞身份和功能的关键转录因子.
  • 在β细胞中调节NKX2.2活性的辅因子蛋白仍然在很大程度上没有表征.
  • 染色体螺旋酶DNA结合蛋白4 (CHD4) 是一个核体重塑剂,参与各种细胞类型的基因调节.

研究的目的:

  • 为了识别胰腺β细胞中的NKX2.2相互作用伙伴.
  • 研究CHD4在β细胞成熟和功能中的作用,无论是依赖NKX2.2.2.还是独立于NKX2.2.2.
  • 为了生成和分析条件淘汰赛小鼠缺乏Chd4特别在β细胞 (Chd4βKO).

主要方法:

  • 无偏的蛋白质组学选识别NKX2.2相互作用蛋白质.
  • 在β细胞中生成Chd4βKO小鼠用于条件基因删除.
  • 在Chd4βKO小鼠中评估β细胞形态,功能,葡萄糖平衡,胰岛素分泌和信号.

主要成果:

  • 蛋白质组学将CHD4确定为NKX2.2的相互作用伙伴.
  • β细胞中的Chd4缺失导致小岛的完整性,成熟和功能受损.
  • Chd4βKO小鼠表现出早期发病的糖尿病,其特征是受葡萄糖刺激的胰岛素分泌和信号的干扰.
  • 在Chd4缺乏β细胞中观察到基本β细胞调节基因的下调.

结论:

  • 在胰腺β细胞中,CHD4充当NKX2.2的重要转录辅因子.
  • CHD4对于胰腺β细胞的适当成熟和持续功能至关重要.
  • 在β细胞中CHD4功能的破坏导致糖尿病表型.