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相关概念视频

Chromatin Structure Regulates pre-mRNA Processing02:41

Chromatin Structure Regulates pre-mRNA Processing

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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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The 3-dimensional positioning of chromatin in the nucleus influences the...
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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Nucleosome Remodeling02:54

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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.
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相关实验视频

Updated: May 16, 2025

CRISPR-Mediated Reorganization of Chromatin Loop Structure
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CTCF-RNA相互作用编排细胞特异性染色质循环组织.

Kimberly Lucero1,2, Sungwook Han2,3,4, Pin-Yao Huang2

  • 1Department of Cell Biology and Regenerative Medicine, New York University Langone Medical Center, New York, NY, USA.

bioRxiv : the preprint server for biology
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PubMed
概括
此摘要是机器生成的。

在细胞分化过程中,CCCCTC结合因子 (CTCF) RNA相互作用对于维持基因组结构至关重要. 破坏CTCF的行为

关键词:
在CTCF中,CTCF是指CTCF.有关RNA结合的RNA.染色质环节是染色质的环节.胚胎干细胞是一种胚胎干细胞.基因表达的基因表达方式基因组组织组织神经前代细胞的神经前代细胞

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科学领域:

  • 基因组学就是基因组学.
  • 分子生物学分子生物学
  • 细胞生物学 细胞生物学

背景情况:

  • CCCTC结合因子 (CTCF) 在染色质组织中起着关键作用.
  • CTCF与内源RNA相互作用,其ZF1RNA结合区域对于小鼠胚胎干细胞 (ESC) 中的染色蛋白循环形成很重要.
  • 在细胞分化过程中CTCF-ZF1RNA相互作用的功能意义在很大程度上是未知的.

研究的目的:

  • 研究CTCF-ZF1RNA相互作用在分化过程中维持细胞类型特定的染色质组织中的作用.
  • 阐明破坏CTCF-ZF1RNA相互作用对基因调节和细胞身份的功能后果.

主要方法:

  • 利用ESC分化成神经前代细胞 (NPC) 的体外模型.
  • 生成的细胞表达CTCF突变,缺少ZF1RNA结合区域 (CTCF-ΔZF1).
  • 识别和表征了与CTCF-ZF1.1相互作用的NPC特定RNA.
  • 评估了切断特定相互作用RNA (Podxl,Grb10) 对染色质循环的影响.

主要成果:

  • 在NPC分化过程中,CTCF-ZF1对于保持细胞类型特定的染色质循环至关重要.
  • CTCF-ΔZF1的表达破坏了染色质循环和参与神经元发育的失调基因.
  • 切断NPC特异性RNAs,Podxl和Grb10,模仿了CTCF-ΔZF1效应,通过破坏cis中的染色质环.

结论:

  • 在分化过程中,CTCF-ZF1RNA相互作用对于维持基因组结构和细胞身份至关重要.
  • 这些相互作用确保了细胞类型特定的基因表达程序的适当调节.