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相关概念视频

Epigenetic Regulation01:37

Epigenetic Regulation

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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
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Epigenetic Regulation01:46

Epigenetic Regulation

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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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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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Genomic Imprinting and Inheritance02:30

Genomic Imprinting and Inheritance

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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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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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相关实验视频

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Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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在活体中编辑DNA甲基化.

Richard Pan1, Jingwei Ren1, Xinyue Chen1

  • 1Department of Physiology and Cellular Biophysics, Columbia University Irving Medical Center, Columbia University, New York City, NY, USA.

Nature communications
|December 10, 2025
PubMed
概括
此摘要是机器生成的。

研究人员开发了新的小鼠模型,用于精确的体内DNA甲基化编辑. 这种技术成功地改变了基因表达,影响了胆固醇水平,并拯救了神经疾病,显示了表观遗传学研究的前景.

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科学领域:

  • 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
  • 分子生物学分子生物学
  • 遗传学 是一个遗传学.

背景情况:

  • 基因甲基化是基因表达的关键表观遗传调节剂.
  • 目前的DNA甲基化编辑工具在很大程度上仅限于体外应用,因为交付挑战.

研究的目的:

  • 开发和验证一种可诱导,组织特异的DNA甲基化编辑系统.
  • 为了证明向DNA甲基化和脱甲基化在生物体中的功能后果.

主要方法:

  • 产生表达可诱导dCas9-DNMT3A (用于甲基化) 和dCas9-TET1 (用于脱甲基化) 编辑器的转基因小鼠线.
  • 在体内对特定基因促进体 (Psck9 和 Mecp2) 进行有针对性的表观遗传编辑.
  • 通过测序评估基因表达变化,生理结果 (血清胆固醇,神经元形态),以及全基因组的非目标效应.

主要成果:

  • 在dCas9-DNMT3A小鼠中,Psck9促进体的向甲基化减少了Pcsk9的表达,并降低了血清LDL胆固醇.
  • 在dCas9-TET1小鼠中对Mecp2促进体的向去甲基化重新激活了X染色体表达,并在Mecp2+/-小鼠中挽救了神经元缺陷.
  • 全基因组分析证实了最小的转录异位效应,突出显示了该系统的特异性.

结论:

  • 开发的基于dCas9的可诱导编辑器可以在体内进行精确和组织特定的DNA甲基化编辑.
  • 这项技术提供了一个多功能平台,用于在复杂的生物过程和疾病模型中询问DNA甲基化在复杂生物过程和疾病模型中的功能作用.