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相关概念视频

Inheritance of Chromatin Structures03:17

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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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Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
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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.
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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.
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...
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相关实验视频

Updated: Sep 28, 2025

An Integrated Platform for Genome-wide Mapping of Chromatin States Using High-throughput ChIP-sequencing in Tumor Tissues
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在完整的人类基因组中的表观遗传模式

Ariel Gershman1, Michael E G Sauria2, Xavi Guitart3

  • 1Department of Molecular Biology and Genetics, Johns Hopkins University, Baltimore, MD, USA.

Science (New York, N.Y.)
|March 31, 2022
PubMed
概括
此摘要是机器生成的。

T2T-CHM13基因组参考提供了以前未解决的人类DNA序列的高分辨率表观遗传图. 这项研究揭示了复杂基因区域的基因活动和调节的洞察力.

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科学领域:

  • 基因组学
  • 表观遗传学
  • 人类遗传学

背景情况:

  • 端粒对端粒 (T2T) 人类参考基因组 (T2T-CHM13) 已经解析了复杂的基因组区域.
  • 之前未解决的序列,包括多中心的染色体短臂和基因家族,缺乏详细的表观遗传特征.

研究的目的:

  • 在T2T-CHM13基因组中进行高分辨率的表观遗传学研究.
  • 在这些复杂区域绘制CpG甲基化,DNA可访问性和染色体免疫沉测序 (ChIP-seq) 峰值.
  • 在以前未被描述的基因组区域研究表观遗传调节和基因活性.

主要方法:

  • 在32.28万个CPG中绘制高分辨率的CPG甲基化图.
  • 对DNA可访问性的分析.
  • 整合了166,058个以前未解决的染色体免疫沉测序峰值.
  • 从六个不同个体的人类中体的表观遗传分析.

主要成果:

  • 精确地绘制了整个杂交染色体短臂的表观遗传特征,基因家族扩展和多种重复类.
  • 在以前未被识别或纠正的基因中发现活性.
  • 发现了临床相关的对应物特异性调节.
  • 在人类中位素中定位的变异性估计.

结论:

  • 这种表观遗传资源为研究难以捉摸的人类基因组区域提供了框架.
  • 这些发现为复杂且以前未解决的基因组序列的表观遗传调节提供了洞察力.
  • 这项研究强调了完整基因组组合对于全面的表观遗传分析的重要性.