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Position-effect Variegation02:32

Position-effect Variegation

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.
Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the timing and level of...
Determining the Plane of Cell Division02:13

Determining the Plane of Cell Division

Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function. 
Animal cells
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Subcellular Fractionation01:32

Subcellular Fractionation

The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation.
Differential Centrifugation
Differential centrifugation is...
Cell Diversity01:13

Cell Diversity

The concept of a cell started with microscopic observations of dead cork tissue by Robert Hooke in 1665. Hooke coined the term "cell" based on the resemblance of the small subdivisions in the cork to the rooms that monks inhabited, called cells. About ten years later, Antonie van Leeuwenhoek became the first person to observe the living and moving cells under a microscope. In the century that followed, the theory that cells represented the basic unit of life developed.
Multicellular organisms...

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Updated: Jun 24, 2026

Biophysical Assays to Probe the Mechanical Properties of the Interphase Cell Nucleus: Substrate Strain Application and Microneedle Manipulation
16:27

Biophysical Assays to Probe the Mechanical Properties of the Interphase Cell Nucleus: Substrate Strain Application and Microneedle Manipulation

Published on: September 14, 2011

人間の細胞におけるテロメア位置効果

J A Baur1, Y Zou, J W Shay

  • 1Department of Cell Biology, University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, TX 75390-9039, USA.

Science (New York, N.Y.)
|June 16, 2001
PubMed
まとめ
この要約は機械生成です。

テロメア位置効果 (TPE) は,ヒト細胞のテロメア付近の遺伝子を静止させます. この静止は逆転し,テロメアの長さに依存し,細胞の寿命にわたって遺伝子発現に影響を与えます.

さらに関連する動画

Computational Analysis of the Caenorhabditis elegans Germline to Study the Distribution of Nuclei, Proteins, and the Cytoskeleton
08:01

Computational Analysis of the Caenorhabditis elegans Germline to Study the Distribution of Nuclei, Proteins, and the Cytoskeleton

Published on: April 19, 2018

Injection of Porcine Adipose Tissue-Derived Stroma Cells via Waterjet Technology
07:05

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関連する実験動画

Last Updated: Jun 24, 2026

Biophysical Assays to Probe the Mechanical Properties of the Interphase Cell Nucleus: Substrate Strain Application and Microneedle Manipulation
16:27

Biophysical Assays to Probe the Mechanical Properties of the Interphase Cell Nucleus: Substrate Strain Application and Microneedle Manipulation

Published on: September 14, 2011

Computational Analysis of the Caenorhabditis elegans Germline to Study the Distribution of Nuclei, Proteins, and the Cytoskeleton
08:01

Computational Analysis of the Caenorhabditis elegans Germline to Study the Distribution of Nuclei, Proteins, and the Cytoskeleton

Published on: April 19, 2018

Injection of Porcine Adipose Tissue-Derived Stroma Cells via Waterjet Technology
07:05

Injection of Porcine Adipose Tissue-Derived Stroma Cells via Waterjet Technology

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科学分野:

  • 分子生物学は分子生物学である.
  • 遺伝学 遺伝学とは
  • エピジェネティクス エピジェネティクス

背景:

  • テロメア位置効果 (TPE) は,酵母菌で観察される現象で,テロメア付近の遺伝子が逆行的に静止される.
  • 人間の細胞のTPEを理解することは,遺伝子調節と細胞の老化を理解するために不可欠です.

研究 の 目的:

  • TPEの存在と特性をヒト細胞で実証する.
  • TPEを調節するメカニズムを調査し,ヒストン脱セチラーゼ阻害剤とテロメアの長さの役割を含む.

主な方法:

  • 新しく形成されたテロメアに隣接するルシフェラーゼレポーター遺伝子を持つHeLa細胞クローンを利用しました.
  • テロメアクローンにおけるレポーター遺伝子発現と,ランダム統合による対照クローンの比較.
  • トリコスタチンA (ヒストン脱酸化酵素阻害剤) と過剰発現したヒトテロメラーゼ逆転写酵素 (hTERT) を投与した.

主要な成果:

  • レポーター遺伝子に隣接するテロメアを持つヒト細胞クローンは,対照と比較して,ルシフェラーゼ発現が10倍減少したことを示した.
  • トリコスタチンA治療は,テロメアクローンにおけるルシフェラーゼ発現を回復させた.
  • hTERTの過剰発現はテロメアの延長につながり,テロメアのクローンの発現がさらに2〜10倍減少しました.

結論:

  • テロメア位置効果 (TPE) は,ヒト細胞に存在し,機能しています.
  • TPE媒介による遺伝子静止は逆行性であり,ヒストンアセチル化によって影響を受けます.
  • テロメア長さはTPEの重要な決定因子であり,ヒト細胞の複製寿命を通じて遺伝子発現を調節するメカニズムを提供します.