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相关概念视频

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
In animal cells, the cleavage furrow forms along the plane of cell division starting...
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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相关实验视频

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

人类细胞中端粒位置的影响.

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
概括
此摘要是机器生成的。

端粒位置效应 (TPE) 沉默了人类细胞中端粒附近的基因. 这种沉默是可逆的,取决于端粒长度,影响细胞寿命的基因表达.

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Computational Analysis of the Caenorhabditis elegans Germline to Study the Distribution of Nuclei, Proteins, and the Cytoskeleton
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相关实验视频

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

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科学领域:

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

背景情况:

  • 端粒位置效应 (TPE) 是一种在酵母中观察到的现象,在这种现象中,端粒附近的基因经历了可逆沉默.
  • 了解人类细胞中的TPE对于理解基因调节和细胞衰老至关重要.

研究的目的:

  • 为了证明TPE在人体细胞中的存在和特征.
  • 调查调节TPE的机制,包括基因素脱乙酶抑制剂和端粒长度的作用.

主要方法:

  • 利用了带有 luciferase 记者基因的 HeLa 细胞克隆,与新形成的端粒相邻.
  • 比较了端粒克隆与随机集成的对照克隆中的记者基因表达.
  • 给药的三静氨酸A (一种基因素脱乙酶抑制剂) 和过度表达的人类端粒酶逆转录酶 (hTERT).

主要成果:

  • 与记者基因相邻的端粒的人类细胞克隆显示,与对照人群相比,露西法酶表达减少了10倍.
  • 特里科斯塔丁A治疗恢复了端粒克隆体中的光酶表达.
  • 过度表达hTERT导致端粒延长,并进一步减少2至10倍的表达端粒克隆.

结论:

  • 端粒位置效应 (TPE) 在人体细胞中存在并具有功能.
  • 通过TPE介导的基因沉默是可逆的,并受到基因素乙化的影响.
  • 端粒长度是TPE的一个关键决定因素,它提供了一种调节人类细胞整个复制寿命的基因表达机制.