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相关概念视频

Forces Acting on Chromosomes02:11

Forces Acting on Chromosomes

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During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis. 
Microtubules and motor proteins exert two types of forces on...
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Histone Variants at the Centromere02:30

Histone Variants at the Centromere

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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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Attachment of Sister Chromatids02:57

Attachment of Sister Chromatids

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As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules.  Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall...
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Centrioles and Centrosomes01:13

Centrioles and Centrosomes

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Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
Near the end of the prophase, also called late prophase or...
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Anaphase A and B01:39

Anaphase A and B

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Microtubules form through the end-to-end polymerization of tubulin heterodimers. Kinetochore microtubules originate from the spindle poles, and their plus-ends connect with the kinetochores on sister-chromatids. Ndc80 protein complexes, present on the kinetochore, form low-affinity links with the plus end of these kinetochore microtubules.
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
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Spindle Assembly02:50

Spindle Assembly

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Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a...
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相关实验视频

Updated: Sep 12, 2025

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
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Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins

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中心分子驱动并休息一下.

Paul B Talbert1, Steven Henikoff2

  • 1Howard Hughes Medical Institute, Fred Hutch Cancer Center, 1100 Fairview Avenue N, Seattle, WA, 98109, USA.

Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology
|August 4, 2025
PubMed
概括

中粒体通过"中粒体驱动"机制快速进化,其中DNA修复过程,而不仅仅是细胞分裂中的错误,扩展和收缩卫星DNA. 这会影响进化和癌症等疾病.

关键词:
断裂诱导的复制是由于突破导致的.癌症 癌症 癌症 癌症中心线驱动器驱动器在Kinetochore中进行演出.卫星DNA是卫星中的DNA.规格 规格 规格 规格

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Live Cell Imaging to Assess the Dynamics of Metaphase Timing and Cell Fate Following Mitotic Spindle Perturbations
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Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
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科学领域:

  • 遗传学 是一个遗传学.
  • 分子生物学分子生物学
  • 进化生物学 进化生物学

背景情况:

  • 中粒体对于染色体分离至关重要,表现出多样性和复杂性,主要由大多数真核生物中的卫星DNA数组组成.
  • 关键的中间体蛋白质 (CENPA,CENPB,CENPC) 和快速的中间体进化表明一个"中间体驱动"模型影响了动态核心蛋白质.

研究的目的:

  • 审查最近关于驱动中心体进化的机制的发现.
  • 探索非B形DNA结构和DNA修复在卫星DNA动态中的作用.
  • 为了连接复制过程中中心体不稳定性与癌症中的形状.

主要方法:

  • 审查最近的科学文献和研究成果.
  • 在中心卫星区域对DNA复制叉动态的分析.
  • 检查DNA修复途径,特别是破坏诱导的复制 (BIR).

主要成果:

  • 卫星中间体中的非B形DNA结构会导致频繁的复制分叉停滞.
  • 断裂诱导复制 (BIR) 被认为是卫星DNA膨胀和收缩的主要机制,而不是不平等的姐妹染色体交换.
  • 与复制相关的中粒体断裂,而不是线粒体错误,与大多数中粒体错误划分有关,导致癌症中的形状.

结论:

  • 中心分子进化受到DNA修复机制的显著影响,这些机制作用于卫星DNA中的停滞的复制分叉.
  • 中心分子驱动模型由破坏诱导的复制作为发动机来产生卫星DNA拷贝数的变化.
  • 了解与复制相关的中粒体不稳定性,可以了解与癌症相关的血管积分病.