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相关概念视频

Chromosome Structure02:40

Chromosome Structure

26.6K
A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
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Chromosome Structure02:40

Chromosome Structure

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Chromosome Replication02:31

Chromosome Replication

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Before a cell can divide, it must accurately replicate all of its chromosomes, including the DNA and its associated histone and non-histone proteins.  This process begins at numerous origins of replication during the S phase of the cell cycle in each of a cell’s chromosomes simultaneously. Certain nucleotides can act as origins of replication, but these sequences are not well defined - especially in complex, multi-cellular, eukaryotic species. The length of DNA that spans an origin...
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Lampbrush Chromosomes01:51

Lampbrush Chromosomes

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In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
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Lampbrush Chromosomes

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Polytene Chromosomes02:04

Polytene Chromosomes

11.0K
Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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相关实验视频

Updated: Feb 7, 2026

Surface Spreading and Immunostaining of Yeast Chromosomes
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创建一个功能单染色体酵母

Yangyang Shao1,2, Ning Lu1,2, Zhenfang Wu3

  • 1Key Laboratory of Synthetic Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China.

Nature
|August 3, 2018
PubMed
概括
此摘要是机器生成的。

科学家通过合并16个染色体来制造出单染色体酵母. 这种巨大的染色体支持生命, 但影响酵母的生长和活力, 提供对染色体进化的见解.

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相关实验视频

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科学领域:

  • 合成生物学
  • 基因组学
  • 细胞生物学

背景情况:

  • 细胞基因组通常被组织成多个染色体.
  • 染色体结构对于基因组的稳定性和功能至关重要.
  • 了解染色体的组织可以了解进化论.

研究的目的:

  • 从多染色体Saccharomyces cerevisiae中设计一个功能性的单染色体酵母.
  • 研究染色体数量减少对基因组结构和功能的影响.
  • 探索有关染色体结构和功能的真核生物进化.

主要方法:

  • 在Saccharomyces cerevisiae中使用了连续的端到端染色体融合.
  • 进行向的中间体删除以实现染色体数量的减少.
  • 使用各种技术分析全球三维基因组结构的变化.
  • 单染色体和野生类型酵母的转录和现象概况的比较.

主要成果:

  • 从16个原生染色体中成功制造出一种可行的单染色体酵母菌株.
  • 由于染色体融合,观察到三维基因组结构的显著变化.
  • 在单染色体和野生类型酵母之间发现了几乎相同的转录组特征.
  • 发现了类似的现象,但工程菌株的生长,竞争力和生存能力有所降低.

结论:

  • 一个功能性的单个染色体可以支持真核细胞的生命.
  • 减少染色体数量大大改变了基因组结构,但并没有改变全球基因表达.
  • 这种合成生物学方法为研究染色体进化和功能提供了一种新的方法.