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DNA Damage Can Stall the Cell Cycle02:36

DNA Damage Can Stall the Cell Cycle

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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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DNA Damage can Stall the Cell Cycle02:36

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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Spontaneous and Induced Mutations01:30

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Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
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Updated: Jan 15, 2026

Gene-therapy Inspired Polycation Coating for Protection of DNA Origami Nanostructures
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Gene-therapy Inspired Polycation Coating for Protection of DNA Origami Nanostructures

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纳米塑料可以改变DNA.

Maxim Varenicja1, Oldamur Hollóczki1

  • 1Department of Physical Chemistry, University of Debrecen, Egyetem tér 1, 4032 Debrecen, Hungary.

Nano letters
|October 9, 2025
PubMed
概括
此摘要是机器生成的。

带正电荷的塑料可以通过与酸盐组结合来改变DNA结构. 这种相互作用将DNA从B-DNA转移到更罕见的A-DNA形式,这可能会产生毒理学影响.

关键词:
结合 DNA 的 DNA 结合.DNA 形状的 DNA 形状.分子动力学分子动力学变异性影响 变异性影响纳米塑料是一种纳米塑料.

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科学领域:

  • 生物化学 生物化学
  • 材料科学 材料科学 材料科学
  • 毒理学 毒理学 毒理学

背景情况:

  • 塑料,特别是功能化聚钢,是无处不在的环境污染物.
  • 了解塑料与DNA等生物分子之间的相互作用对于评估它们对环境的影响和毒性至关重要.

研究的目的:

  • 为了研究功能化的聚烯链与DNA螺旋的直接结合.
  • 为了确定与聚乙烯相互作用时在DNA中诱导的结构变化.
  • 阐明功能组和静电相互作用在这种结合过程中的作用.

主要方法:

  • 使用了100 ns持续时间的分子动力学模拟.
  • 在功能化的聚烯链的存在下分析DNA的几何特征.

主要成果:

  • 观察到功能化的聚乙烯链与DNA直接结合.
  • 聚烯上具有正电荷的功能组对于通过与酸盐部分的库伦比相互作用与DNA稳定关联至关重要.
  • 在模拟过程中,DNA结构从B-DNA形式转移到A-DNA形式.

结论:

  • 功能化的聚乙烯可以诱导DNA的显著构造变化.
  • 在塑料存在的情况下,转向A-DNA形式的转变表明了微塑料有毒作用的潜在机制.