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相关概念视频

The DNA Replication Fork01:02

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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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相关实验视频

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Visualization of DNA Replication in the Vertebrate Model System DT40 using the DNA Fiber Technique
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在脊椎动物中,TOP1和TOP2互补地维持了DNA复制叉的进展.

Koyuki Umemura1, Masato Ooka2, Miku Sojo1

  • 1Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Minamiosawa 1-1, Hachioji-shi, Tokyo, Japan.

The Journal of biological chemistry
|March 6, 2026
PubMed
概括
此摘要是机器生成的。

拓酶TOP1和TOP2对于DNA复制至关重要. 这项研究揭示了它们在脊椎动物细胞中的互补作用,影响了复制的进展和启动.

关键词:
DT40 DT40 DT40 DT40 DT40 DT40 DT40 DT40 DT40 DT40 DT40在TOP1中排名第一.在TOP2中排名第一.拓糖酶是一种多糖酶.

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科学领域:

  • 分子生物学分子生物学
  • 遗传学 遗传学 是一个
  • 细胞生物学 细胞生物学

背景情况:

  • 拓酶TOP1和TOP2在复制过程中管理DNA的拓压力.
  • 它们在酵母中的互补功能是已知的,但它们在脊椎动物细胞中的相互作用是不清楚的.

研究的目的:

  • 为了研究脊椎动物DNA复制中TOP1和TOP2之间的功能相互作用.
  • 为了确定TOP1和TOP2是否在脊椎动物细胞中表现出互补的作用.

主要方法:

  • 使用条件下TOP1贫乏的DT40细胞,基因编辑的一个模型.
  • 采用了TOP2抑制剂ICRF193和TOP2毒素埃托.
  • 评估了复制分叉的进展,S阶段的停止和亡.

主要成果:

  • 单独的TOP1枯竭或单独的TOP2抑制并没有阻碍DNA复制.
  • 结合TOP1枯竭和TOP2抑制几乎取消了DNA复制,导致S阶段停止和亡.
  • TOP1 枯竭结合以托胺治疗导致G1/早期S阶段停止,表明复制启动受损.

结论:

  • TOP1和TOP2在脊椎动物DNA复制中具有互补的作用.
  • 这些拓酶对于脊椎动物细胞的复制进展和启动都至关重要.