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相关概念视频

Restarting Stalled Replication Forks02:37

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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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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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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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The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Detection of Post-Replicative Gaps Accumulation and Repair in Human Cells Using the DNA Fiber Assay
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S相检查点可以防止异常的复制分叉处理和降解.

Iván Núñez-Martín1,2, Lucy S Drury3, María I Martínez-Jiménez4

  • 1Andalusian Center of Molecular Biology and Regenerative Medicine, Universidad de Sevilla-CSIC-Universidad Pablo de Olavide, Seville 41092, Spain.

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概括
此摘要是机器生成的。

癌细胞中的复制压力由检查点来管理. 我们的研究表明,DNA处理因子会通过在停滞的分叉处降解新生的DNA导致细胞死亡,这是人类PrimPol.Pol可以预防的过程.

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科学领域:

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

背景情况:

  • 复制压力是癌细胞的常见特征,需要强大的检查点机制来保持基因组稳定性.
  • 在DNA损伤期间复制叉的完整性对于细胞生存至关重要,但导致检查点突变细胞死亡的精确机制仍然难以捉摸.

研究的目的:

  • 阐明复制分叉不稳定性和细胞死亡背后的分子机制,在芽的酵母检查点突变体中暴露于DNA损伤.
  • 为了确定涉及到停滞复制叉的异常处理的特定DNA处理因素.

主要方法:

  • 利用芽生长酵母 (Saccharomyces cerevisiae) 作为一个模型生物体.
  • 使用检查点突变物和DNA处理因子 (Rad51,Rad5,Mus81,Exo1) 的遗传分析.
  • 通过分子测试评估复制叉完整性和新生的DNA降解,包括人类PrimPol表达的影响.

主要成果:

  • 确定了Rad51,Rad5 (HIRAN和酶域) 和Mus81的催化活性,作为对检查点突变细胞死亡的贡献者.
  • 证明了EXO1,以及上述因素,在DNA损伤后,在停滞的复制分叉中驱动新生的DNA的降解.
  • 表明在酵母中表达人类PrimPol可以减轻这种新生的DNA降解.

结论:

  • 在DNA损伤过程中,S相检查点对于防止DNA损伤期间停滞复制叉的有害处理至关重要.
  • 由于没有功能检查点,DNA处理因子的异常处理导致新生的DNA降解和细胞死亡.
  • 在停滞的复制分叉中保护新生的DNA完整性是S相检查点的关键功能.