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相关概念视频

Homologous Recombination02:31

Homologous Recombination

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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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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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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
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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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Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae
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在Flp-nickase破碎的复制叉上进行双端重组.

Rajula Elango1, Namrata M Nilavar1, Andrew G Li1

  • 1Department of Medicine, Division of Hematology-Oncology and Cancer Research Institute, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA.

Molecular cell
|December 4, 2024
PubMed
概括

复制叉与DNA的碰撞可能会导致不稳定. 我们的研究表明,单个叉与的碰撞触发了双端同源重组 (HR) 修复,可能限制了基因组不稳定性.

关键词:
这就是BRCA1的原因.在Camptothecin的营地里.标签 DNA 号 DNA 号这是一种DNA-蛋白质交叉链接.在 Flp 复合酶的复合过程中,Flp 复合酶一个月/个月破裂诱导的复制.同类的重组组合.复制断裂 复制断裂 复制断裂复制压力是复制的压力.

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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
  • 修复DNA修复DNA的修复

背景情况:

  • DNA 缺陷对基因组稳定性构成风险,特别是在复制过程中.
  • 复制叉与的碰撞可能会导致一端断裂,但相反的叉可能会创建第二端用于修复.
  • 同源重组 (HR) 是修复DNA断裂的关键途径.

研究的目的:

  • 研究哺乳动物细胞中尼克酶诱导HR的机制.
  • 描述复制叉所遇到的修复所涉及的途径.
  • 在尼克酶诱导的HR过程中确定第二个DNA末端的起源.

主要方法:

  • 哺乳动物细胞中的Flp复合酶"步骤停止"尼克酶的发展.
  • 对同类重组途径的分析,包括BRCA2/RAD51依赖和独立基因转换.
  • 使用Tus/Ter复制分叉屏障 (RFB) 来阻止对立的分叉.

主要成果:

  • Flp-尼克酶诱导短通道基因转换 (STGC) 和长通道基因转换 (LTGC).
  • 由Flp-nickase诱导的HR途径在它们对BRCA1,MRE11和CtIP的依赖程度上与复制独立断裂相比有所不同.
  • 用Tus/Ter RFB阻止对方的分叉并没有取消双端STGC,这表明了强有力的反应.

结论:

  • 一个复制叉与Flp-nick的碰撞触发了双端HR.
  • 这种反应可能涉及滞后链的复制性绕道.
  • 这种机制可能会限制基因组不稳定性,这种不稳定性是由被切断的DNA复制引起的.