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相关概念视频

The Replisome03:01

The Replisome

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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
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DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
Many Proteins Work Together to Replicate the Chromosome
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In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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相关实验视频

Updated: Jan 11, 2026

Kinetics of Lagging-strand DNA Synthesis In Vitro by the Bacteriophage T7 Replication Proteins
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Kinetics of Lagging-strand DNA Synthesis In Vitro by the Bacteriophage T7 Replication Proteins

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使用复制循环反应系统的高效变体分相.

Akihiko Mitsutake1,2, Hiroyuki Ishiura1,3, Takashi Matsukawa1

  • 1Department of Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.

Genetics in medicine open
|November 10, 2025
PubMed
概括

复制循环反应 (RCR) 通过跨越大基因组距离的异合体变异相,克服了其他方法的局限性. 这种技术对于通过确定变异位置来诊断遗传疾病至关重要.

关键词:
自体逆向遗传自体逆向遗传化合物异性是指化合物的异性.复制循环的反应反应的复制.变种分阶段化 变种分阶段化

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科学领域:

  • 基因组学就是基因组学.
  • 分子生物学分子生物学
  • 遗传诊断 遗传诊断 遗传诊断 是一个

背景情况:

  • 确定自体逆向基因中异合体变异的cis或trans配置对于遗传诊断至关重要.
  • 现有的分克隆和滴滴数字PCR等方法在变异距离和技术可行性方面存在局限性.

研究的目的:

  • 开发和验证一种新的方法,使用复制循环反应 (RCR) 来分阶段大距离异合体变体.
  • 为了克服当前变种分阶段技术的距离限制.

主要方法:

  • 通过将CRISPR/Cas9切割的基因组片段与oriC-AmpR磁带结合,创建了圆形DNA分子.
  • 复制循环反应 (RCR) 用于放大这些圆形DNA分子.
  • 反应条件得到了优化,并使用电泳和桑格测序验证了分相精度.

主要成果:

  • RCR成功地将基因组区域放大到104kb,从而使异合变异的分期成为可能.
  • 在较低的gDNA-to-cassette比率下实现了用于直接分相的单基因放大.
  • 该方法在所有7名测试患者中证实了化合物异构性,其中变异距离高达152kb.

结论:

  • 复制循环反应 (RCR) 是一种有效的方法,用于分阶段跨越大基因组距离的多个异合体变体.
  • 这种技术为遗传诊断提供了显著的进步,特别是在自体相衰退性疾病中.