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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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Chromosome Structure02:40

Chromosome Structure

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A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
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S-Cdk Initiates DNA Replication02:38

S-Cdk Initiates DNA Replication

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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).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of...
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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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The Replisome03:01

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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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Translesion DNA Polymerases02:10

Translesion DNA Polymerases

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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.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
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自催化 DNA 电路系列

Qiong Wu1, Wei Xu2, Jinhua Shang3

  • 1School of Medicine, Wuhan University of Science and Technology, Wuhan 430081, China.

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概括

自催化DNA电路使自我复制和催化成为可能,这对于生命的起源和现代生物工程至关重要. 这些电路推进了超敏感生物传感和DNA纳米结构,用于生物分析和生物医学中的应用.

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科学领域:

  • 生物化学 生物化学
  • 分子生物学分子生物学
  • 合成生物学 合成生物学

背景情况:

  • 自催化,即产物催化自身形成的过程,对于基因组复制和代谢网络等生物系统至关重要.
  • DNA分子提供可编程和可控制的平台,用于设计复杂的自催化电路.
  • 之前的研究已经证实了DNA在创造自我维持的反应系统方面的潜力.

研究的目的:

  • 为工程自催化DNA电路的最新进展提供全面的审查.
  • 探索这些电路的基本原理,构造方法和实际应用.
  • 讨论在自催化DNA电路领域的当前挑战和未来方向.

主要方法:

  • 探索DNAzyme生物催化,酶催化和动态杂交组合作为核心构建原则.
  • 对各种应用的自催化DNA电路工程技术的调查.
  • 分析由这些电路生成的安普利康,用于DNA纳米结构.

主要成果:

  • 自催化DNA电路能够超敏感检测包括DNA,RNA,病毒和蛋白质在内的生物分子.
  • 电路安普利康作为先进DNA纳米结构的构建块,使细胞内生物成像和算法组装等功能成为可能.
  • 在生物分析,生物医学和仿生学中展示各种应用.

结论:

  • 工程自催化DNA电路是敏感分子检测和构建功能性DNA纳米结构的强大工具.
  • 这些电路在生物分析,诊断和生物模拟系统的开发方面具有重大潜力.
  • 持续的研究对于克服当前挑战和充分实现自催化DNA电路的未来潜力至关重要.