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相关概念视频

Conservative Site-specific Recombination and Phase Variation02:53

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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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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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LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
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相关实验视频

Updated: Jun 26, 2025

Non-Viral Engineering of Primary Human T Cells via Homology-Mediated End-Joining Targeted Integration of Large DNA Templates
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大T抗原介导的基因复制提高了特定位点的重组效率.

Zening Wang1,2, Chuan Chen2, Xin Ge1,2

  • 1Institute of Molecular Medicine, University of Texas Health Science Center at Houston, Houston, TX, United States.

Frontiers in bioengineering and biotechnology
|May 13, 2024
PubMed
概括

SV40大T抗原 (TAg) 表达通过放大供体DNA来提高位点特异性重组 (SSR) 效率. 这种TAG促进的RMCE (T-RMCE) 能够进行大规模的基因组查和哺乳动物细胞的定向进化.

关键词:
这是RMCE的RMCE.指导进化是指导进化的.基因组编辑 基因组编辑大型T抗原.特定位置的复合酶.

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科学领域:

  • 分子生物学分子生物学
  • 遗传学 是一个遗传学.
  • 生物技术是生物技术.

背景情况:

  • 位点特异性重组 (SSR) 能够实现精确的基因组修饰,但由于供体DNA的可用性较低而受到限制.
  • 已知SV40大T抗原 (TAg) 可以增强来自SV40起源的DNA复制.

研究的目的:

  • 调查SV40 TAg表达是否可以增加捐赠体等离子体拷贝数量并提高SSR效率.
  • 开发一种用于改进基因组工程应用的新方法.

主要方法:

  • 在293F细胞中进行了双重复合酶介导的磁带交换 (RMCE).
  • 与SV40 TAg同传染被用于测试其对SSR效率的影响.
  • 捐赠体等离子体放大被评估与重组事件的相关性.

主要成果:

  • 在多克隆细胞中,TAg共传染显著提高了SSR效率.
  • 在单克隆细胞系中,与捐赠体等离子体放大相关的12%的RMCE效率得到了实现.
  • 使用T-RMCE系统构建了具有>10^7多样性的图书馆.

结论:

  • 通过放大供体DNA,SV40 TAg表达有效地增强SSR,克服了一个关键的限制.
  • T-RMCE (T-RMCE) 是一个强大的工具,用于生成用于定向进化的高多样性库.
  • 通过TAg进行目标基因放大原理对更广泛的基因组查和基因编辑应用具有前景.