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相关概念视频

RNA Editing02:23

RNA Editing

9.1K
RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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Transfer RNA Synthesis02:36

Transfer RNA Synthesis

12.0K
One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
12.0K
Base-pairing and DNA Repair02:27

Base-pairing and DNA Repair

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64.8K
RNA Splicing01:32

RNA Splicing

56.5K
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
56.5K
Nucleic Acids and Nucleotides01:20

Nucleic Acids and Nucleotides

9.1K
Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and have instructions for its functioning. The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).
Deoxyribonucleic Acid (DNA)
DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and the organelles such as chloroplasts and mitochondria....
9.1K
Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

10.7K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
10.7K

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相关实验视频

Updated: Jul 23, 2025

A Nonsequencing Approach for the Rapid Detection of RNA Editing
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使用SNAP-CDAR-S进行精确高效的C-to-URNA基编辑.

Ngadhnjim Latifi1, Aline Maria Mack1, Irem Tellioglu2,3

  • 1Interfaculty Institute of Biochemistry, University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany.

Nucleic acids research
|July 18, 2023
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概括

研究人员开发了SNAP-CDAR-S,这是一个新的RNA基编辑器,用于精确的cytidine-to-uridine编辑. 该工具显著提高了编辑效率,并扩大了RNA基编辑的范围,用于潜在的治疗应用.

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科学领域:

  • 分子生物学分子生物学
  • 基因工程是一种基因工程.
  • 在RNA治疗方面,RNA疗法.

背景情况:

  • 局部指导的RNA基编辑为细胞过程操纵和新疗法提供了暂时和可控制的基因修饰.
  • 虽然腺-氨酸 (A-to-I) 编辑工具已经发展良好,但精确的氨酸-尿素 (C-to-U) 编辑工具仍然不那么先进.

研究的目的:

  • 设计一种高效且可编程的RNA基编辑器,用于丁-丁编辑.
  • 在具有挑战性的序列环境中提高编辑效率,例如5'-CCN.
  • 将新工具的性能与现有的RNA编辑技术进行比较.

主要方法:

  • 来自ADAR2的cytidine deaminase域的演变,根据RESCUE-S工具进行了调整.
  • 将RNA向机制从基于Cas13的转换为基于SNAP标签的.
  • 优化指导RNA化学,以提高编辑产量.
  • 下一代测序 (NGS) 用于评估编辑效率和非目标效应.

主要成果:

  • 新的SNAP-CDAR-S工具展示了高效和可编程的C-to-URNA基编辑.
  • 编辑产量显著提高,特别是在5'-CCN序列背景下.
  • 在编辑β-catenin通路的效率和干扰方面,SNAP-CDAR-S的性能优于RESCUE-S工具.
  • 对NGS的分析显示,这两种工具的全球非目标A-to-I和C-to-U编辑是相似的,适度的.

结论:

  • SNAP-CDAR-S代表了RNA基编辑技术的重大进步,为C-to-U编辑提供了更高的效率和可编程性.
  • 该工具的性能提升扩大了RNA基编辑的基底范围和治疗潜力.
  • 进一步研究优化导向RNA化学和理解非目标效应是有必要的.