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関連する概念動画

RNA Editing02:23

RNA Editing

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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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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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CRISPR/Cas9 Genome Editing01:28

CRISPR/Cas9 Genome Editing

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The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
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Mismatch Repair01:36

Mismatch Repair

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Mismatch Repair01:20

Mismatch Repair

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
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Nucleotide Excision Repair01:08

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関連する実験動画

Updated: Jan 13, 2026

A Nonsequencing Approach for the Rapid Detection of RNA Editing
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A Nonsequencing Approach for the Rapid Detection of RNA Editing

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Argonauteを介したRNA編集による点突然変異の選択的修復

Zhiwei Zhang1, Jinyue Wang1, Tongyu Guo1

  • 1State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, Hubei 430062, China.

Nucleic acids research
|January 7, 2026
PubMed
まとめ

本研究では、哺乳類細胞におけるRNAノックダウンおよび編集のためのプログラム可能なヌクレアーゼMcAgoを紹介します。DNAを変更せずに正確な遺伝子発現制御を提供し、Argonauteタンパク質の機能を拡張します。

キーワード:
ArgonauteRNA編集遺伝子ノックダウンMcAgoRNAターゲティング

さらに関連する動画

A Standard Methodology to Examine On-site Mutagenicity As a Function of Point Mutation Repair Catalyzed by CRISPR/Cas9 and SsODN in Human Cells
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A Standard Methodology to Examine On-site Mutagenicity As a Function of Point Mutation Repair Catalyzed by CRISPR/Cas9 and SsODN in Human Cells
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科学分野:

  • 分子生物学
  • 遺伝子調節
  • バイオテクノロジー

背景:

  • RNA編集は、ゲノムの永続的な変化なしに動的な遺伝子調節を提供します。
  • Argonauteタンパク質はRNA干渉経路の鍵となります。

研究 の 目的:

  • Monosporascus cannonballus由来のMcAgoをRNAターゲティングのために特徴づけること。
  • 哺乳類細胞におけるRNAノックダウンおよび編集のためのMcAgoの可能性を評価すること。

主な方法:

  • 小RNAによってガイドされるMcAgoヌクレアーゼ活性の特性評価。
  • 哺乳類細胞へのMcAgoリボヌクレオプロテイン（RNP）複合体の送達。
  • hADAR2デアミナーゼに結合した触媒的に不活性なMcAgo変異体を使用したin vitro RNA編集アッセイ。

主要な成果:

  • McAgoは生理的温度で強力なRNA切断活性を示しました。
  • McAgo RNP複合体は、哺乳類細胞で免疫応答が低い状態で90%以上の内因性RNAノックダウンを達成しました。
  • dMcAgo-hADAR2dd複合体は、in vitroで最大90%のRNA編集効率を達成しました。

結論:

  • McAgoは哺乳類細胞で内因性RNAを効果的に標的とします。
  • この研究は、RNAノックダウンおよび編集のためのArgonauteタンパク質の有用性を拡張します。
  • この発見は、新しいRNAベースの治療戦略への道を開きます。