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Substrate Generation for Endonucleases of CRISPR/Cas Systems
Published on: September 8, 2012
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トランポゾンでコードされたCRISPR-Casシステムは,RNA誘導DNA統合を直接行います
Sanne E Klompe1, Phuc L H Vo2, Tyler S Halpin-Healy1
1Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY, USA.
Nature
|June 13, 2019
まとめ
バクテリアのトランポゾンは,DNA統合のためのCRISPR-Casシステムを再利用し,二重鎖の断絶なしにプログラム可能な遺伝子挿入を可能にしました. この発見は 精密なゲノム操作のための 新しいツールを提供します
科学分野:
- 分子生物学
- 遺伝学
- 微生物学
背景:
- 従来のCRISPR-Casシステムは ゲノムの完全性を保ちながら 移動性遺伝子要素を分解するために ガイドRNAを使用します
- バクテリアのTn7のようなトランポゾンは 宿主ゲノムに統合される 移動性遺伝的要素です
研究 の 目的:
- 細菌のトランポゾンによるヌクレアース欠乏のCRISPR-CasシステムによるRNA誘導DNA統合を調査する.
- この新しいプログラム可能なトランスポーゼーションシステムのメカニズムと特異性を説明する.
主な方法:
- Vibrio cholerae Tn6677トランポゾンがEscherichia coliで利用されました.
- CRISPR関連 (カスケード) およびトランポゾン関連 (TniQ) タンパク質のトランポジションにおける役割を調査した.
- ゲノム全体の挿入部位と特異性を分析するためにディープシーケンシングを使用した.
主要な成果:
- CRISPR- カス- トランポソン共複合体による移動性遺伝子要素のRNA誘導統合が実証された.
- ターゲットシーケンスから固定された距離で プログラム可能な局所特有のDNA挿入を展示しました
- 多数のゲノム部位で高い特異性を持つ変数長さの遺伝的ペイロードの収納が確認されています.
結論:
- バクテリアのトランポゾンがCRISPR-Cas機構を用いてRNAによる統合を行う新しいパラダイムを発見した.
- 精密なゲノム操作のための完全プログラム可能なRNA誘導インテグラーゼシステムを確立しました.
- このシステムは二重鎖の断裂や ホモロジーによる修復の必要性を回避し 遺伝子工学の新たな道を開きます
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