CRISPR/Cas9によって触媒化されたDNA分裂産物の双方向性分解
Journal of the American Chemical Society
|February 21, 2018
まとめ
CRISPR-Cas9の遺伝子編集は DNAの断片を作り出し 以前考えていたように 突っ端は薄くありません カス9
科学分野:
- 分子生物学
- 遺伝子編集技術
- 生物化学
背景:
- ストレプトコッカス・ピオゲネス CRISPR-Cas9は広く使用されている遺伝子編集ツールです.
- Cas9は,協調的な割れ方によって,ぼんやりしたDNA製品を生成すると信じられていた.
- RuvC核酵素ドメインは,非標的DNA鎖 (ntDNA) を分解することが知られている.
研究 の 目的:
- 精密なDNA分裂とCas9の処理メカニズムを調査する
- RuvCドメインのPCTの特徴を説明する.
- Cas9による分裂後のDNAの結末の形成を明らかにする.
主な方法:
- Cas9の分裂とRuvCのPCT活性を定量化するための生化学分析
- DNA製品の長さと末端構造の分析
- DNAの分解と産物の放出に関する運動学的研究
主要な成果:
- Cas9は5'-オーバーハングの分断されたDNA製品を生成する.
- RuvCは3'→5'と以前未確認の5'→3'のPCT活動の両方を表しています.
- RuvCによるntDNAの分解は,不均一なDNAの末端を生じさせ,その中には,不均一な末端と分断された末端が含まれます.
結論:
- Cas9媒介のDNA分裂は異質なDNA末端を生じさせ,以前のモデルに異議を唱える.
- RuvCで触媒化されたPCTは,DNA末端形成に有意な影響を及ぼします.
- これらのメカニズムを理解することは,CRISPR-Cas9遺伝子編集の最適化と in vivo 改変パターンの説明に不可欠です.
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