CRISPR-Casによる保護にもかかわらず,ファグ誘発成長遅延とSOS応答誘導
Benoit J Pons1, Urszula Łapińska2, Iolanda Lopes-Domingues1
1University of Exeter Environment and Sustainability Institute, Penryn TR10 9FE, UK.
まとめ
バクテリアのCRISPR免疫は 溶解だけでなく 成長障害を引き起こします この研究は,細菌集団に影響を与えるファグ誘発の分裂遅延とフィラメンテーションを明らかにしています.
科学分野:
- 細菌学
- 微生物生態学
- 遺伝学
背景:
- 細菌は表面変異またはCRISPR-Cas免疫によってファグ耐性を進化させる.
- CRISPR免疫には未知の誘導性コストがあり,おそらくファグDNA注射の防止が不完全であるためである.
- 以前の仮説では 死亡率や成長率の低下が 原因だと考えられていました
研究 の 目的:
- クリスパー・カスの免疫コストの背後にあるメカニズムを研究する.
- CRISPRの免疫コストの源として死亡率と成長障害を区別する.
- CRISPRの免疫コストの 生態学的影響を理解するために
主な方法:
- マイクロフリウジックベースの単細胞アプローチを使用しました.
- 宿主生存と成長のフォストファージ曝露をモニターするためにフローサイトメトリを使用します.
- DMS3ウイルスのファージに* Pseudomonas aeruginosa* 暴露した.
主要な成果:
- CRISPRの免疫は,ファグ誘発の溶解から効果的に保護します.
- CRISPR免疫は,ファグ誘発の分裂遅延,フィラメント化,およびサブ集団におけるSOS応答を防ぐことはできません.
- フェーグ誘発の成長欠陥の異質性が見られた.
結論:
- 集団レベルでのCRISPR免疫のコストは,異質なファグ誘発の成長欠陥から生じる.
- CRISPR免疫のコストは 細菌の成長障害と関連しており 死亡率だけではありません
- これらのコストを理解することは 細菌の免疫システムの進化に不可欠です
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