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SARS-CoV-2による強化された先天性免疫回避の進化
Lucy G Thorne1, Mehdi Bouhaddou2,3,4,5, Ann-Kathrin Reuschl1
1Division of Infection and Immunity, University College London, London, UK.
Nature
|December 23, 2021
まとめ
SARS-CoV-2 アルファ変種は,核カプシドタンパク質 (N),Orf9b,Orf6のレベルが上昇したため,免疫反応をより効果的に抑制します. これらの抗ウイルス薬は感染の伝播を促進し,感染期間を長引かせる可能性があります.
科学分野:
- ウイルス学
- 免疫学
- 分子生物学
背景:
- 懸念されるSARS-CoV-2の変種は,ヒトからヒトへの感染が強化されるための適応を示しています.
- 焦点はスパイクタンパク質の変異であったが,非スパイク変異はウイルスの適応に寄与する可能性がある.
研究 の 目的:
- スパイクタンパク質の外にあるSARS-CoV-2アルファ変異が先天的な免疫抑制に与える影響を調査する.
- アルファ変異体がウイルスの伝播と複製を促進するメカニズムを解明する.
主な方法:
- 偏りのない豊富なプロテオミクス,フォスフォプロテオミクス,RNAシーケンシング.
- 呼吸道上皮細胞でのウイルスの複製検査
- ミトコンドリアタンパク質TOM70とのOrf9bの相互作用と,先天的な免疫活性化におけるその役割を調査した.
主要な成果:
- アルファ変異の単離は,第1波の単離と比較して,先天的な免疫反応の抑制を強めた.
- アルファ変種では,核カプシドタンパク質 (N),Orf9b,Orf6の濃度が顕著に上昇した.
- Orf9bは,MAVS活性化の重要なレギュラーであるTOM70との相互作用によって,先天的な免疫を抑制する.
- Orf9b- TOM70の相互作用は,リン酸化によって調節される.
結論:
- Orf9bのようなウイルスの免疫アンタゴニストの増強表現は,アルファ変異の伝染性の増加に寄与する.
- 特にNとOrf9bの調節領域にあるスパイクタンパク質の外の変異は,SARS-CoV-2の適応に極めて重要です.
- デルタとオミクロン変種における同様の変異は,ウイルスの進化における非急増適応の重要性を強調しています.
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