SARS-CoV-2のスパイクD614Gの変異は複製と伝播を強化する
Bin Zhou1, Tran Thi Nhu Thao2,3,4, Donata Hoffmann5
1CDC COVID-19 Response, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Nature
|February 26, 2021
まとめ
SARS-CoV-2のスパイクタンパク質のD614G変異は,ウイルスの結合と複製を強化する. この変種は動物モデルでの伝染性の増加を示し,その世界的な優位性を説明しています.
科学分野:
- ウイルス学
- 分子生物学
- 流行病学について
背景:
- SARS-CoV-2のスパイク・グリコタンパク質 (S) のD614G置換は,世界的に優勢になっています.
- この変異の流行の理由は,フィットネス上の優位性であろうと,創始者の効果であろうと,明確ではありませんでした.
研究 の 目的:
- SARS-CoV-2の複製と伝播に対するD614G置換の機能的影響を調査する.
- D614G型に 身体能力の優位性があるかどうか
主な方法:
- D614Gの置換のみで異なる同種型SARS-CoV-2を使用した.
- ヒトの血管新生変換酵素2 (ACE2) 受容体へのウイルスの結合を評価した.
- ヒトの呼吸道上皮培養とACE2ノックインマウスの複製を測定した.
- ハムスターとフレットモデルでの複製と伝播の評価
主要な成果:
- D614Gの変種は,ヒトのACE2への結合が強化されたことを示した.
- ヒトの呼吸道細胞と in vivo モデルでは,ウイルスの複製が増加することが観察されました.
- ハムスターとフレットモデルでは,著しく高い複製性と伝染性が認められた.
- D614Gの代替は,特にトランスミッションのボトルネック時に,競争上の利点をもたらしました.
結論:
- SARS-CoV-2のスパイクタンパク質におけるD614Gの置換は,体内での有意なフィットネス・アドバンテージを提供します.
- 強化された結合と複製は,変種の伝染性の増加に寄与する.
- この研究は,SARS-CoV-2のD614Gの世界的な優位性を説明しています.
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