mRNAのN1-メチルプセウドウリデリレーションは,1のリボソームフレームシフトを引き起こす
Thomas E Mulroney1, Tuija Pöyry1, Juan Carlos Yam-Puc1
1MRC Toxicology Unit, University of Cambridge, Cambridge, UK.
Nature
|December 6, 2023
まとめ
SARS-CoV-2 のように改変されたmRNAワクチンは,N1-メチルプセウドウリジンによるリボソームのフレームシフトを引き起こす可能性があります. 配列の最適化はこれらの意図しないタンパク質を減らすことができます.
科学分野:
- 分子生物学
- ワクチン学
背景:
- SARS-CoV-2などの治療用タンパク質およびワクチンの製造には,インビトロ転写 (IVT) メッセンジャーRNA (mRNA) が不可欠である.
- 改変されたリボヌクレオチドは,IVT mRNAに組み込まれ,先天的な免疫性を低下させるが,その影響は,翻訳の忠実にまだ十分に調査されていない.
研究 の 目的:
- mRNAの翻訳精度に対するN1-メチルプセウドウリジン組み込みの影響を調査する.
- ワクチン接種した被験者における観察された翻訳誤差,特に+1リボソームフレームシフトのインビボ関連性を評価する.
主な方法:
- N1-メチルプセウドウリジンによるmRNAの体内転写.
- mRNA翻訳中のリボソームフレームシフトの分析 in vitro 試験を用いて.
- BNT162b2 mRNAワクチン接種後のマウスおよびヒトのフレームシフト製品に対する細胞免疫の評価.
主要な成果:
- N1-メチルプセウドウリジンをmRNAに組み込むと,in vitroで+1のリボソームフレームシフトが発生する.
- マウスとヒトにおけるBNT162b2ワクチンのmRNA翻訳による+1フレームシフト製品に対する細胞免疫の証拠.
- N1-メチルプセウドウリジンによるリボソームの停滞がフレームシフトの原因である.
- 同義的なシーケンスのターゲティングは,フレームシフトされた製品の生産を効果的に削減します.
結論:
- 改変されたリボヌクレオチド,特にN1-メチルプセウドウリジンは,mRNAの翻訳精度に影響を与え,リボソームのフレームシフトにつながります.
- 現行のmRNA SARS-CoV-2ワクチンは有害な結果が報告されていないが,これらの発見は将来のmRNA治療薬の潜在的非標的効果を強調している.
- 序列の最適化は意図しないタンパク質の生成を緩和し,mRNAベースの治療法の安全性と有効性を確保するために不可欠です.
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