エンジニアリングされたtRNAは,細胞と体内の無意味な変異を抑制する
Suki Albers1, Elizabeth C Allen2, Nikhil Bharti1
1Institute of Biochemistry and Molecular Biology, University of Hamburg, Hamburg, Germany.
Nature
|May 31, 2023
まとめ
研究者達は遺伝子病の原因である 無意味な変異を抑制するために 設計されたトランスファーRNA (tRNA) を開発した. この新しい治療法により マウスとヒトの細胞で 機能するタンパク質の生成が回復し 新しい治療戦略が期待されます
科学分野:
- 遺伝学
- 分子生物学
- バイオテクノロジー
背景:
- 無意味な変異は 遺伝性疾患の ~11% を 早期終結コドン (PTC) を生み出すことによって引き起こします
- 無意味な変異に対する現在の tRNA ベースの治療法は,最適な有効性と安全性が欠けている.
- 無意味な変異によって引き起こされる遺伝疾患の 治療には効果がありません
研究 の 目的:
- 無意味な変異によって引き起こされる遺伝疾患に対する効率的で安全な抑制性tRNA (sup-tRNA) 治療を開発する.
- 特定のアミノ酸特性を最適化することで,ネイティブtRNAをsup-tRNAに微調整する.
- 臨床前モデルにおけるsup- tRNA療法の有効性と安全性を評価する.
主な方法:
- 配列を微調整することで,ネイティブtRNAをsup-tRNAに変換した.
- 脂質ナノ粒子 (LNP) を経由してマウスに静脈内および内投与した.
- リボソームプロファイリングを用いたネイティブストップコドンでの読み込みと,細胞および患者由来モデルにおけるCFTR機能の評価.
主要な成果:
- 脂質ナノ粒子の供給されたsup-tRNAは,無意味な変異を持つマウスで機能的なタンパク質の生産を回復した.
- 高特異性を示す,内生的なネイティブストップコドンで識別可能な読み込みは発生しなかった.
- sup- tRNAsは,気道ホメオスタシスを回復させ,関連するモデルにおいて,システィック線維症のトランスメブラン伝導性調節器 (CFTR) 遺伝子発現と機能を回復させた.
結論:
- 合成されたsup-tRNAは 無意味な変異によって引き起こされる 遺伝疾患の治療のための 潜在的な治療的枠組みを表しています
- このtRNAベースの遺伝子療法アプローチは,高分子安全性プロファイルと標的の有効性を示しています.
- この発見は,未解決の重要な医療ニーズに対する 新しい治療法の開発に道を開きます.
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