RIG-Iは,ネガティブな鎖のRNAウイルス感染中にウイルスゲノムRNAを検出します
Jan Rehwinkel1, Choon Ping Tan, Delphine Goubau
1Immunobiology Laboratory, Cancer Research UK London Research Institute, 44 Lincoln's Inn Fields, London WC2A3PX, UK.
Cell
|February 11, 2010
まとめ
レチノ酸誘導性遺伝子I (RIG-I) はRNAウイルスを検出し,インターフェロン生成を誘発する. この研究は,他のRNA型ではなく,フル・レングスウイルスゲノムのみが,感染中にRIG-Iを活性化し,先天的な免疫反応を開始することを明らかにしています.
科学分野:
- 免疫学 免疫学とは
- ウイルス学 ウイルス学 ウイルス学
- 分子生物学は分子生物学である.
背景:
- RIG-Iは,RNAウイルスの検出と,その後のインターフェロン誘導のための重要なセンサーです.
- ウイルスの感染中に自然発生するRIG-I活性化RNA (アゴニスト) の正確な性質は不明である.
- 潜在的なRIG-Iアゴニストには,ウイルスゲノム,複製中間体,トランスクリプト,または宿主RNA断片が含まれます.
研究 の 目的:
- ウイルスに感染した細胞におけるインターフェロン誘導に責任を負う特定の生理学的RIG-Iアゴニストを特定する.
- インフルエンザAと仙台ウイルス感染症中のRIG-I活性化に対する異なるRNA種の相対的な貢献度を決定する.
主な方法:
- RIG-Iの活性化を調査するために,3つの異なる実験的アプローチを使用しました.
- インフルエンザAウイルスと仙台ウイルスに感染した細胞は,自然感染条件を模倣する.
- RIG-Iアゴニストを特定するために,感染した細胞に存在するRNA種を分析した.
主要な成果:
- RIG-Iアゴニストは,ウイルス複製過程でのみ生成されます.
- ウイルスの全長ゲノムが,主要なRIG-Iアゴニストとして特定されました.
- 非遺伝的ウイルスのトランスクリプト,短い複製中間体,分裂した自己RNAは,RIG-Iの活性化に実質的に寄与しなかった.
結論:
- 5'-トリフォスファートを含む単一鎖のウイルスRNAゲノムは,天然のRIG-Iアゴニストです.
- これらのウイルスゲノムは,RNAウイルスに対する細胞内在の本質的な先天性免疫反応を誘発する.
- この発見は,負鎖RNAウイルスに対する反応として,RIG-I活性化のメカニズムを明確にします.
関連する概念動画
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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
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This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
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RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
siRNA - Small Interfering RNAs
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
Experimental RNAi
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...


