RNAの分解の多くの経路は,
Jonathan Houseley1, David Tollervey
1Wellcome Trust Centre for Cell Biology, University of Edinburgh, EH9 3JR, UK.
Cell
|February 26, 2009
まとめ
細胞はRNAを積極的に分解し,保存するよりも多くを転写する. 細胞機能に不可欠なこの制御されたRNA分解は,欠陥のある分子を標的とし,特定のRNA標的を認識するために不可欠です.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
背景:
- 細胞は,蓄積するよりも著しく多くのRNAを転写し,活性RNA分解経路を示します.
- RNAの降解は,リボソームRNA,メッセンジャーRNA,切断されたイントロンのような異なるRNAタイプの寿命が異なる規制されたプロセスです.
- 細胞監視メカニズムは,加工,折り畳み,またはタンパク質組立に欠陥があるRNA分子を識別し,迅速に分解します.
研究 の 目的:
- すべての細胞におけるRNA分解の至る所に存在し,不可欠な性質を強調する.
- 標的RNAを正確に認識するために,RNAの分解を正確に制御する必要性を強調する.
- RNA標的認識のメカニズムに関する分野における中心的な問いを特定する.
主な方法:
- RNAの生成と安定状態のレベルを比較した分析.
- 異なるRNA種におけるRNA分解パターンの観察.
- 細胞監視装置が欠陥RNAを特定する上で果たす役割の調査.
主要な成果:
- 細胞内の活発で広範なRNA分解システムの存在を裏付ける証拠があります.
- RNAの分解は厳格に規制されており,様々な種類のRNAの分解速度が異なります.
- 欠陥RNA分子は,細胞監視によって効率的に標的にされ,分解されます.
結論:
- RNAの分解は,すべての細胞タイプに共通する基本的な細胞プロセスです.
- 分解機構による標的RNAの正確な制御と認識は,細胞ホメオスタシスにとって極めて重要です.
- 降解中のRNA標的認識のメカニズムを理解することは,分子生物学における未解決の重要な問題である.
関連する概念動画
mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability
mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
RNA Stability
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
RNA Stability
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
Regulation of Expression at Multiple Steps
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...


