関連する実験動画
Updated: Jun 3, 2026

11:53
Substrate Generation for Endonucleases of CRISPR/Cas Systems
Published on: September 8, 2012
CRISPR RNAの成熟は,トランスコードされた小RNAと宿主因子RNase IIIによって行われる
Elitza Deltcheva1, Krzysztof Chylinski, Cynthia M Sharma
1The Laboratory for Molecular Infection Medicine Sweden, Umeå, Sweden.
Nature
|April 2, 2011
まとめ
科学者たちは,Streptococcus pyogenesのようなバクテリアがCRISPRRNAを成熟させるのを助ける新しいRNA分子,tracRNAを発見しました. このトラクRNAは,RNase IIIとCsn1と共に,侵入ファグに対する細菌の免疫に不可欠である.
科学分野:
- 微生物学 微生物学とは
- 分子生物学は分子生物学である.
- バクテリア学 バクテリア学
背景:
- CRISPR/Casシステムは,外来遺伝子要素に対する細菌と古生物の適応免疫を提供します.
- crRNAの成熟はCRISPR/Casの機能に不可欠ですが,その酵素は全てのサブタイプに共通しているわけではありません.
- 多くの細菌種におけるcrRNA成熟の特定のメカニズムは,まだ完全に理解されていません.
研究 の 目的:
- ヒトの病原体Streptococcus pyogenesにおけるcrRNA成熟のメカニズムを調査する.
- S. pyogenes. のCRISPR/Cas媒介免疫に関与する新しい成分を特定する.
- バクテリアの適応免疫における小RNAの役割を明らかにする.
主な方法:
- Streptococcus pyogenesの差分RNA配列化について.
- 小型のRNA分子の識別と特徴付け.
- バイオケミカルアッセイは,crRNA成熟における特定されたRNAおよびタンパク質の機能を決定するものです.
- プロファージチャレンジアッセイは,細菌の免疫を評価するためのアッセイです.
主要な成果:
- S. pyogenes. でトランスコードされた小さなRNAであるtracrRNAの発見.
- tracrRNAがcrRNAの成熟のためにRNase IIIとCsn1を誘導することを実証.
- この新しい成熟経路に不可欠な宿主因子としてのRNase IIIの特定.
- S. pyogenesのプロファージDNAに対する防御には,tracrRNA,RNase III,Csn1が必要であることを確認する.
結論:
- バクテリアの適応免疫における小さなガイドRNAの成熟のための新しい経路が発見されました.
- 固有のRNase IIIはCRISPR/Cas媒介RNAサイレンシングにおける宿主因子として作用する.
- この発見は,CRISPR/Casシステムの多様性と規制に関する私たちの理解を広げています.
- 特定された経路は,ファグ感染に対するStreptococcus pyogenesの保護に不可欠です.
関連する概念動画
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...
CRISPR and crRNAs
Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
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...
CRISPR
Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced Short...
CRISPR
Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced Short...
Chromatin Structure Regulates pre-mRNA Processing
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
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