関連する実験動画
Updated: May 18, 2026

09:20
CRISPR-Mediated Reorganization of Chromatin Loop Structure
Published on: September 14, 2018
遺伝子ループは,転写方向性を強化する
Sue Mei Tan-Wong1, Judith B Zaugg, Jurgi Camblong
1Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK.
まとめ
積極的に転写されたmRNA遺伝子によって形成される遺伝子ループは,ノンコーディングRNA (ncRNA) の合成を制限する. Ssu72タンパク質または遺伝子ループの無活性化により,異なったncRNAの生成が増加し,転写方向性を強制します.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- 遺伝子規制 遺伝子規制
背景:
- ユカリオットのゲノムは,広範囲にわたる転写を経て,メッセンジャーRNA (mRNA) とノンコーディングRNA (ncRNA) を生成する.
- 非コーディングRNAはしばしば双方向プロモーターから発生し,逆方向の転写につながります.
- 変異転写の調節を理解することは,ゲノム発現を理解するために極めて重要です.
研究 の 目的:
- 変異転写の調節における遺伝子ループ構成の役割を調査する.
- プロモーター関連ncRNAsの合成に対するSsu72タンパク質の影響を決定する.
- 活発に転写された遺伝子が転写の方向性に影響を与える方法を明らかにする.
主な方法:
- 活発に転写されたmRNA遺伝子の遺伝子ループ形成の分析.
- 転写調節におけるSsu72タンパク質の機能を調査する.
- Ssu72の無活性化や遺伝子変異によるSsu72制限トランスクリプト (SRT) の合成の評価.
主要な成果:
- 活発に転写されたmRNA遺伝子は,異なったncRNA転写を制限する遺伝子ループ構成を採用します.
- 遺伝子ループ形成の重要な要因であるSsu72タンパク質の無活性化により,SRT合成が著しく増加します.
- 変異による個々の遺伝子ループの破壊も,SRT生産の強化につながります.
- 遺伝子ループコンフォームは,双方向プロモーターの転写方向性を強制する.
結論:
- 遺伝子ループ形成は,異なった転写を制御し,転写方向性を維持するための重要なメカニズムです.
- Ssu72タンパク質は,遺伝子ループの確立と維持に重要な役割を果たし,cnRNA合成を抑制します.
- これらの発見は,コーディングRNAとノンコーディングRNAの正確な発現を保証する新しい遺伝子調節層を明らかにしています.
関連する概念動画
Transcription Elongation Factors
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
Transcription Elongation Factors
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
Cooperative Binding of Transcription Regulators
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
Cooperative Binding of Transcription Regulators
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
Bacterial Transcription
RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are: