Rループ依存のプロモーター近接結末はゲノム安定性を確保する.
Congling Xu1, Chengyu Li2, Jiwei Chen1
1Fudan University Shanghai Cancer Center, Institutes of Biomedical Sciences, State Key Laboratory of Genetic Engineering, Shanghai Key Laboratory of Medical Epigenetics, Shanghai Key Laboratory of Radiation Oncology, Human Phenome Institute, Fudan University, Shanghai, China.
Nature
|August 9, 2023
まとめ
単一鎖DNA (SOSS) とインテグレーターPP2A (INTAC) 複合体のセンサーは,ゲノムの安定性を維持するために転写を調節します. この複合体はRループの蓄積を防止し,DNAの損傷を防止し,細胞の機能を確保するために不可欠です.
科学分野:
- 分子生物学
- 遺伝学
- 細胞生物学
背景:
- トランスクリプションの調節はゲノムの整合性と細胞機能に不可欠です.
- RループはDNA-RNAのハイブリッドで 適切に解消されない場合 ゲノムの不安定化につながる可能性があります
研究 の 目的:
- SOSS と INTAC の間の機能的関連を特定し,特徴づけること.
- SOSS-INTACがRループの蓄積を防止し,ゲノム安定性を維持するメカニズムを解明する.
主な方法:
- SOSSとINTACとの間の安定した関連性を確認するために生化学分析.
- 変異したSOSS-INTAC成分を持つ細胞における転写終結とRループレベルの分析.
- SOSS-INTAC機能と凝縮物形成におけるSSB1の役割を調査する.
主要な成果:
- 安定したSOSS- INTAC複合体が特定され,SSB1による単一鎖DNA認識により結合した.
- SOSS- INTACはプロモーターでの転写終結を促進し,Rループを弱める.
- SSB1が液体のような凝縮物を形成する能力は,Rループの衰弱を高めます.
- SSB1の喪失または変異は,広範囲にわたるRループの蓄積とゲノム不安定につながります.
結論:
- SOSS-INTAC複合体は ゲノム監視メカニズムとして機能します
- SOSS-INTACによるプロモーターでのタイムリーな転写終了は,Rループの蓄積を制限する.
- この経路はゲノムの安定性を維持するために不可欠です
関連する概念動画
Transcription Attenuation in Prokaryotes
15.5K
Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure. Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
15.5K
Bacterial Transcription
28.5K
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:
28.5K
Prokaryotic Gene Structure and Organization
78
Prokaryotic genomes exhibit a streamlined organization of coding and non-coding regions essential for gene expression and protein synthesis. While coding regions contain the genetic instructions for proteins or functional RNAs, non-coding regions regulate the precise transcription and translation of these genes.Coding Regions: Proteins and RNAsThe primary coding regions, known as structural genes, include sequences transcribed into messenger RNA (mRNA) and ultimately translated into...
78
RNA Stability
33.7K
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...
33.7K
Replication in Eukaryotes
14.0K
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
14.0K
The Eukaryotic Promoter Region
16.4K
The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
16.4K


