関連する実験動画
Updated: Jun 22, 2026

10:59
Analysis of Translation Initiation During Stress Conditions by Polysome Profiling
Published on: May 19, 2014
まとめ
胚のクワイルドミオブラストは,分化時にリボソームの産生を調節する. 融合後,rRNA合成は継続するが,分解は増加し,筋肉繊維におけるリボソームの蓄積を減少させる.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 発達生物学 発達生物学とは
背景:
- リボソームは,タンパク質合成と細胞成長に不可欠です.
- リボソームのバイオゲネシスは,細胞の分化中に厳格に規制されています.
- rRNAのダイナミクスを理解することは,細胞の発達を理解するために不可欠です.
研究 の 目的:
- クワイルドミオブラストの分化におけるリボソーマルRNA (rRNA) の合成,蓄積,および安定性を調査する.
- ミオブラスト融合と繊維形成の間にリボソーム含有量を制御するメカニズムを解明する.
主な方法:
- 胚性クワイルドミオブラストの細胞培養.
- 3H-メチルメチオニンを用いて,rRNAの安定性を測定するパルスチェイス実験.
- rRNAとATPプールへの3H-アデノシンの組み込みを分析し,rRNA合成速度を評価する.
主要な成果:
- 分裂するミオブラストは,rRNAの蓄積と細胞分裂を一致させることで,リボソームの含有量を一定に保ちます.
- 合併後,筋肉繊維におけるリボソームの蓄積は著しく減少する (ミオブラストの分裂速度の4分の1まで).
- 分化繊維のrRNAの半減期は45時間であり,加工中の分解がリボソーム形成の減少の大きな部分を占めている.
結論:
- クイールのミオブラストは,分化時にリボソームの生体生成を調節する.
- 処理中にrRNAの分解が増加し,rRNAの周回とともに,筋肉繊維におけるリボソームの蓄積が減少することを説明します.
- これらの規制メカニズムは,分化細胞機能のための適切なリボソームレベルを確保します.
関連する概念動画
Regulation of Expression Occurs at Multiple Steps
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Regulated mRNA Transport
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...
Regulation of Expression Occurs at Multiple Steps
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Regulated mRNA Transport
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...
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...

