関連する実験動画
Updated: Jun 8, 2026
10:25
Using the E1A Minigene Tool to Study mRNA Splicing Changes
Published on: April 22, 2021
エクソン結合複合体は,DrosophilaにおけるMAPKと他の長いイントロンを含んだトランスクリプトのスライシングを制御する
Dariel Ashton-Beaucage1, Christian M Udell, Hugo Lavoie
1Institute for Research in Immunology and Cancer, Laboratory of Intracellular Signaling, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montreal, Quebec, H3C 3J7, Canada.
Cell
|October 16, 2010
まとめ
エクソン・ジャンクション・コンプレックス (EJC) は,MAPKを含む特定のトランスクリプトのスプライシングを制御することによって,遺伝子発現を調節する. この発見は,EJCがRAS/MAPKシグナル伝達経路における新たな役割を明らかにしている.
科学分野:
- 分子生物学は分子生物学である.
- 細胞シグナリング 細胞シグナリング
- RNA 生物学 RNA 生物学
背景:
- 信号伝達経路は,翻訳後の修正に依存しているが,コアコンポーネントの規制メカニズムはあまり理解されていない.
- エクソン・ジャンクション・コンプレックス (EJC) は,mRNAエクソン-エクソン・ジャンクションを結合し,スプライシング後のイベントに参加することが知られている.
研究 の 目的:
- 信号伝達経路におけるコアコンポーネントの発現を調節する要因を特定する.
- RAS/MAPKシグナル伝達におけるエクソン・ジャンクション・コンプレックス (EJC) の役割を調査する.
主な方法:
- RAS/MAPK信号伝達を調節する要因を特定するために,ドロソフィラのRNA干渉 (RNAi) スクリーンを実施しました.
- EJCが欠乏した細胞の全トランスクリプトームとRT-PCR分析を行いました.
主要な成果:
- RAS/MAPK経路における重要なレギュレータとして,エクソン・ジャンクション・コンプレックス (EJC) を特定した.
- EJCは,潜在的にエクソン定義を通じて,MAPKトランスクリプトの適切なスプライシングに不可欠であることを実証しました.
- MAPKを含む長いイントロンを含む遺伝子のスプライシングは,EJC活動に敏感であることが明らかになった.
結論:
- エクソン・ジャンクション・コンプレックス (Exon Junction Complex,EJC) は,トランスクリプトのサブセットのスプライシングを調節する上で新しい役割を果たします.
- MAPKレベルに関するEJCの規制は,RAS/MAPKのシグナリングに影響を与え,経路制御の新しい層を強調しています.
関連する概念動画
01:32RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
01:32RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
02:18Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
02:18Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
02:32Exon Recombination
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...
02:41Chromatin 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...
The chromatin structure, especially...