関連する実験動画
Updated: May 12, 2026

10:25
Using the E1A Minigene Tool to Study mRNA Splicing Changes
Published on: April 22, 2021
マイナー・スピライソソームの初期の進化的起源
Anthony G Russell1, J Michael Charette, David F Spencer
1Department of Biochemistry and Molecular Biology, Dalhousie University, 5850 College Street, Halifax, Nova Scotia B3H 1X5, Canada.
Nature
|October 20, 2006
まとめ
ユカリオットにおけるU12型イントロンの除去に不可欠なマイナー・スピライソソームは,様々な微生物と真菌で発見されています. これは,マイナー・スピライソソームが,真核生物の進化の初期に発生したことを示唆している.
科学分野:
- 分子生物学は分子生物学である.
- 進化生物学の進化生物学について
- ゲノミクスゲノミクスとは
背景:
- マイナー・スピライソソームは,ユカリオットのmRNAからU12型イントロンを除去する.
- 主要なスプライセソームのsnRNAに類似するユニークなRNA成分が含まれています.
- 以前は動物や植物に見つかっていたが,検出が限られているため,その進化の歴史は不明だった.
研究 の 目的:
- マイナー・スピライソソームの進化的起源を調査する.
- 少数のエウカリオット系統におけるマイナー・スプライセソーム成分とU12型イントロンを特定する.
- この本質的な複合体の初期の進化史を明らかにするために.
主な方法:
- ゲノムデータのバイオ情報分析.
- マイナー・スピライソソーム特異性タンパク質およびsnRNAの同類体の特定.
- 様々な真核微生物と真菌におけるU12型イントロンの検出.
主要な成果:
- 小型のスプライセソームタンパク質とsnRNAの同類体は,原生体とキノコRhizopus oryzae.で確認された.
- U12型イントロンも,これらの遠い親類の生物で発見されました.
- 証拠によると,マイナー・スピライソソームは,主要な真核超群全体に存在していることを示唆しています.
結論:
- マイナー・スピライソソームは,おそらく真核生物の進化の初期に発生した.
- その成分は,これまで考えられていたよりも広く存在しています.
- U12型イントロンとsnRNAの機能的に重要な配列要素は進化的に保存されています.
関連する概念動画
RNA 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...
RNA 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...
Alternative 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...
Pre-mRNA Processing: Modification of pre-mRNA Ends
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps the cell...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps the cell...
Pre-mRNA Processing: RNA 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...
Alternative 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...

