Balbiani リング 1 遺伝子プレ-mRNAのスプライシングは,転写と同時に行われます
1Department of Cell and Molecular Biology, Medical Nobel Institute, Karolinska Institutet, Stockholm, Sweden.
Cell
|January 14, 1994
まとめ
バルビアーニ・リング1 (BR1) 遺伝子のイントロンの切除は,一部のイントロンの転写中に発生し,他のイントロンの放出後に発生します. これは,スプライソーム組成がインビヴォで共伝記であり,スプライシングのタイミングはイントロンの位置に依存することを明らかにします.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝子発現の表現について
- RNA 処理 RNA 処理
背景:
- Balbiani ring 1 (BR1) 遺伝子は,高転写率で知られている大きな遺伝子です.
- RNA処理のダイナミクス,特にイントロンの除去を理解することは,遺伝子発現の調節に不可欠です.
研究 の 目的:
- BR1前mRNA内のイントロンのイントロン切除のタイミングを直接調査する.
- 転写 (コトランスクリプションとポストトランスクリプション) の間または後にイントロンの除去が起こるかどうかを判断する.
主な方法:
- 新生および放出されたBR1プレ-mRNAの微分断.
- 孤立したプレ-mRNA分子からイントロンの切除を直接測定する.
主要な成果:
- プリ-mRNAの初期に位置するイントロン3は,転写と同時に切除されます.
- 転写から2.5分以内に,プレ-mRNAの50%がイントロン3を切除した.
- ポリアデニル化部位の近くにあるイントロン4は,混在した切除タイミングを示しています: 5-10%がコトランスクリプションで,残りの部分はポストトランスクリプションです.
結論:
- スプライソーム組立は,コトランスクリプションプロセスである in vivo.
- スプライシングは,転写中に発生するか,放出後に発生し,イントロンのゲノム位置の影響を受けます.
関連する概念動画
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RNA Splicing
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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...


