関連する実験動画
Updated: May 10, 2026

12:29
mRNA Interactome Capture from Plant Protoplasts
Published on: July 28, 2017
まとめ
ベータ・グロービンのイントロンの点変異.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- RNA スプライシング
背景:
- RNAスプライシングは遺伝子発現の重要なプロセスです.
- イントロン内のスプライスサイトは,正確なスプライシングに不可欠です.
- ベータ・グロービン・イントロンには,スペライシングを調節する特定の配列が含まれています.
研究 の 目的:
- ウサギのベータ・グロービン・イントロンの5'および3'スペライス領域における点変異の機能的影響を調査する.
- これらの変異が splicing に与える影響を in vitro と in vivo で比較する.
主な方法:
- ウサギのベータ・グロービン・イントロンの5'および3'スプライス領域に24点の変異を導入した.
- in vitro splicing assaysを用いたスプライシング効率と精度の分析.
- ウサギにおけるインビボスプライシングアッセイを用いたスプライシング効率と精度の分析.
主要な成果:
- 3'AGスプライス部位の変異により,インビトロではスプライシングは廃止されたが,インビヴォでは神秘的な部位でのスプライシングにつながった.
- 5'スプライス領域の変異は,スプライシングを阻害し,in vitroでエクソンスキップを促進しました.
- In vivoでは,ほとんどの5'スプライス領域の変異は,5'GTを変化させ,ラリアットの中間蓄積を引き起こした変異を除いて,効果がなかった.
結論:
- 5'GT配列は5'分裂には欠かせないが,3'分裂とエクソン結合には重要な役割を果たしている.
- In vivo splicingでは,正規のスプライスサイトが破壊された場合,代替サイトを活用することができます.
- この研究は,splice siteのシーケンスにおけるin vitroとin vivoの差異的な要件を強調しています.
関連する概念動画
pre-mRNA Processing
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 to it (7-Methyl guanosine). This 5’ cap helps the...
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 to it (7-Methyl guanosine). This 5’ cap helps the...
Pre-mRNA Processing
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 to it (7-Methyl guanosine). This 5’ cap helps the...
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 to it (7-Methyl guanosine). This 5’ cap helps the...
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
Leaky Scanning
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
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...
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...

