クリプティックなpol IIトランスクリプトは,新しいpoly (A) ポリメラーゼを含む核品質管理経路によって分解される
Françoise Wyers1, Mathieu Rougemaille, Gwenaël Badis
1Equipe Labelisée La Ligue, Avenue de la Terrasse, 91190 Gif sur Yvette, Paris, France.
Cell
|June 7, 2005
まとめ
研究者らは,いわゆる静かな酵母遺伝子の多くの領域が転写されていることを発見しました. これらの領域からのRNAは,エクソソームと新しいポリ (A) ポリメラーゼを含む品質管理メカニズムによって急速に分解され,遺伝情報の発現を制限します.
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 生物学 RNA 生物学
背景:
- 転写活性は,通常,RNA分子を検出することによって測定されます.
- ゲノムの表現された分子は,一般に,トランスクリプトームの複雑さと相関すると仮定されます.
研究 の 目的:
- S. cerevisiae ゲノム内の,おそらく静かなインタージェニック領域の転写活性を調査する.
- 新しく発見されたトランスクリプトの劣化に起因するメカニズムを特定する.
主な方法:
- 遺伝子間の領域からのトランスクリプトを識別するためのRNAシーケンシング.
- バイオケミカルアッセイは,ポリ (A) ポリメラーゼの活性性を特徴付けるためのものです.
- エクソソーム,Trf4,Air1p,Air2pのノックアウト株を含む遺伝子分析.
主要な成果:
- 以前は無声と考えられていたS. cerevisiaeのいくつかのインタージェニック領域は,RNAポリメラーゼIIによって転写されます.
- これらの新たに特定されたトランスクリプトは,エクソソームとTrf4/Air1pまたはTrf4/Air2pポリアデニレーション複合体を含むメカニズムによって急速に分解されます.
- このポリアデニレーション補助分解経路は,RNAポリメラーゼIとIIIのトランスクリプトを標的としている.
結論:
- S. cerevisiae ゲノムの発現した分子は,以前に推定されたより潜在的に大きい.
- ノンコーディングまたは不適切なトランスクリプトを劣化するために,ポストトランスクリプション品質管理メカニズムが存在します.
- ポリアデニレーションによる分解を伴うこのメカニズムは,遺伝子発現を調節する上で重要な役割を果たします.
関連する概念動画
Eukaryotic RNA Polymerases
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which 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...
Proteins: From Genes to Degradation
Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick. Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
Transcription is the synthesis of RNA molecules by RNA...
Transcription is the synthesis of RNA molecules by RNA...
Eukaryotic RNA Polymerases
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which 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...
Proteins: From Genes to Degradation
Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick. Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
Transcription is the synthesis of RNA molecules by RNA...
Transcription is the synthesis of RNA molecules by RNA...


