分割された無意味媒介のmRNA分解によってアクソン誘導の調節
Dilek Colak1, Sheng-Jian Ji, Bo T Porse
1Department of Pharmacology, Weill Medical College, Cornell University, New York, NY 10065, USA.
Cell
|June 11, 2013
まとめ
NMDは,mRNAの安定性を制御することによって,軸索内の局所的なタンパク質合成を調節する. このメカニズムは,Robo3.2.2のような主要な誘導受容体の発現に影響することによって,軸索経路発見を誘導します.
科学分野:
- 神経科学は神経科学である.
- 分子生物学は分子生物学である.
- 発達生物学 発達生物学とは
背景:
- アクソン誘導は,細胞外信号に対する成長の反応に依存しています.
- 軸索伝達 RNAs (mRNAs) の局所翻訳は,成長コーンの反応にとって極めて重要です.
- 地元の翻訳を規制するメカニズムは,ほとんど不明のままです.
研究 の 目的:
- 軸索における局所変換の調節を調査する.
- 軸索経路の発見におけるナンセンス媒介 mRNA 崩壊 (NMD) の役割を決定する.
- 脊髄中線交差の際にRobo3.2の合成がどのように制御されるかを明らかにする.
主な方法:
- コムシチュラルニューロン軸索内のロボ3.2受容体の局所合成を調査した.
- 床板の信号がRobo3.2の翻訳に与える影響を調べました.
- Robo3.2のトランスクリプトレベルと軸索軌道を調節するNMDの役割を評価した.
主要な成果:
- Robo3.2は軸索で局所的に合成され,その翻訳はフロアプレート信号によって誘発されます.
- ナンセンス媒介性衰退 (NMD) は,床板の軸索における Robo3.2 トランスクリプトを分解する.
- NMDの機能障害は,ミドルラインの交差後に異常な軸索軌道を導きます.
結論:
- ローカルトランスレーションはmRNAの安定性によって制御される.
- NMD (Nonsense-mediated decay) は局所的に作用し,軸索経路発見を制御する.
- NMDは,誘導受容体の局所合成を調節することによって,軸索誘導に影響を与えます.
関連する概念動画
Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
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...
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...
mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability
mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability


