関連する実験動画
Updated: Sep 9, 2025

10:25
Using the E1A Minigene Tool to Study mRNA Splicing Changes
Published on: April 22, 2021
5.0K
SpenとNitoは,E ((Spl) mγを翻訳的に抑制することによって,祖先の分化を防止する
bioRxiv : the preprint server for biology
|September 2, 2025
まとめ
SPEN族のタンパク質SpenとNitoは,不対称な幹細胞分裂中にノッチ信号を調節する. 幹細胞におけるノッチ標的E ((Spl) mγの翻訳を抑制し,子孫の適切な細胞運命を決定する.
科学分野:
- 発達生物学
- 細胞生物学
- 遺伝学
背景:
- 不対称な幹細胞分裂は 細胞の多様性を生み出すのに不可欠です
- 細胞の運命を決定する上で重要な役割を果たします.
- Numbタンパク質は不対称に分離し,子孫の分化におけるNotchシグナリングを終了する.
研究 の 目的:
- 非対称的な幹細胞分裂中のノッチ信号の調節におけるSPENファミリータンパク質 (SpenとNito) の役割を調査する.
- スペンとニトが幹細胞におけるノッチ標的E ((Spl) mγの発現を制御するメカニズムを解明する.
主な方法:
- モデルシステムとしてドロソフィラII型神経芽細胞を使用した.
- スペンとニトの機能喪失を 分析するために 遺伝学的研究を行いました
- E ((Spl) mγのSpenとNitoの結合および規制メカニズムを決定するために生化学的分析を行った.
主要な成果:
- SpenまたはNitoの喪失は,幹細胞におけるE ((Spl) mγの発現を増加させた.
- この増加は子孫の細胞の分化につながった.
- SpenとNitoは,E(Spl) mγ mRNAの5'UTRに直接結合し,その翻訳を抑制し,幹細胞の低レベルを維持する.
結論:
- SpenとNitoは,ノッチシグナル伝達のための新しいポストトランスクリプションの規制メカニズムを確立しました.
- このメカニズムは,幹細胞の低レベルのE ((Spl) mγを維持し,子孫による過剰な遺伝を防ぐために重要です.
- 適切な調節は,非対称的な幹細胞分裂の間に正しい細胞運命の仕様を保証します.
関連する概念動画
Nonsense-mediated mRNA Decay
10.8K
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,...
10.8K
Maintenance of the ES Cell State
2.2K
The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
2.2K
Regulation of Nuclear Protein Sorting
2.4K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.4K
Chromatin Structure Regulates pre-mRNA Processing
7.2K
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
7.2K
Alternative RNA Splicing
21.7K
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...
21.7K
Methods of Nuclear Reprogramming
1.9K
Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for...
1.9K

