関連する実験動画
Updated: Jun 15, 2026
06:35
A Scalable, Cell-Based Method for the Functional Assessment of Ube3a Variants
Published on: October 10, 2022
アンジェルマン症候群のタンパク質Ube3Aは,ユビキチナリング・アークによってシナプスの発達を調節する
Paul L Greer1, Rikinari Hanayama, Brenda L Bloodgood
1Department of Neurobiology, Harvard Medical School, 220 Longwood Avenue, Boston, MA 02115, USA.
Cell
|March 10, 2010
まとめ
アンジェルマン症候群と自閉症スペクトル障害 (ASD) は,Ube3A遺伝子変異を含む. この研究では,Ube3Aがシナプス結合を調節し,その障害がAMPA受容体に影響することで認知機能を損なうことが示されています.
科学分野:
- 神経科学は神経科学である.
- 遺伝学 遺伝学とは
- 発達生物学 発達生物学について
背景:
- アンジェルマン症候群 (AS) は,Ube3A遺伝子変異に関連した神経学的疾患です.
- Ube3A変異は,自閉症スペクトル障害 (ASD) とも関連しています.
- 神経系発達と認知障害におけるUbe3Aの正確な役割は不明である.
研究 の 目的:
- 神経細胞活動とシナプスの発達におけるUbe3Aの役割を調査する.
- Ube3A変異がASおよびASDにおける認知欠陥にどのように寄与するかを理解する.
主な方法:
- 経験主導のニューロンの活動と,Ube3Aの転写に対するその効果を検証した.
- 興奮シナプス発達のUbe3Aの調節を調査した.
- Ube3Aの破壊がArcタンパク質の分解とAMPA受容体のレベルに与える影響を評価した.
主要な成果:
- ニューロンの活動は,Ube3Aの転写を誘導する.
- Ube3Aは,Arcの劣化を制御することによって,刺激性シナプスの発達を調節する.
- 破壊されたUbe3A機能はArc発現を増加させ,シナプスのAMPA受容体を減少させます.
結論:
- シナプスにおけるAMPA受容体発現の緩和は,エンジェルマン症候群とASDにおける認知機能不全の根底にある可能性があります.
- Ube3Aはシナプス可塑性や認知機能において重要な役割を果たしています.
関連する概念動画
02:23RNA Editing
RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
01:32Export of Misfolded Proteins out of the ER
After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
02:58Regulated Protein Degradation
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
01:37The Unfolded Protein Response
The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
00:50Anaphase Promoting Complex
The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
01:13The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...