两个FTD-ALS基因汇聚在内体路径上,诱导TDP-43病理和退化
Wei Shao1, Tiffany W Todd1, Yanwei Wu1
1Department of Neuroscience, Mayo Clinic, Jacksonville, FL 32224, USA.
概括
前性痴呆和ALS涉及C9orf72和TBK1基因. C9orf72的聚合会损害TBK1,从而恶化神经退行和TDP-43病理.
科学领域:
- 神经科学
- 遗传学
- 分子生物学
背景情况:
- 前性痴呆和肌缩性侧面硬化 (FTD-ALS) 与C9orf72基因扩张和TBK1基因突变有关.
- 了解连接这些遗传因素的分子机制对于FTD-ALS病变至关重要.
研究的目的:
- 研究FTD-ALS中C9orf72聚合和TBK1激酶活性之间的功能关系.
- 阐明TBK1在与C9orf72重复扩张相关的神经退行症中的作用.
主要方法:
- 在细胞和小鼠模型中研究了对C9orf72 poly ((Gly-Ala) [poly ((GA)) 聚合的TBK1酸化和封存.
- 使用TBK1-R228H突变小鼠模型评估TBK1活性降低对多基因GA诱导的表型的影响.
- 研究了TDP-43病理中的内体路径的作用.
主要成果:
- 导致TBK1酸化,将其封存到内含体中,并丧失激酶活性.
- 在小鼠中降低了TBK1活性,加剧了多基因 GA诱导的TDP-43病理和内体功能障碍.
- 抑制内体路径促进了TDP-43的聚合,强调了它的重要性.
结论:
- 确定了连接C9orf72,TBK1和TDP-43的途径,连接FTD-ALS的关键方面.
- 结核基因1功能障碍和内体途径损伤是C9orf72介导的神经退行症的关键因素.
- 这项研究为了解FTD-ALS病变提供了统一的分子框架.
更多相关视频
07:14Optogenetic Phase Transition of TDP-43 in Spinal Motor Neurons of Zebrafish Larvae
Published on: February 25, 2022
6.1K
13:31Novel Atomic Force Microscopy Based Biopanning for Isolation of Morphology Specific Reagents against TDP-43 Variants in Amyotrophic Lateral Sclerosis
Published on: February 12, 2015
8.8K
相关概念视频
Export of Misfolded Proteins out of the ER
3.8K
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...
3.8K
Amyloid Fibrils
9.7K
Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
9.7K
Tail-anchoring of Proteins in the ER Membrane
3.1K
Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
3.1K
Enzyme-linked Receptors
79.4K
Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
79.4K
The Early Endosome: Endocytosis of Transferrin
3.4K
Essential proteins such as insulin or low-density lipoprotein (LDL) and micronutrients such as iron enter a eukaryotic cell through receptor-mediated endocytosis. Subsequently, the early endosomes fuse with the vesicles containing such receptor-ligand complexes and play a vital role in sorting the incoming ligands and receptors. While the ligands are either degraded inside the vesicle or released into the cytosol, their receptors are returned to the plasma membrane for further rounds of...
3.4K
