突变的sigma-1R破坏了dHMN患者细胞中的细胞平衡
Sofia Zanin1, Francesco Ciscato2,3, Antonio Petrucci4
1Laboratory for Genetics of Mitochondrial Disorders, UMR 1163, Institut Imagine, Université de Paris, Paris, France.
Cellular and molecular life sciences : CMLS
|April 9, 2025
概括
在sigma-1受体 (Sigma-1R) 的功能丧失突变导致遗传性运动神经病变. 患者的细胞表现出受损的平衡,突出显示了Sigma-1RR.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 遗传学 遗传学 是一个
背景情况:
- 遗传性运动神经病变 (dHMNs) 是一组影响外围运动神经元的遗传性疾病.
- 之前的研究确定了与dHMNs相关的特定sigma-1受体 (Sigma-1R) 变体 (p.E138Q,p.E150K),在细胞模型中表现出功能丧失特性.
研究的目的:
- 在初级患者纤维细胞中研究Sigma-1R E150K突变的功能后果.
- 在dHMNs的背景下阐明Sigma-1R在维持细胞平衡,器官间通信和信号传递中的作用.
主要方法:
- 生物化学测定 生物化学测定
- 基因表达分析 基因表达分析
- 免疫光显微镜的使用方法
- (Ca2+) 的成像成像.
- 来自同卵性E150K突变患者和对照组的初级纤维细胞的分析.
主要成果:
- 在患者的纤维细胞中,西格玛-1R的表达和定位发生了显著的改变.
- 患者的细胞表现出动力学受损,乱的内分泌网膜-线粒体连接,增加了自,并减少了线粒体代谢.
- 这些细胞功能障碍表明细胞平衡的总体乱.
结论:
- 西格玛-1R对于维持细胞和蛋白质平衡,器官间通信和细胞内信号传递至关重要.
- 像E150K一样,Sigma-1R中的功能丧失突变有助于dHMN患者的神经元退化.
- 针对Sigma-1R功能可能为dHMNs提供治疗潜力.
相关概念视频
Alternative RNA Splicing
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...
Exon Recombination
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Notch Signaling Pathway
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
Abnormal Proliferation
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
The Ras Gene
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...
Ras is a superfamily...
Role Of Notch Signalling In Intestinal Stem Cell Renewal
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...


