与早期阿尔茨海默病相关的异构性功能丧失PSEN1变体的奇怪案例
Research square
|September 5, 2025
概括
一种新的Presenilin-1 (PSEN1) 突变,c.325A>T (p.K109*),通过产生截断的PSEN1片段,导致早期阿尔茨海默病 (EOAD). 这种变异不会导致功能完全丧失,但会影响玛分泌酶活性和Aβ比率.
科学领域:
- 神经科学
- 遗传学
- 分子生物学
背景情况:
- 超过300种Presenilin-1 (PSEN1) 突变与早期阿尔茨海默病 (EOAD) 有关.
- 已知的PSEN1突变改变了玛分泌酶功能,增加了粉样β (Aβ) 长/短的比率.
研究的目的:
- 识别和描述一种与EOAD相关的新型异构性PSEN1无意义变异,c.325A>T (p.K109*).
- 研究这种突变对PSEN1蛋白碎片和玛分泌酶活性的功能后果.
主要方法:
- 在EOAD患者中发现了一种新的PSEN1无意义变异 (c.325A>T,p.K109*).
- 使用过度表达模型和异构小鼠模型进行功能性表征.
- 分析了PSEN1的C端片段生成,并评估了对粉样前体蛋白 (APP) 处理和Aβ比率的影响.
主要成果:
- c.325A>T 变种产生了一个截断的 N-终端 PSEN1 片段 (p.K109*).
- 下游启动码子产生PSEN1的C端片段 (PSEN1-CTFA和PSEN1-CTFB) 保持催化酸盐.
- 在老年小鼠中,Psen1K109*/+小鼠表现出微妙的缺陷,包括Pen2的减少,轻度的APP- CTF积累和Psen2的增加,可能会提高Aβ42/Aβ38比率.
结论:
- PSEN1 c.325A>T (p.K109*) 突变不是一个完全失去功能的突变.
- 通过需要进一步阐明的机制,这种突变有助于EOAD的发病.
- 改变的PSEN1片段和Psen2上调可能会影响EOAD中的玛分泌酶活性和Aβ产生.
更多相关视频
09:38Generalized Psychophysiological Interaction PPI Analysis of Memory Related Connectivity in Individuals at Genetic Risk for Alzheimer's Disease
Published on: November 14, 2017
15.1K
09:37A Phenotyping Regimen for Genetically Modified Mice Used to Study Genes Implicated in Human Diseases of Aging
Published on: July 14, 2016
8.4K
相关概念视频
01:26Alzheimer's Disease: Overview
666
Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
666
01:11Genetic Lingo
104.5K
Overview
104.5K
02:41Lethal Alleles
15.7K
Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
15.7K
01:37Neural Regulation
39.8K
Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
39.8K