通过S2 AAVrh.10 体修饰的AAV载体提供的miRNA抑制中枢神经系统APOE4表达
Kalpita R Karan1, Slawomir Andrzejewski1, Katie M Stiles1
1Department of Genetic Medicine, Weill Cornell Medical College, New York, New York, USA.
Human gene therapy
|September 25, 2024
概括
同卵性阿波利波蛋白E4 (APOE4) 基因型是早期阿尔茨海默病的主要风险因素. 这项研究开发了一种腺相关病毒 (AAV) 系统,以传递抑制中枢神经系统 (CNS) 中APOE4表达的微RNA (miRNA).
科学领域:
- 神经科学是一个神经科学.
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 同卵性阿波利波蛋白E4 (APOE4) 基因型是早期阿尔茨海默病 (AD) 的主要遗传风险因素.
- 降低APOE4的表达在小鼠模型中拯救AD相关的表型方面表现出有希望.
- 用microRNAs (miRNAs) 针对APOE mRNA提供了一个潜在的策略,用于中枢神经系统 (CNS) 中的基因沉默.
研究的目的:
- 开发和评估一种由腺相关病毒 (AAV) 介导的传递系统,用于抑制中枢神经系统中APOE4的表达.
- 识别有效的针对APOE mRNA的miRNA并优化AAV囊体,以增强神经元和质转导.
- 评估 APOE4 mRNA 抑制在相关小鼠模型海马中的疗效.
主要方法:
- 在细胞系中选了9个miRNA以获得最佳的APOE抑制 (HEK293T, Huh7).
- 设计了一种AAV变体 (AAV.S2),它改善了神经元和质细胞的热带性,并增强了大脑的分布.
- 通过AAV.S2向TRE4小鼠的海马体输送了针对APOE4的双miRNA表达盒.
主要成果:
- 两个miRNAs,mir2A和mirN4,证明了最佳的APOE抑制.
- 与AAVrh.10.10相比,改造的AAV.S2囊显著增强了miRNA表达 (2.31倍).
- 单次海马内注射AAV.S2抑制了海马APOE4mRNA的76.5%,明显高于野生型AAVrh.10 (41.3%).
结论:
- 一个AAV.S2传递的表达盒带有两个不同的miRNA有效地抑制中枢神经系统中的APOE4mRNA.
- 这种方法有可能用于治疗APOE4相关的神经退行性疾病的治疗干预.
- 经过工程设计的AAV.S2囊体在中枢神经系统基因治疗应用中表现出卓越的传递效率.
更多相关视频
06:51Systemic Delivery of MicroRNA Using Recombinant Adeno-associated Virus Serotype 9 to Treat Neuromuscular Diseases in Rodents
Published on: August 10, 2018
7.6K
09:17Combining Optogenetics with Artificial microRNAs to Characterize the Effects of Gene Knockdown on Presynaptic Function within Intact Neuronal Circuits
Published on: March 14, 2018
10.2K
相关概念视频
Experimental RNAi
6.1K
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
6.1K
MicroRNAs
3.0K
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
3.0K
