工程 tRNA 抑制细胞和体内无意义突变
Suki Albers1, Elizabeth C Allen2, Nikhil Bharti1
1Institute of Biochemistry and Molecular Biology, University of Hamburg, Hamburg, Germany.
Nature
|May 31, 2023
概括
研究人员开发了工程转移RNAs (tRNAs) 来抑制无意义突变,这是遗传疾病的常见原因. 这种新疗法恢复了小鼠和人类细胞的功能性蛋白质产生,
科学领域:
- 遗传学
- 分子生物学
- 生物技术
背景情况:
- 无意义的突变导致~11%的遗传性疾病通过创建过早终止子 (PTC).
- 目前基于tRNA的无意义突变疗法缺乏最佳的疗效和安全性.
- 对于那些由无意义突变引起的遗传疾病, 没有有效的治疗方法.
研究的目的:
- 开发一种有效且安全的抑制性tRNA (sup-tRNA) 治疗由无意义突变引起的遗传疾病.
- 通过优化其特定氨基酸性质的序列,将原生tRNA微调为sup-tRNA.
- 在临床前模型中评估sup- tRNA治疗的疗效和安全性.
主要方法:
- 通过微调它们的序列,将原生tRNA转化为sup-tRNA.
- 在小鼠中通过脂质纳米颗粒 (LNP) 静脉和内注射sup- tRNAs.
- 在细胞和患者衍生模型中评估了蛋白质恢复,通过使用核糖体概况的原生停止编码,以及CFTR功能.
主要成果:
- 在具有无意义突变的小鼠中,脂质纳米颗粒传递的sup-tRNA恢复了功能性蛋白质的产生.
- 在内源性原生停止码子中没有明显的读透,这表明特异性很高.
- 在相关模型中,sup- tRNA恢复了囊性纤维化跨膜导电性调节器 (CFTR) 基因表达和功能,恢复了呼吸道平衡.
结论:
- 设计的sup-tRNAs代表了治疗无意义突变引起的遗传疾病的潜在治疗框架.
- 这种基于tRNA的基因治疗方法显示出高分子安全性和向疗效.
- 这些发现为开发新疗法铺平了道路,
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