单链RNAs使用RNAi强有力地和等位基因选择性地抑制突变的亨廷丁表达
Dongbo Yu1, Hannah Pendergraff, Jing Liu
1Departments of Pharmacology and Biochemistry, UT Southwestern Medical Center, 6001 Forest Park Road, Dallas, TX 75390-9041, USA.
Cell
|September 4, 2012
概括
新的单链siRNAs (ss-siRNAs) 提供了一种强大且对等位基因有选择性的方法来沉默突变的亨廷丁 (HTT) 蛋白质,解决亨廷顿病 (HD) 的根本原因. 这种基于RNAi的疗法对临床开发具有前景.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 亨廷顿病 (HD) 是一种致命的神经退行性疾病,由突变的亨廷丁 (HTT) 蛋白质引起.
- 目前对HD的治疗方法有限,这凸显了针对疾病遗传起源的治疗方法的需要.
- 开发有效的基于核酸的基因沉默疗法存在重大挑战.
研究的目的:
- 通过将反意义寡核酸简单性与RNA干扰 (RNAi) 效率相结合,开发一种针对亨廷顿病的新型基因沉默方法.
- 调查单链siRNAs (ss-siRNAs) 作为突变HTT表达的有力和等位基因选择性抑制剂的潜力.
- 在亨廷顿病的小鼠模型中评估ss-siRNAs的体内疗效.
主要方法:
- 设计和合成具有战略不匹配基的化学修饰的单链siRNAs (ss-siRNAs).
- 在体外评估患者衍生细胞中的ss-siRNA强度和等位基选择性.
- 通过RNA干扰 (RNAi) 途径对ss-siRNA的功能验证,包括阿尔戈诺特蛋白质依赖.
- 在亨廷顿病的小鼠模型中,通过静脉管内注射在体内输送ss-siRNAs.
主要成果:
- ss-siRNAs表现出突变HTT表达的强烈抑制,超过未经修改的RNA的100倍以上.
- ss-siRNAs表现出高的等位基因选择性,在突变和野生型HTT等位基因之间进行了超过30倍的区别.
- 在ss-siRNAs中不匹配的基位位置对于微型RNA类似的识别和等位基因歧视至关重要.
- 静脉内输注ss-siRNAs导致选择性沉默突变HTT等位基因在体内整个大脑.
结论:
- 经过化学修饰的ss-siRNAs通过RNAi途径有效地进行强效和等位基因选择性基因沉默.
- ss-siRNAs代表了亨廷顿病的有前途的治疗策略,针对疾病的根本原因.
- 这些发现为ss-siRNAs作为亨廷顿病治疗的临床开发提供了基础.
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