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紧的RNA编辑器具有自然微型Cas13j核酶

Guo Li^1,2,3, Yaxian Cheng^4,5, Jingwen Yu^4,6

¹ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou, China. isidore@zju.edu.cn.

Nature chemical biology

|September 19, 2024

概括

研究人员发现了用于基因治疗的小型Cas13jRNA编辑系统. 这些通过腺相关病毒 (AAV) 传递的紧基编辑器成功地纠正了细胞和体内致病突变.

科学领域:

分子生物学分子生物学
基因编辑基因编辑
生物技术是生物技术.

背景情况:

在RNA编辑方面,CRISPR-Cas13系统非常有价值.
较大的效应器尺寸限制了RNA编辑疗法的腺相关病毒 (AAV) 传递.
开发更小,更有效的RNA编辑工具对于治疗应用至关重要.

研究的目的:

为了识别和描述用于RNA编辑的新型,小型化的CRISPR-Cas13效应器.
开发与单个AAV包装兼容的紧型RNA基编辑器.
证明这些系统在纠正致病突变方面的治疗潜力.

主要方法:

Cas13j家族的识别和特征,包括LepCas13j和ChiCas13j.
通过将dChiCas13j与hADAR2dd融合,构建一个紧的RNA基编辑器 (Chi-RESCUE-S).
在体外和体内验证RNA编辑效率和特异性的验证.
使用单个AAV向量的编辑系统的交付.

主要成果:

Cas13j家族,特别是ChiCas13j (424 aa),代表了最小和高效的RNA干扰变体.
Chi-RESCUE-S实现了高效和特定的A-to-G和C-to-URNA基编辑.
该系统启用了单个AAV包装,并纠正了致病突变 (APOC3^D65N,SCN9A^R896Q).
在小鼠中使用Chi-RESCUE-S-mini3进行PCSK9的体内C-to-U编辑,降低了胆固醇水平.

结论:

Cas13j家族提供了紧而高效的RNA编辑工具.
基于Cas13j的小型基层编辑器与治疗应用的单个AAV交付兼容.
这些系统有望通过体内RNA编辑来治疗遗传疾病.

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Published on: September 8, 2012

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