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通过Anabaena组I内突基无痕圆形RNA循环化的机制性见解
Bangda Fan1, Sujia Liu1, Yinghuan Xu1
1MOE Key Laboratory of Bio-Intelligent Manufacturing, School of Bioengineering, Dalian University of Technology, Dalian 116024, China.
Molecular therapy. Nucleic acids
|August 18, 2025
概括
这项研究引入了无痕循环RNA (circRNA) 生产,增强了治疗潜力. 无痕circRNA保持高效率和低免疫性,克服传统方法的局限性.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 在RNA治疗方面,RNA疗法.
背景情况:
- 循环RNA (circRNA) 由于其增强的稳定性和药理动力学,在治疗中比线性RNA具有优势.
- 目前的方法,如用于circRNA构造的变内子-外子 (PIE),引入痕序列,可能会影响效能和免疫性.
- 了解内子拼接机制对于改善circRNA合成至关重要.
研究的目的:
- 开发一种用于circRNA合成的无痕方法.
- 为了研究无痕circRNAs的免疫性.
- 评估改性核酸对circRNA功能的影响.
主要方法:
- 探索 Anabaena I 组内拼接的分子机制.
- 拼接部位序列的表征和IG序列识别规则.
- 标准的体外转录用于无痕的circRNA制备.
- 免疫性分析和修改核酸对翻译效应的评估.
主要成果:
- 通过使用已确定的体外转录,成功制备了具有高循环化效率的无痕circRNA.
- 没有痕的circRNAs表现出较低的免疫性,与自然存在的circRNAs一致.
- 即使在较低的百分比中,添加改性核酸也会显著损害拼接和内部核糖体进入部位 (IRES) 功能,损害翻译.
结论:
- 无痕 circRNA 生产是可行的,并保持治疗优势.
- 缺少痕序列并不会增加circRNA的免疫性.
- 改性核酸对包括拼接和翻译在内的基本circRNA功能产生负面影响,限制它们在当前水平上的治疗应用.
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