具有DNA框架桥接混合反应的超快DNA传感器
Fengqin Li1,2, Xiuhai Mao1, Fan Li1
1Institute of Molecular Medicine, Shanghai Key Laboratory for Nucleic Acid Chemistry and Nanomedicine, Renji Hospital, School of Medicine and School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200127, China.
Journal of the American Chemical Society
|May 6, 2020
概括
在生物传感器中增强DNA杂交. 使用DNA框架手柄延伸单链DNA (ssDNA) 显著提高了敏感DNA检测的速度和效率.
科学领域:
- 纳米技术
- 分子生物学
- 生物物理
背景情况:
- 细胞内DNA杂交发生在紧张状态下,但纳米力对体外DNA试验的影响尚不清楚.
- 现有的生物传感器缺乏对DNA延伸状态的有效控制.
研究的目的:
- 调查纳米力学力量如何影响体内测试中的DNA杂交效率.
- 开发一种基于DNA的新型纳米机械系统,用于增强DNA检测.
主要方法:
- 设计基于DNA框架的纳米机械手柄 (TDF) 来控制DNA的拉伸.
- 开发了使用TDF手柄捕获目标DNA的桥梁DNA传感器.
- 使用原子力显微镜和单分子光能量转移 (FRET) 测量DNA延伸.
主要成果:
- TDF处理保持单链DNA (ssDNA) 在拉伸状态,降低FRET的效率.
- 通过控制ssDNA拉伸,实现了超快的杂交动力 (在1分钟内) 和高效率 (∼98%).
- 已证明高灵敏度 (1 fM),特异性 (单次不匹配的歧视) 和选择性 (血清/血液检测).
结论:
- 通过纳米机械手柄控制DNA伸展状态可以显著提高杂交效率和动力学.
- 开发的桥梁DNA传感器为敏感和特定的生物分子检测提供了一个有前途的平台.
- 这种方法在生物传感器,生物成像和生物芯片中具有广泛的潜在应用.
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