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分子信标的内分子加速组装:一种基于DNA纳米架构的空间封闭策略,旨在实现终端脱氧核酸转移酶生物传感

Qi Wang^1,2, Baoqiang Chen², Dan Zheng²

¹Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Anhui Hefei, 230601, P. R. China.

Analytical chemistry

|August 25, 2023

概括

这项研究提出了一种新的方法,用于检测使用3DDNA纳米架构的终端脱氧核样转移酶 (TdT) 活性. 这种方法通过增强TdT检测,使白血病的快速,敏感和具体诊断成为可能.

科学领域:

生物化学和分子生物学
纳米技术纳米技术
临床诊断临床诊断临床诊断

背景情况:

终端脱核样转移酶 (TdT) 是血液病理学中用于白血病诊断的关键生物标志物.
现有的TdT检测方法在速度,灵敏度或稳定性方面可能受到限制.
在DNA纳米结构中的空间限制效应为增强的分子分析提供了潜力.

研究的目的:

开发一种使用3D DNA纳米架构分析TdT活动的快速实时方法.
为了利用空间限制来加速分子信标 (MB) 组装和改进TdT检测.
为了提高TdT检测的灵敏度,特异性和生物稳定性,用于临床应用.

主要方法:

通过交联网络混合化链反应 (HCR) 设计了一个3D DNA纳米架构.
结合分子信标 (MBs) 与聚乙胺 (poly-T) 循环在DNA纳米架构上.
利用空间限制效应来增加本地MB度,并促进TdT触发组装.

主要成果:

通过模板独立的腺因核酸的结合来检测TdT活性,产生多A链.
在纳米架构上,Poly-A链迅速触发了MBs的分子内加速组装.
观察到显著的,时间依赖的光增强,表明具有高灵敏度和特异性的强大的TdT检测.

结论:

三维DNA纳米架构有效地利用空间限制来加速TdT检测的反应动力学.
开发的MB-DNA纳米架构表现出增强的核酶抗性,确保信号稳定性.
该战略为临床诊断中快速,灵敏,特定和生物稳定的TdT检测提供了一个有前途的平台.

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