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A tetrahedral DNA nanoflare for fluorometric determination of nucleic acids and imaging of microRNA using toehold strands
Microchimica Acta ( IF 5.3 ) Pub Date : 2019-11-21 , DOI: 10.1007/s00604-019-3931-6
Liang Li 1 , Yingcai Meng 1 , Ling Li 2 , Shengfeng Wang 1 , Jinsong Ding 1 , Wenhu Zhou 1
Affiliation  

The authors describe a tetrahedral DNA nanostructure loaded with SYBR Green (SG-TDN) for fluorometric determination of nucleic acids. After intercalating into the TDN, fluorescence of SG is enhanced by 260-fold (exc 480 nm, em 524 nm), and the resulting SG-TDN nanoflare displays >7-fold stronger fluorescence than that of FAM-labeled TDN. The SG-TDNs were coupled to magnetic microparticles and polydopamine nanoparticles to construct multi-functional nanoprobes through sequence hybridization using a toehold strand. The method was applied to detect a stretch of microRNA sequence (20 bp) in buffer and in undiluted serum with excellent selectivity, over a wide linear range and with a low limit of detection (0.2 nM). The probe was also applied for visualization of tumor-related microRNA in living cells via fluorescence imaging. Graphical abstract Schematic representation of tetrahedron-based DNA nanoflare for fluorometric nucleic acid determination in undiluted blood serum and living cells. Schematic representation of tetrahedron-based DNA nanoflare for fluorometric nucleic acid determination in undiluted blood serum and living cells.

中文翻译:

四面体 DNA nanoflare 用于核酸的荧光测定和使用脚趾链的 microRNA 成像

作者描述了一种装载有 SYBR Green (SG-TDN) 的四面体 DNA 纳米结构,用于核酸的荧光测定。插入 TDN 后,SG 的荧光增强了 260 倍(ex 480 nm,em 524 nm),并且由此产生的 SG-TDN 纳米耀斑显示出比 FAM 标记的 TDN 强 7 倍以上的荧光。SG-TDNs 与磁性微粒和聚多巴胺纳米粒子偶联,通过使用脚趾链的序列杂交构建多功能纳米探针。该方法用于检测缓冲液和未稀释血清中的一段 microRNA 序列 (20 bp),具有出色的选择性、宽线性范围和低检测限 (0.2 nM)。该探针还用于通过荧光成像可视化活细胞中与肿瘤相关的 microRNA。用于未稀释血清和活细胞中荧光核酸测定的基于四面体的 DNA 纳米耀斑的图形摘要示意图。用于测定未稀释血清和活细胞中荧光核酸的基于四面体的 DNA 纳米耀斑的示意图。
更新日期:2019-11-21
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