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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Fluorescence in situ hybridization, or FISH, was developed in the early 1980s and has quickly become one of the most widely used techniques in cytogenetics. Labeled probes are used to bind complementary DNA or RNA sequences on a chromosome or in a region within a cell. Earlier, the probes could only be obtained by cloning or reverse transcription of a DNA template. Currently, the probe oligonucleotides can be synthesized synthetically. Additionally, with the advancement of optical techniques,...
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基于四面体DNA框架的复合光编码技术用于逻辑区分和多重识别.

Xiaoshuang Zhao1,2,3, Yi Xu1, Ning Dai2,3

  • 1Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050 China.

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概括

一种新的复合光编码技术 (CFET) 使用DNA框架和染料进行多重生物分析. 这种方法使精确的细胞系分化和在体外和活细胞中同时检测多个微RNA成为可能.

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科学领域:

  • 生物技术是生物技术.
  • 分子生物学分子生物学
  • 纳米技术 纳米技术

背景情况:

  • 多复合生物分析对于疾病的诊断和治疗至关重要.
  • 目前的方法面临着对复杂生物系统的特异性和灵敏性的挑战.

研究的目的:

  • 开发一种新的复合光编码技术 (CFET),用于先进的多重生物分析.
  • 证明CFET在生物样本的同时检测和分化方面的能力.

主要方法:

  • 使用四面体DNA框架 (TDF) 作为载体和四种Alexa Fluor染料进行复合光编码.
  • 开发了69个不同的CFET代码,根据不同的染料类型和TDF上的数字.
  • 构建了CFET探针,用于在体内同时检测特定的微RNA (miRNA) 和用于细胞系歧视的应用逻辑门.

主要成果:

  • 实现了五种具有高特异性和灵敏性的miRNA的多重检测 (LOD = 1 nM).
  • 通过基于miRNA表达水平的光成像成功区分了三个乳腺细胞系 (MCF-10A,MCF-7,MDA-MB-231).
  • 通过合并的光色彩在单细胞水平上证明了miRNA身份的解码.

结论:

  • CFET提供了一个多功能平台,用于体外和活细胞中的多重标签.
  • 该技术显示出在细胞分化和复杂生物分子识别方面的应用潜力显著.