Designed thiazole orange nucleotides for the synthesis of single labelled oligonucleotides that fluoresce upon matched hybridization
作者:Lucas Bethge、Ishwar Singh、Oliver Seitz
DOI:10.1039/c000697a
日期:——
However, most previously reported dye–DNA conjugates showed only little if any difference between the fluorescence of the single and the double stranded state. Here, we introduce a TO-containing acyclic nucleotide, which is coupled during automated oligonucleotide synthesis and provides for the desired fluorescence-up properties. The study reveals the conjugation mode as the most important issue. We show
诊断和基础研究中使用能够检测特定DNA序列的探针分子。大多数方法依赖于杂交反应的特异性,这使低温下单碱基突变的检测复杂化。在寡核苷酸的开发方面已经做出了巨大的努力,该寡核苷酸可以在匹配和错配探针-靶标复合物共存的温度下区分单碱基突变。包含对环境敏感的荧光染料(例如噻唑橙(TO))的寡核苷酸可提供单核苷酸特异性荧光。但是,大多数以前报道的染料-DNA偶联物在单链和双链状态的荧光之间仅显示出很小的差异。在这里,我们介绍一个包含TO的无环核苷酸,在自动化寡核苷酸合成过程中偶联,并提供所需的荧光增强特性。研究揭示了共轭模式是最重要的问题。我们展示了一种设计,该设计导致未结合的探针(背景)的荧光较低,但允许TO在探针-靶标复合物形成后采用荧光结合模式。在这些探针中,到取代规范的核碱基。请注意,“到当基本不匹配的位置紧邻时,“ – base”保持较低。