A DNA Switch for Detecting Single Nucleotide Polymorphism within a Long DNA Sequence Under Denaturing Conditions Journal Articles uri icon

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  • AbstractDNA detection is usually conducted under nondenaturing conditions to favor the formation of Watson–Crick base‐paring interactions. However, although such a setting is excellent for distinguishing a single‐nucleotide polymorphism (SNP) within short DNA sequences (15–25 nucleotides), it does not offer a good solution to SNP detection within much longer sequences. Here we report on a new detection method capable of detecting SNP in a DNA sequence containing 35–90 nucleotides. This is achieved through incorporating into the recognition DNA sequence a previously discovered DNA molecule that forms a stable G‐quadruplex in the presence of 7 molar urea, a known condition for denaturing DNA structures. The systems are configured to produce both colorimetric and fluorescent signals upon target binding.


  • Zhang, Wenqing
  • Li, Jiuxing
  • Salena, Bruno
  • Li, Yingfu

publication date

  • January 13, 2020