A DNA Switch for Detecting Single Nucleotide Polymorphism within a Long DNA Sequence Under Denaturing Conditions |
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| Authors: | Wenqing Zhang Dr Jiuxing Li Prof?Dr Bruno Salena Prof?Dr Yingfu Li |
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| Institution: | 1. M.G. DeGroote Institute for Infectious Disease Research, Department of Biochemistry and Biomedical Sciences, DeGroote School of Medicine, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1 Canada;2. Department of Medicine, DeGroote School of Medicine, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1 Canada |
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| Abstract: | DNA 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. |
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| Keywords: | biosensors DNA detection DNAzymes molecular recognition nucleic acids single nucleotide polymorphism |
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