Inouye M, Ikeda R, Takase M, Tsuri T, Chiba J. Single-nucleotide polymorphism detection with "wire-like" DNA probes that display quasi "on-off" digital action.
Proc Natl Acad Sci U S A 2005;
102:11606-10. [PMID:
16087881 PMCID:
PMC1183446 DOI:
10.1073/pnas.0502078102]
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Abstract
Establishing a reliable genotyping protocol is a critical matter in post-sequence genetics. In this article, we describe a highly sensitive electrochemical detection of complementary DNAs (up to 43-mer) based on hole transport with molecular-scale, "wire-like" DNA probes. The presence of a single-base mismatch in the DNA duplexes caused a dramatic decrease in the electrochemical response. We applied this method to detect all of the possible transition and transversion SNPs and achieved "on-off"-type discrimination of fully complementary DNAs from their SNPs. Furthermore, naturally occurring polymorphisms, "hot spots" from the p53 gene, could clearly be distinguished from wild type by using our methodology.
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