Selective Detection of 8-Oxo-2'-deoxyguanosine in Single-Stranded DNA via Nanopore Sensing Approach.

We have developed a nanopore sensing approach for the selective detection of 8-oxo-2'-deoxyguanosine (8-oxoG) in single-stranded DNA. First, 1,12-dodecanediamine is coupled with 8-oxoG-containing DNA molecules in high yield which leaves a free amine group for subsequent attaching of an adamantane moiety. After incubation with cucurbit[7]uril, the host-guest complex-modified DNA hybrid is translocated through an α-hemolysin nanopore. Highly characteristic events can be recorded and used to quantify the 8-oxoG-DNA content in a DNA mixture. Compared with the existing methods, this study provides a reliable, quick, and low-cost approach for the detection of 8-oxoG site in single-stranded DNA at the single-molecule level, particularly suitable for high-throughput screening of a massive number of samples.