A method determining the presence or absence of a single nucleotide polymorphism at a SNP site in a nucleic acid target. Capture probes are designed, each of which has a different SNP base and a sequence of probe bases on each side of the SNP base. The probe bases are complementary to the corresponding target sequence adjacent to the SNP site. Each capture probe is immobilized on a different electrode having a non-conductive outer layer on a conductive working surface of a substrate. The extent of hybridization between each capture probe and the nucleic acid target is detected by detecting the oxidation-reduction reaction at each electrode, utilizing a transition metal complex. These differences in the oxidation rates at the different electrodes are used to determine whether the selected nucleic acid target has a single nucleotide polymorphism at the selected SNP site.
一种确定核酸靶标中 SNP 位点是否存在单核苷酸多态性的方法。设计的捕获探针每个都有一个不同的 SNP 碱基和 SNP 碱基两侧的探针碱基序列。探针碱基与 SNP 位点附近的相应靶序列互补。每个捕获探针都固定在不同的电极上,该电极有一个非导电外层,位于基底的导电工作面上。每个捕获探针与核酸靶之间的杂交程度是通过检测每个电极上的氧化还原反应来检测的,使用的是过渡
金属复合物。不同电极上氧化率的差异可用于确定所选核酸靶是否在所选 SNP 位点存在单核苷酸多态性。