CAS OpenIR  > 中科院上海应用物理研究所2004-2010年
Ligase-based multiple DNA analysis by using an electrochemical sensor array
Wan, Y; Zhang, J; Liu, G; Pan, D; Wang, LH(王丽华); Song, SP(宋世平); Fan, CH(樊春海)
2009
Conference Name10th World Congress on Biosensors
Source PublicationBIOSENSORS & BIOELECTRONICS
Pages1209
Conference DateMAY 14-16, 2008
Conference PlaceShanghai, PEOPLES R CHINA
AbstractWe herein report an electrochemical biosensor for the sequence-specific detection of DNA with high discrimination ability for single-nucleotide polymorphisms (SNPs). This DNA sensor was constructed by a pair of flanking probes that "sandwiched" the target. A 16-electrode electrochemical sensor array was employed, each having one individual DNA capture probe immobilized at gold electrodes via gold-thiol chemistry. By coupling with a biotin-tagged detection probe, we were able to detect multiple DNA targets with a single array. In order to realize SNP detection, a ligase-based approach was employed. In this method, both the capture probe and the detection probe were in tandem upon being hybridized with the target. Importantly, we employed a ligase that specifically could ligate tandem sequences only in the absence of mismatches. As a result, when both probes were complementary to the target, they were ligated in the presence of the ligase, thus being retained at the surface during the subsequent stringent washing steps. In contrast, if there existed 1-base mismatch, which could be efficiently recognized by the ligase, the detection probe was not ligated and subsequently washed away. A conjugate of avidin-horseradish peroxidase was then attached to the biotin label at the end of the detection probe via the biotin-avidin bridge. We then electrochemically interrogated the electrical current for the peroxidase-catalyzed reduction of hydrogen peroxide. We demonstrated that the electrochemical signal for the wild-type DNA was significantly larger than that for the sequence harboring the SNP. (c) 2008 Elsevier B.V. All rights reserved.
ISSN0956-5663
Indexed BySCI
Funding Project应物所课题组
Language英语
Document Type会议论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/8858
Collection中科院上海应用物理研究所2004-2010年
Recommended Citation
GB/T 7714
Wan, Y,Zhang, J,Liu, G,et al. Ligase-based multiple DNA analysis by using an electrochemical sensor array[C],2009:1209.
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