Morpholino-functionalized nanochannel array for label-free single nucleotide polymorphisms detection

Analytical Chemistry
Hong-Li GaoXing-Hua Xia

Abstract

The sensitive identification of single nucleotide polymorphisms becomes increasingly important for disease diagnosis, prevention, and practical applicability of pharmacogenomics. Herein, we propose a simple, highly selective, label-free single nucleotide polymorphisms (SNPs) sensing device by electrochemically monitoring the diffusion flux of ferricyanide probe across probe DNA/morpholino duplex functionalized nanochannels of porous anodic alumina. When perfectly matched or mismatched target DNA flows through the nanochannels modified with probe DNA/morpholino duplex, it competes for the probe DNA from morpholino, resulting in a change of the surface charges. Thus, the diffusion flux of negatively charged electroactive probe ferricyanide is modulated since it is sensitive to the surface charge due to the electrostatic interactions in electric double layer-merged nanochannels. Monitoring of the change in diffusion flux of probe enables us to detect not only a single base or two base mismatched sequence but also the specific location of the mismatched base. As is demonstrated, SNPs in the PML/RARα fusion gene, known as a biomarker of acute promyelocytic leukemia (APL), have been successfully detected.

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Citations

Aug 28, 2015·ACS Applied Materials & Interfaces·Mubarak AliWolfgang Ensinger
Apr 22, 2017·Analytical Chemistry·Tangbin LiaoGuo-Jun Zhang
Jul 29, 2017·ACS Sensors·Sade RuffinRastislav Levicky
Jan 15, 2016·Advanced Materials·Pengcheng GaoFan Xia
Sep 6, 2018·Chemical Communications : Chem Comm·Liu ShiGenxi Li
Dec 6, 2017·Advanced Healthcare Materials·Gayathri RajeevNicolas H Voelcker
Aug 22, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Xinchun LiFan Xia

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