Construction of an electrochemical DNA chip for simultaneous genotyping of single nucleotide polymorphisms

An electrochemical DNA chip was constructed for simultaneous genotyping of single nucleotide polymorphisms (SNPs) using genomic DNA extracted from blood samples. This chip consisted of electrodes located on a single piece of substrate and allele-specific oligonucleotide probes on the electrodes. As...

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Bibliographic Details
Published in:Analyst (London) 2005-01, Vol.130 (5), p.687-693
Main Authors: TAKAHASHI, Masayoshi, OKADA, Jun, ITO, Keiko, HASHIMOTO, Michie, HASHIMOTO, Koji, YOSHIDA, Yuri, FURUICHI, Yasuhiro, OHTA, Yasuhiko, MISHIRO, Sunji, GEMMA, Nobuhiro
Format: Article
Language:English
Subjects:
Analytical chemistry
Bisbenzimidazole
Chemistry
DNA - blood
Electrochemical methods
Electrochemistry - methods
Electrodes
Exact sciences and technology
Genotype
Humans
Oligonucleotide Array Sequence Analysis - methods
Oligonucleotide Probes
Polymorphism, Single Nucleotide - genetics
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Summary:An electrochemical DNA chip was constructed for simultaneous genotyping of single nucleotide polymorphisms (SNPs) using genomic DNA extracted from blood samples. This chip consisted of electrodes located on a single piece of substrate and allele-specific oligonucleotide probes on the electrodes. As a first application, the 4 SNPs (MxA[-88], MxA[-123], MBL[X/Y], and MBL[A/B]), which have association with the efficacy of interferon therapy for HCV patient, were genotyped on the new DNA chip. Following hybridization of PCR products containing the 4 types of fragments, washing, bisbenzimide H33258 (Hoechst 33258) reaction and electrochemical analyses, 59 blood samples were genotyped by the chip method simultaneously. All procedures were completed within 2 h and the results were 100% concordant with those by the direct sequence method. The electrochemical DNA chip is expected to be a practical tool for SNPs genotyping.
ISSN:0003-2654
1364-5528
DOI:10.1039/b414030n