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 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.
Takahashi
Masayoshi
M
Toshiba Research & Development Center, 1, Komukai Toshiba-cho, Saiwai-ku, Kawasaki, Kanagawa Pref. 212-8582, Japan. masayoshi8.takahashi@toshiba.co.jp
Okada
Jun
J
Ito
Keiko
K
Hashimoto
Michie
M
Hashimoto
Koji
K
Yoshida
Yuri
Y
Furuichi
Yasuhiro
Y
Ohta
Yasuhiko
Y
Mishiro
Sunji
S
Gemma
Nobuhiro
N
D006690:Bisbenzimidazole; D004247:DNA / Q000097:blood*; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D005838:Genotype; D006801:Humans; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D015345:Oligonucleotide Probes; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*
D015345:Oligonucleotide Probes; D004247:DNA; D006690:Bisbenzimidazole