Detection of a specific biomarker for Epstein-Barr virus using a polymer-based genosensor.
This paper describes methodology for direct and indirect detections of a specific oligonucleotide for Epstein-Barr virus (EBV) using electrochemical techniques. The sequence of oligonucleotide probe (EBV1) revealed a high sequence identity (100%) with the EBV genome. For the development of the genosensor, EBV1 was grafted to the platform sensitized with poly(4-aminothiophenol). After that, the hybridization reaction was carried out with the complementary target (EBV2) on the modified electrode surface using ethidium bromide as DNA intercalator. The oxidation peak currents of ethidium bromide increased linearly with the values of the concentration of the complementary sequences in the range from 3.78 to 756 µmol·L⁻¹. In nonstringent experimental conditions, this genosensor can detect 17.32 nmol·L⁻¹ (three independent experiments) of oligonucleotide target, discriminating between complementary and non-complementary oligonucleotides, as well as differentiating one-base mismatch, as required for detection of genetic diseases caused by point mutations. The biosensor also displayed high specificity to the EBV target with elimination of interference from mix (alanine, glucose, uric acid, ascorbic acid, bovine serum albumin (BSA), glutamate and glycine) and good stability (120 days). In addition, it was possible to observe differences between hybridized and non-hybridized surfaces through atomic force microscopy.
Institute of Genetics and Biochemistry, Federal University of Uberlândia, Uberlândia 38400-902, Brazil. renataalvesbalvedi@hotmail.com.
Renata P A
RP
Balvedi
Institute of Genetics and Biochemistry, Federal University of Uberlândia, Uberlândia 38400-902, Brazil. tininha112@yahoo.com.br.
Ana C H
AC
Castro
Institute of Chemistry, Federal University of Uberlândia, Uberlândia 38400-902, Brazil. jmadurro@ufu.br.
João M
JM
Madurro
Institute of Genetics and Biochemistry, Federal University of Uberlândia, Uberlândia 38400-902, Brazil. agbrito@iqufu.ufu.br.
Ana G
AG
Brito-Madurro
D000814:Aniline Compounds / Q000737:chemistry; D015415:Biomarkers / Q000032:analysis*; D015374:Biosensing Techniques; D056831:Coordination Complexes / Q000737:chemistry; D004279:DNA, Viral / Q000378:metabolism; D055664:Electrochemical Techniques; D004566:Electrodes; D004996:Ethidium / Q000737:chemistry; D004854:Herpesvirus 4, Human / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D009693:Nucleic Acid Hybridization; D009841:Oligonucleotides / Q000737:chemistry / Q000378:metabolism; D011108:Polymers / Q000737:chemistry*; D013438:Sulfhydryl Compounds / Q000737:chemistry
D000814:Aniline Compounds; D015415:Biomarkers; D056831:Coordination Complexes; D004279:DNA, Viral; D009841:Oligonucleotides; D011108:Polymers; D013438:Sulfhydryl Compounds; C064316:4-aminothiophenol; D004996:Ethidium