title: Label free electrochemical DNA hybridization discrimination effects at the binary and ternary mixed monolayers of single stranded DNA/diluent/s in presence of cationic intercalators.
abstract: Electrochemical label free DNA hybridization discrimination of the brain tumor sequence CK20 has been made at the gold-thiol and thiol diluent binary and ternary mixed monolayer interfaces in presence of the [Fe(CN)6](3-) and double stranded DNA (dsDNA) specific cationic intercalators, proflavine (PF) and methylene blue (MB), respectively. Thiol hexane labeled single stranded DNA (HS-ssDNA) and thiol diluents such as 6-mercapto-1-hexanol (MCH) and 3-mercaptopropionic acid (MPA) are used to construct the mixed monolayers. Change in the peak-to-peak separation (Delta Ep) for the [Fe(CN)6](3-) redox reaction indicates the efficiency of the diluents in removing the randomly oriented HS-ssDNA. Smaller Delta Ep 248 mV noticed for the HS-ssDNA/MPA compared to the HS-ssDNA/MCH mixed monolayers (812 mV) indicates the less influence of the MCH diluent on the arrangement of HS-ssDNA layer. However, the hybridization discrimination effect negotiated in presence of both the [Fe(CN)6](3-) and PF intercalator showed zero effect for the HS-ssDNA/MPA interface, and approximately 20-30% effect for the HS-ssDNA/MCH interface. The discrimination effect at the HS-ssDNA/MPA interface further increased to 80% by inserting the MCH at the local defects to form a multicomponent ternary HS-ssDNA/MPA/MCH layer interface. These differential discrimination effects are attributed to the formation of compact and/or defective layer structures, evidenced from their reductive desorption voltammetry in 0.5M KOH. The presence of single base (C-A) mismatch in the hybrid is diagnosed by a decrease in coulometric charge compared to the perfect dsDNA. The target concentration of 10 pM is detected selectively and sensitively.
authors.affiliation: Department of Chemistry, BK School of Molecular Science, Pohang University of Science and Technology, San 31 Hyoja Dong, Pohang 790-784, South Korea.
authors.forename: V
authors.initials: V
authors.lastname: Dharuman
authors.forename: Jong Hoon
authors.initials: JH
authors.lastname: Hahn
mesh_terms: D001483:Base Sequence; D015374:Biosensing Techniques / Q000379:methods*; D001932:Brain Neoplasms / Q000235:genetics*; D002412:Cations; D004273:DNA, Neoplasm / Q000235:genetics*; D004563:Electrochemistry / Q000379:methods*; D006801:Humans; D017403:In Situ Hybridization / Q000379:methods*; D007364:Intercalating Agents; D008969:Molecular Sequence Data; D017422:Sequence Analysis, DNA / Q000379:methods*; D013194:Staining and Labeling
chemical_list: D002412:Cations; D004273:DNA, Neoplasm; D007364:Intercalating Agents