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Nucleic Acids Research, Vol 27, Issue 24 4830-4837, Copyright © 1999 by Oxford University Press

ARTICLES

Single-base mismatch detection based on charge transduction through DNA

SO Kelley, EM Boon, JK Barton, NM Jackson and MG Hill
Division of Chemistry, California Institute of Technology, Pasadena, CA 91125, USA.

High-throughput DNA sensors capable of detecting single-base mismatches are required for the routine screening of genetic mutations and disease. A new strategy for the electrochemical detection of single- base mismatches in DNA has been developed based upon charge transport through DNA films. Double-helical DNA films on gold surfaces have been prepared and used to detect DNA mismatches electrochemically. The signals obtained from redox-active intercalators bound to DNA-modified gold surfaces display a marked sensitivity to the presence of base mismatches within the immobilized duplexes. Differential mismatch detection was accomplished irrespective of DNA sequence composition and mismatch identity. Single-base changes in sequences hybridized at the electrode surface are also detected accurately. Coupling the redox reactions of intercalated species to electrocatalytic processes in solution considerably increases the sensitivity of this assay. Reporting on the electronic structure of DNA, as opposed to the hybridization energetics of single-stranded oligonucleotides, electrochemical sensors based on charge transport may offer fundamental advantages in both scope and sensitivity.
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