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Science 8 September 2000:
Vol. 289. no. 5485, pp. 1757 - 1760
DOI: 10.1126/science.289.5485.1757
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Reports

Scanometric DNA Array Detection with Nanoparticle Probes

T. Andrew Taton,12 Chad A. Mirkin,12* Robert L. Letsinger1*

A method for analyzing combinatorial DNA arrays using oligonucleotide-modified gold nanoparticle probes and a conventional flatbed scanner is described here. Labeling oligonucleotide targets with nanoparticle rather than fluorophore probes substantially alters the melting profiles of the targets from an array substrate. This difference permits the discrimination of an oligonucleotide sequence from targets with single nucleotide mismatches with a selectivity that is over three times that observed for fluorophore-labeled targets. In addition, when coupled with a signal amplification method based on nanoparticle-promoted reduction of silver(I), the sensitivity of this scanometric array detection system exceeds that of the analogous fluorophore system by two orders of magnitude.

1 Department of Chemistry,
2 Center for Nanofabrication and Molecular Self-Assembly, Northwestern University, Evanston, IL 60208, USA.
*   To whom correspondence should be addressed. E-mail: camirkin{at}chem.northwestern.edu (C.A.M.); r-letsinger{at}chem.northwestern.edu (R.L.L.)

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