Published online 5 August 2005
Methods Online |
Electrochemically directed synthesis of oligonucleotides for DNA microarray fabrication
1Department of Biochemistry, University of Oxford South Parks Road, Oxford OX1 3QU, UK 2Harvard Medical School 260 Longwood Avenue, Boston, MA 02115, USA
*To whom correspondence should be addressed. Tel: +1 857 991 8900; Fax: +1 206 202 4624; Email: ryan{at}egeland.net
Received April 25, 2005. Revised July 13, 2005. Accepted July 13, 2005.
We demonstrate a new method for making oligonucleotide microarrays by synthesis in situ. The method uses conventional DNA synthesis chemistry with an electrochemical deblocking step. Acid is delivered to specific regions on a glass slide, thus allowing nucleotide addition only at chosen sites. The acid is produced by electrochemical oxidation controlled by an array of independent microelectrodes. Deblocking is complete in a few seconds, when competing side-product reactions are minimal. We demonstrate the successful synthesis of 17mers and discrimination of single base pair mismatched hybrids. Features generated in this study are 40 µm wide, with sharply defined edges. The synthetic technique may be applicable to fabrication of other molecular arrays.
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