Journal
NATURE NANOTECHNOLOGY
Volume 5, Issue 12, Pages 868-873Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2010.213
Keywords
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Funding
- National Human Genome Research Institute [HG004378]
- National Cancer Institute [U54CA143682]
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It has been proposed that single molecules of DNA could be sequenced by measuring the physical properties of the bases as they pass through a nanopore(1,2). Theoretical calculations suggest that electron tunnelling can identify bases in single-stranded DNA without enzymatic processing(3-5), and it was recently experimentally shown that tunnelling can sense individual nucleotides(6) and nucleosides(7). Here, we report that tunnelling electrodes functionalized with recognition reagents can identify a single base flanked by other bases in short DNA oligomers. The residence time of a single base in a recognition junction is on the order of a second, but pulling the DNA through the junction with a force of tens of piconewtons would yield reading speeds of tens of bases per second.
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