Nature Biotechnology
23, 885 - 889 (2005)
Published online: 12 June 2005; | doi:10.1038/nbt1106
Multiplexed detection of pathogen DNA with DNA-based fluorescence nanobarcodesYougen Li, Yen Thi Hong Cu
& Dan Luo
Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853-5701, USA
Correspondence should be addressed to Dan Luo DL79@cornell.eduRapid, multiplexed, sensitive and specific molecular detection is of great demand in gene profiling, drug screening, clinical diagnostics and environmental analysis1,
2,
3. One of the major challenges in multiplexed analysis is to identify each specific reaction with a distinct label or 'code'4. Two encoding strategies are currently used: positional encoding, in which every potential reaction is preassigned a particular position on a solid-phase support such as a DNA microarray5,
6,
7,
8, and reaction encoding, where every possible reaction is uniquely tagged with a code that is most often optical or particle based4,
9,
10,
11,
12,
13. The micrometer size, polydispersity, complex fabrication process and nonbiocompatibility of current codes limit their usability1,
4,
12. Here we demonstrate the synthesis of dendrimer-like DNA-based, fluorescence-intensity-coded nanobarcodes, which contain a built-in code and a probe for molecular recognition. Their application to multiplexed detection of the DNA of several pathogens is first shown using fluorescence microscopy and dot blotting, and further demonstrated using flow cytometry that resulted in detection that was sensitive (attomole) and rapid.
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