MUltiplexed
detection of pathogen DNA with DNA-based fluorescence nanobarcodes
Nature Biotechnology 23, Pg. 885-889
(2005)
from Nature Biotechnology "In this Issue"
Pathogen barcoding branches out
" Luo and colleagues have developed
a fluorescence nanobarcode-based DNA detection method to analyze
samples containing pathogenic microorganisms such as the anthrax
bacterium, Ebola virus or the severe acute respiratory syndrome
(SARS) virus. The approach consists of fabricating Y-shaped,
dendrimer- like DNA scaffolds that can form highly branched
structures. Subsequently, the authors attached a pathogen-specific
probe to one arm of the structure and green and red fluorescent
particles in predetermined ratios (e.g., 1:1, 1:3, 4:1 or
3:2) to the other arms of the structure, effectively creating
a specific ‘barcode’ for each target that could be identified
based on fluorescence color (different mixes of red and green)
and intensity (depending on the number of fluorescent tags
used to create the independent barcodes). These fluorescent
nanobarcodes were then applied to detect DNA from several
pathogens at very low concentrations (attomole) using conventional
fluorescence detection devices, such as fluorescence microscopy,
dot blots and flow cytometry. This technological platform
has the potential of being applied to the detection of many
different types of DNA targets in complex biological samples.
[Letters, p. 885] GTO" Download
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