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. 1996 Jan 15;24(2):348–353. doi: 10.1093/nar/24.2.348

DNA detection by strand displacement amplification and fluorescence polarization with signal enhancement using a DNA binding protein.

G T Walker 1, C P Linn 1, J G Nadeau 1
PMCID: PMC145624  PMID: 8628661

Abstract

Strand displacement amplification (9SDA) is an isothermal in vitro method of amplifying a DNA sequence prior to its detection. We have combined SDA with fluorescence polarization detection. A 5'-fluorescein-labelled oligodeoxynucleotide detector probe hybridizes to the amplification product that rises in concentration during SDA and the single- to double strand conversion is monitored through an increase in fluorescence polarization. Detection sensitivity can be enhanced by using a detector probe containing an EcoRI recognition sequence at its 5'-end that is not homologous to the target sequence. During SDA the probe is converted to a fully double-stranded form that specifically binds a genetically modified form of the endonuclease EcoRI which lacks cleavage activity but retains binding specificity. We have applied this SDA detection system to a target sequence specific for Mycobacterium tuberculosis.

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Selected References

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