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Isothermal solid-phase amplification system for detection of Yersinia pestis


DNA amplification is required for most molecular diagnostic applications, but conventional polymerase chain reaction (PCR) has disadvantages for field testing. Isothermal amplification techniques are being developed to respond to this problem. One of them is the recombinase polymerase amplification (RPA) that operates at isothermal conditions without sacrificing specificity and sensitivity in easy-to-use formats. In this work, RPA was used for the optical detection of solid-phase amplification of the potential biowarfare agent Yersinia pestis. Thiolated forward primers were immobilized on the surface of maleimide-activated microtitre plates for the quantitative detection of synthetic and genomic DNA, with elongation occurring only in the presence of the specific template DNA and solution phase reverse primers. Quantitative detection was achieved via the use of biotinylated reverse primers and post-amplification addition of streptavidin–HRP conjugate. The overall time of amplification and detection was less than 1 h at a constant temperature of 37 °C. Single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA) sequences were detected, achieving detection limits of 4.04*10−13 and 3.14*10−16 M, respectively. The system demonstrated high specificity with negligible responses to non-specific targets.

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This work has been carried out with partial financial support from the Commission of the European Communities specific RTD programme (FP7-2010-SEC-261810) and the Ministerio de Economia y Competitividad, Ref. BIO2014-56024-C2-1-R. OM thanks the Generalitat de Catalunya for a FI pre-doctoral scholarship.

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Correspondence to Ciara K. O’Sullivan or Ioanis Katakis.

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The authors declare that they have no competing interests.

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Mayboroda, O., Benito, A.G., del Rio, J.S. et al. Isothermal solid-phase amplification system for detection of Yersinia pestis . Anal Bioanal Chem 408, 671–676 (2016).

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  • Recombinase polymerase amplification
  • Yersinia pestis
  • Solid-phase detection