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Related Experiment Video

Updated: Nov 30, 2025

Development of a Quantitative Recombinase Polymerase Amplification Assay with an Internal Positive Control
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Solvent engineering studies on recombinase polymerase amplification.

Kenji Kojima1, Kevin Maafu Juma1, Shihomi Akagi1

  • 1Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan.

Journal of Bioscience and Bioengineering
|November 12, 2020
PubMed
Summary

Recombinase polymerase amplification (RPA) offers a rapid, constant-temperature method for nucleic acid amplification. Optimized conditions enhance RPA efficiency, making it ideal for point-of-care pathogen detection.

Keywords:
Reaction conditionRecombinaseRecombinase polymerase amplificationSingle strand DNA-binding proteinSolvent engineering

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Biochemistry

Background:

  • Recombinase polymerase amplification (RPA) enables specific nucleic acid sequence amplification at a constant temperature.
  • Unlike polymerase chain reaction (PCR), RPA's isothermal nature is advantageous for field applications.
  • RPA holds potential for onsite pathogen detection when integrated with nucleic acid extraction and detection methods.

Purpose of the Study:

  • To optimize reaction conditions for enhanced Recombinase polymerase amplification (RPA) efficiency.
  • To investigate the impact of various additives on RPA performance.
  • To assess the suitability of RPA for point-of-care diagnostic applications.

Main Methods:

  • Preparation of recombinant T4 phage recombinase and single-stranded DNA-binding protein.
  • Systematic examination of reaction parameters including pH, potassium acetate concentration, and temperature.
  • Evaluation of the inhibitory effects of dimethyl sulfoxide and formamide on RPA.

Main Results:

  • Optimal RPA performance was observed at pH 7.5-8.0 and potassium acetate concentrations of 40-80 mM.
  • The optimal reaction temperature range for RPA was determined to be 37-45°C.
  • Dimethyl sulfoxide and formamide at 5% v/v were found to inhibit the RPA reaction.

Conclusions:

  • RPA can be performed under a broader range of optimal conditions compared to PCR.
  • Optimized RPA is a robust technique highly suitable for point-of-care diagnostic applications.
  • Further development of RPA protocols can facilitate rapid onsite pathogen identification.