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Rapid and Specific Detection of Acinetobacter baumannii Infections Using a Recombinase Polymerase Amplification/Cas12a-based System
Published on: April 25, 2025
[Recombinase Polymerase Amplification for Rapid Detection of Human Bacterial Pneumonia Pathogens]
S A Lapa1,2, S A Surzhikov1, S A Blagodatskikh3
1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia.
Abstract:
A diagnostic system based on recombinase polymerase amplification (RPA) has been developed to identify six bacterial pathogens of human pneumonia. Species-specific primers have been designed and optimized to conduct a multiplex reaction in one common volume. Labeled primers were used for reliable discrimination of amplification products that are similar in size. Identification of the pathogen was carried out by visual analysis of an electrophoregram. The analytical sensitivity of the developed multiplex RPA was 10^(2)-10^(3) copies of DNA. The specificity of the system was determined by the absence of cross-amplification of the studied DNA samples of pneumonia pathogens for each pair of primers, as well as for the DNA of Mycobacterium tuberculosis H37rv, and amounted to 100%. The execution time of the analysis is less than an 1 h, including the electrophoretic reaction control. The test system can be used in specialized clinical laboratories for rapid analysis of samples from patients with suspected pneumonia.
Insights
A new diagnostic system uses recombinase polymerase amplification (RPA) to rapidly identify six bacterial pneumonia pathogens. This multiplex assay offers high sensitivity and specificity in under an hour for clinical use.
Area of Science:
- Molecular diagnostics
- Microbiology
- Biotechnology
Context:
- Bacterial pneumonia poses a significant global health threat, necessitating rapid and accurate diagnostic tools.
- Current diagnostic methods can be time-consuming, delaying appropriate patient treatment.
- The need for a sensitive and specific test to identify common bacterial pneumonia pathogens is critical.
Purpose:
- To develop and validate a multiplex recombinase polymerase amplification (RPA) assay for the simultaneous detection of six key bacterial pneumonia pathogens.
- To optimize species-specific primers and labeled probes for reliable identification of amplification products.
- To establish the analytical sensitivity, specificity, and turnaround time of the developed diagnostic system.
Summary:
- A novel multiplex RPA assay was designed using species-specific primers to detect six bacterial pneumonia pathogens in a single reaction.
- Labeled primers facilitated discrimination of similar-sized amplification products, with identification confirmed via electrophoregram analysis.
- The assay demonstrated high analytical sensitivity (10^2–10^3 DNA copies) and 100% specificity, including against Mycobacterium tuberculosis.
- Complete analysis, including electrophoretic control, was achieved in under one hour.
Impact:
- Provides a rapid, sensitive, and specific diagnostic solution for bacterial pneumonia.
- Enables faster clinical decision-making and targeted antimicrobial therapy.
- Facilitates use in specialized clinical laboratories for timely patient sample analysis.
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