Recombinase polymerase amplification: transforming rapid detection of infectious diseases

Pathogens are the agents responsible for these infections, and they use various mechanisms to invade and evade host defenses, emphasizing the importance of early detection. Molecular techniques such as polymerase chain reaction (PCR) have become the gold standard for detecting viral and bacterial pathogens due to their high sensitivity, specificity, and well-established validation. However, PCR requires thermal cycling equipment, a stable power supply, and trained personnel, which may limit its accessibility in resource-constrained settings. Isothermal amplification techniques are promising alternatives to PCR by providing simplicity, speed, and portability. Among these, recombinase polymerase amplification is particularly notable for its versatility, rapidity, and efficiency in amplifying nucleic acids at constant temperatures. This review discusses pathogen invasion mechanisms and recent advances in molecular diagnostics, with particular emphasis on RPA. The principles of RPA are compared with PCR, highlighting key advantages such as rapid amplification (typically within 20 min), low-temperature operation, minimal instrumentation, and compatibility with point-of-care (POC) platforms. At the same time, limitations of RPA, including primer design complexity, potential non-specific amplification, and current cost considerations, are addressed. RPA represents a versatile and promising tool that complements existing molecular methods and holds significant potential for expanding early infectious disease detection, particularly in decentralized and low-resource environments. By enabling timely and accessible diagnostics, RPA contributes substantially to improved disease surveillance, control, and patient outcomes.

Traditional detection methodologies, such as culturing, PCR, and isothermal amplification techniques, with a focus on RPA. Due to its simple procedure, short detection time, high sensitivity and specificity, and suitability for point-of-care testing in remote areas, RPA can be the best alternative for the detection of infectious diseases.