DNA Detection Using Recombination Proteins

TLDR

DNA amplification is essential for nucleic acid testing, yet conventional methods require sophisticated equipment or complex procedures that limit their use outside specialized laboratories. Recombinase polymerase amplification (RPA) achieves isothermal, primer‑guided amplification by combining recombinase‑driven primer targeting with strand‑displacement DNA synthesis, and a probe‑based detection system enables instrument‑free, sandwich‑assay readout, as demonstrated with a methicillin‑resistant Staphylococcus aureus test. RPA delivers exponential amplification without sample pretreatment, operates rapidly at low temperature, detects fewer than ten genomic DNA copies, and its products are identifiable in a simple sandwich assay, marking a significant advance toward portable nucleic acid diagnostics.

Abstract

DNA amplification is essential to most nucleic acid testing strategies, but established techniques require sophisticated equipment or complex experimental procedures, and their uptake outside specialised laboratories has been limited. Our novel approach, recombinase polymerase amplification (RPA), couples isothermal recombinase-driven primer targeting of template material with strand-displacement DNA synthesis. It achieves exponential amplification with no need for pretreatment of sample DNA. Reactions are sensitive, specific, and rapid and operate at constant low temperature. We have also developed a probe-based detection system. Key aspects of the combined RPA amplification/detection process are illustrated by a test for the pathogen methicillin-resistant Staphylococcus aureus. The technology proves to be sensitive to fewer than ten copies of genomic DNA. Furthermore, products can be detected in a simple sandwich assay, thereby establishing an instrument-free DNA testing system. This unique combination of properties is a significant advance in the development of portable and widely accessible nucleic acid-based tests.