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Ligation-assisted target recycling for DNA nanoswitch biosensors

Morya, V.; Hayden, A.; Zeghal, M.; Abraham Punooose, J.; Halvorsen, K.

2026-05-20 biochemistry
10.64898/2026.05.15.725157 bioRxiv
Show abstract

Conformationally responsive DNA nanoswitches have previously been developed and validated for a variety of biosensing applications including detection of DNA, microRNA, and viral RNA/DNA. Here we develop new methodology for enhancing the sensitivity of DNA-based sensing by recycling a fixed number of targets for repeated reuse. We achieved target-dependent enzymatic ligation of looped nanoswitches and showed that subsequent removal of target does not affect the ligated loop. Through cyclic annealing, ligation, and target removal, we can linearly control signal amplification up to hundreds of cycles. This method adds an important new capability for low abundance targets without the need for target amplification.

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