AI Insight
Researchers developed a signal amplification method for DNA nanoswitch biosensors that recycles a limited number of target molecules through repeated cycles of annealing, enzymatic ligation, and target removal. The approach uses target-dependent ligation to lock nanoswitches into a looped conformation, and because the ligated state persists after target removal, the same target molecules can be reused across multiple cycles. This enables linear control of signal amplification over hundreds of cycles without requiring direct amplification of the target itself.
Why it matters
This method could improve the detection of low-abundance biomolecules such as microRNA or viral genetic material, which is relevant for early disease diagnosis and clinical diagnostics where sample quantities are often limited.
⚠️ Preprint – Noch nicht peer-reviewed
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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.
Source: Ligation-assisted target recycling for DNA nanoswitch biosensors