Programming the Dynamic Range of Nanochannel Biosensors for MicroRNA Detection Through Allosteric DNA Probes.

Angew Chem Int Ed Engl

State Key Laboratory of Biogeology and Environmental Geology, Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, China.

Published: November 2024

AI Article Synopsis

  • Solid-state nanochannel biosensors are effective for detecting microRNA due to their sensitivity but have limited dynamic ranges that affect their performance.
  • The authors propose using tunable triblock DNA probes to enhance these biosensors, allowing for customizable adjustments to their dynamic range and improving their binding affinities for target miRNA.
  • By utilizing these advanced probes, the biosensors achieve an impressive dynamic range increase, from an initial 81-fold to 10,900-fold, which greatly expands their potential for use in various biomedical and clinical applications.

Article Abstract

Solid-state nanochannel biosensors are extensively utilized for microRNA (miRNA) detection owing to their high sensitivity and rapid response. However, conventional nanochannel biosensors face limitations in their fixed dynamic range, restricting their versatility and efficacy. Herein, we introduce tunable triblock DNA probes with varying affinities for target miRNA to engineer solid-state nanochannel biosensors capable of customizable dynamic range adjustment. The triblock DNA architecture comprises a poly-adenine (polyA) block for adjustable surface density anchoring, alongside stem and loop blocks for modulating structural stability. Through systematic manipulation of these blocks, we demonstrate the ability to achieve diverse target binding affinities and detection limits, achieving an initial 81-fold dynamic range. By combining probes with various affinities, we extend this dynamic range significantly to 10,900-fold. Furthermore, by implementing a sequestration mechanism, the effective dynamic range of the nanochannel biosensor is narrowed to only a 3-fold span of target concentrations. The customizable dynamic range of these advanced nanochannel biosensors makes them highly promising for a broad spectrum of biomedical and clinical applications.

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Source
http://dx.doi.org/10.1002/anie.202417280DOI Listing

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