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Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
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DNA Origami-Mediated Substrate Nanopatterning of Inorganic Structures for Sensing Applications
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Functional DNA nanostructures for theranostic applications.

Hao Pei1, Xiaolei Zuo, Dan Zhu

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DNA nanostructures offer advanced biosensing and theranostic applications. These self-assembled DNA nanoobjects enable precise molecular recognition and drug delivery, showing promise for intelligent nanodevices.

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Area of Science:

  • * Nanotechnology
  • * Molecular Biology
  • * Biomedical Engineering

Background:

  • * DNA self-assembly enables the creation of complex, well-defined nanostructures.
  • * DNA nanostructures are increasingly explored for biomedical applications, particularly in diagnosis and therapy (theranostics).
  • * Challenges in biosensor design include limited target accessibility at solid-water interfaces.

Purpose of the Study:

  • * To leverage DNA nanotechnology for enhanced biosensing capabilities.
  • * To develop DNA nanostructures for intracellular sensing and imaging.
  • * To explore DNA nanostructures as biocompatible drug delivery vehicles for theranostic applications.

Main Methods:

  • * Self-assembly of thiol-modified tetrahedral DNA nanostructures onto gold surfaces.
  • * Anchoring of various biomolecular probes (DNA, aptamers, peptides, proteins) onto DNA nanostructure scaffolds.
  • * Investigation of cell permeability and intracellular sensing/imaging properties of DNA nanostructures.
  • * Functionalization of DNA nanostructures with oligonucleotide drugs for therapeutic effects.

Main Results:

  • * DNA nanostructure-based biosensors significantly increased target accessibility and sensitivity by several orders of magnitude.
  • * Tetrahedral DNA nanostructures demonstrated cell permeability, enabling intracellular sensing and imaging.
  • * DNA nanostructures exhibited excellent biocompatibility with minimal cytotoxicity, serving as effective drug delivery nanocarriers.
  • * CpG-functionalized DNA tetrahedra showed enhanced immunostimulatory effects, indicating potential as nanomedicine.

Conclusions:

  • * Functionalized DNA nanostructures provide a versatile platform for advanced biosensing with improved sensitivity.
  • * DNA nanostructures can function as dynamic intracellular nanosensors and imaging agents.
  • * These DNA nanostructures hold significant promise as intelligent theranostic nanodevices for simultaneous sensing, diagnosis, and therapy.