Multifunctional DNA-Metal Nanohybrids Derived From DNA-MgPPi Microhybrids by Rolling Circle Amplification

Area of Science:

• Biotechnology and Nanotechnology
• Materials Science
• Molecular Biology

Background:

• Ultra-long DNA derived from rolling circle amplification (RCA) offers versatile functionalities due to repeated DNA nanostructures.
• Magnesium pyrophosphate (MgPPi) crystals, byproducts of RCA, form microhybrids with DNA, hindering bioapplications due to large size and reduced DNA density.

Purpose of the Study:

• To develop synthesis strategies for condensing DNA-MgPPi microhybrids.
• To replace non-functional MgPPi crystals with functional metal nanostructures.
• To create ultra-long DNA-metal nanohybrids for improved bioapplications.

Main Methods:

• Development of finely tuned synthesis strategies involving condensation and reduction of metal ions.
• Application of the process to DNA templated by microhybrids to reconfigure particle size.
• Systematic exploration of ion concentration and metal ion type effects using morphological, structural, and compositional analyses.

Main Results:

• Successful reconfiguration of organic-inorganic DNA-MgPPi microhybrids into DNA-Au nanohybrids with significantly reduced particle size (approximately 15-fold difference).
• Preservation of gold (Au) nanostructures and DNA nanostructure-driven functions after hybridization.
• Demonstration of near-infrared absorbance and DNA aptamer-mediated targeted intracellular delivery by the nanohybrids.

Conclusions:

• The developed synthesis method effectively creates ultra-long DNA-metal nanohybrids by replacing MgPPi crystals with functional metal nanostructures.
• The resulting nanohybrids combine metal nanoparticle properties with DNA aptamer functionalities for targeted delivery.
• This approach shows significant potential for diverse biological applications requiring advanced DNA-metal nanohybrid materials.