Tuning the Topological Landscape of DNA-Cyclodextrin Nanocomplexes by Molecular Design

Area of Science:

• Biomaterials Science
• Nanotechnology
• Gene Delivery Systems

Background:

• Developing effective nonviral gene delivery vectors is crucial for advancing gene therapy.
• Plasmid DNA (pDNA) is a common genetic material for gene therapy, but its efficient delivery remains a challenge.
• Controlling the morphology of pDNA condensates influences their biological performance.

Purpose of the Study:

• To design and synthesize novel molecular vectors for tunable plasmid DNA (pDNA) condensates.
• To investigate the relationship between vector structure, condensate morphology, and in vitro transfection efficiency.
• To explore the pH-responsive characteristics of the developed gene delivery systems.

Main Methods:

• Synthesis of cyclodextrin-based molecular vectors with specific topological features.
• Nanoscale characterization of pDNA condensates formed with the novel vectors, revealing diverse morphologies (rods, worms, toroids, globules, ellipsoids, spheroids).
• In vitro transfection assays to evaluate the efficiency of different condensate shapes.
• Computational studies to understand the stability and self-assembly mechanisms of the supramolecular edifices.

Main Results:

• Molecular vectors enabled precise control over pDNA condensate shape and surface properties.
• A variety of nanoscale morphologies were achieved by subtle molecular design modifications.
• Ellipsoidal and spherical pDNA condensates with lamellar internal structures exhibited remarkably high transfection efficiencies.
• pH responsiveness was observed, facilitating endosomal escape and DNA release.

Conclusions:

• The developed molecular vectors offer a versatile platform for creating monodisperse, synthetic nonviral gene delivery systems.
• Nanocomplex morphology is a critical determinant of transfection efficiency.
• The pH-responsive nature of the vectors enhances their potential for effective gene delivery applications.