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Related Experiment Video

Updated: Jan 10, 2026

Production of Double-stranded DNA Ministrings
06:12

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Published on: February 29, 2016

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Buffer Valency Engineering Enables High-concentration and Shelf-stable DNA Transfection Particles for Viral Vector

Hai-Quan Mao1,2,3, Jinghan Lin1,2,4,5, Yizong Hu2

  • 1Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD, USA.

Research Square
|November 24, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed stable, concentrated plasmid DNA/poly(ethylenimine) transfection particles for adeno-associated virus (AAV) gene therapy production. This method enhances scalability and cost-effectiveness by improving particle stability and concentration.

Keywords:
Adeno-associated virusKinetic controlled assemblyPlasmid DNAPoly(ethylenimine)Scalable manufacturingShelf-stable transfection particlesViral vector production

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Area of Science:

  • Biotechnology
  • Gene Therapy Manufacturing
  • Nanoparticle Engineering

Background:

  • Adeno-associated virus (AAV)-mediated gene therapy requires cost-effective and scalable production methods.
  • Current transient transfection methods for AAV production face challenges with particle instability and concentration limits, hindering reproducibility and scalability.

Purpose of the Study:

  • To develop a streamlined, scalable strategy for producing shelf-stable, highly concentrated plasmid DNA (pDNA)/poly(ethylenimine) (PEI) transfection particles.
  • To improve the efficiency and robustness of AAV manufacturing processes.

Main Methods:

  • Incorporation of trivalent citrate ions into dilution buffers to kinetically modulate electrostatic complexation.
  • Achieving uniform nanoparticle assembly and preventing aggregation at high concentrations.
  • Utilizing a robust particle assembly process compatible with standard workflows and scalable mixing conditions.

Main Results:

  • Generated shelf-stable, highly concentrated pDNA/PEI transfection particles (200 μg/mL, a tenfold increase).
  • Reduced the required dosing volume of transfection particles to 0.5% of cell culture medium.
  • Demonstrated equivalent AAV production efficiencies compared to standard methods across various production scales.

Conclusions:

  • The developed method offers a robust, scalable, and cost-effective approach for AAV manufacturing.
  • The citrate ion-mediated strategy overcomes limitations of traditional transfection particle preparation.
  • This advancement facilitates the clinical translation of AAV-mediated gene therapies.