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Upstream processing represents a critical phase in biomanufacturing, wherein biological systems such as microorganisms, mammalian cells, or insect cells are cultivated to produce therapeutic proteins, vaccines, enzymes, or other biologically derived products. This phase encompasses all steps from the selection and genetic manipulation of the production organism to the cultivation of cells in bioreactors under tightly controlled environmental conditions.Host Selection and Genetic OptimizationThe...
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Production, Purification, and Quality Control for Adeno-associated Virus-based Vectors
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Improving AAV Production Yield and Quality for Different Serotypes Using Distinct Processing Methods.

Ashish Khaparde1, Riya Patra1,2, Shomereeta Roy1

  • 1GROW Research Laboratory, Narayana Nethralaya Foundation, Bangalore 560099, India.

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|June 16, 2025
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Summary
This summary is machine-generated.

Maximizing adeno-associated virus (AAV) yields is crucial for gene therapy accessibility. This study optimized AAV purification, showing affinity chromatography significantly improves recovery and quality for AAV production.

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Area of Science:

  • Gene Therapy
  • Biotechnology
  • Viral Vector Production

Background:

  • Adeno-associated viruses (AAVs) are key gene therapy vectors with potential limited by production yields.
  • Current lab-scale AAV yields range from 10^12-10^14 vgc/L, impacting cost and accessibility.
  • Optimizing upstream and downstream processes is essential for increasing AAV production efficiency.

Purpose of the Study:

  • To compare two purification methods (CsCl ultracentrifugation and affinity column chromatography) for adeno-associated virus (AAV) recovery.
  • To optimize AAV yields and assess the impact on product quality and transduction efficiency.
  • To enhance the overall production capacity and reduce the cost of AAV-based gene therapies.

Main Methods:

  • Utilized an adherent cell manufacturing process for AAV production.
  • Compared purification of AAV from cell lysate (CsCl ultracentrifugation) and media supernatant (affinity chromatography).
  • Quantified purified AAV yields for serotypes AAV6, AAV8, and AAV9 using both methods.

Main Results:

  • Achieved combined yields of 2.25 × 10^13 (AAV6), 1.11 × 10^14 (AAV8), and 7.32 × 10^13 (AAV9) vg/L.
  • Affinity chromatography yielded higher percentage recoveries (AAV6: 88.35%, AAV8: 96.67%, AAV9: 93.54%) from media supernatant.
  • AAV9 production showed a ~1.5-fold increase compared to previous reports; chromatography also improved transduction rates.

Conclusions:

  • Affinity chromatography is a superior method for AAV purification, offering higher recovery and improved product quality.
  • Optimized purification strategies demonstrate potential for significantly expanding AAV production capacity.
  • Further research into serotype-specific elution pH can further refine AAV purification processes.