Advanced AAV Generation Platforms
Applied Viromics has established two distinct production pipelines to package recombinant Adeno-Associated Virus (AAV) based on your target scale, budget, and application constraints.
HEK293 Triple Transfection
- Titer Range: 2E11 to 1E14 GC total
- Timeline: Less than 2 weeks (Fast-track)
- Contamination: Helper-virus free system
- Best For: In vitro screening, early in vivo research, and rapid testing
Sf9 / Baculovirus System
- Titer Range: Up to 1E16 GC total
- Concentration: Up to 1E14 GC/mL
- Timeline: 4 to 6 weeks
- Best For: High-yield bioreactor scale-ups, animal studies, and pre-clinical trials
Both host platforms produce AAV vectors with similar infectivity. However, host cell protein (HCP) impurities differ due to human vs. insect origins. Applied Viromics monitors HCP levels to aid serotype-specific selections.
1. Triple Transfection Protocol (HEK293 Cells)
This is the industry standard for fast, high-titer vector production. By introducing three separate plasmids, we completely bypass helper virus requirements, resulting in rapid expression and zero adenovirus contamination.
Subcloning & Amplification
Your Gene of Interest (GOI) is subcloned into our pAAV shuttle plasmid. The plasmid is amplified under endotoxin-free conditions to prepare for transfection.
Triple Transfection
HEK293 cells are co-transfected with: (1) pAAV containing GOI, (2) pRepCap (encoding serotype-specific Rep and Cap proteins), and (3) pHELP (helper plasmid providing adenovirus E2A, E4, and VA RNA genes).
CsCl Purification & Buffer Exchange
Cells are harvested, lysed, and AAV particles are purified using double Cesium Chloride (CsCl) density gradient ultracentrifugation. Purified particles are desalted and dialyzed into your preferred storage buffer.
2. Baculovirus Expression Protocol (Sf9 Insect Cells)
Ideal for bioreactor-scale scaling. High cell density growth of Sf9 cells paired with baculoviral infection yields very high concentration vector preps.
Baculovirus Recombination
We subclone your GOI into a pFastBac shuttle vector and perform site-specific transposition into a bacmid within E. coli cells.
Helper Baculovirus Generation
Sf9 insect cells are transfected with recombinant bacmid DNA to yield high-titer helper baculovirus carrying the AAV genome.
Bioreactor Production & Purification
Sf9 cells are co-infected with recombinant baculoviruses containing the AAV genome and capsid functions. AAV is extracted, CsCl density purified, and analyzed.
Packaging Limit
The standard single-stranded AAV packaging limit is approximately 4.7 kb (from ITR to ITR). Exceeding this size reduces packaging efficiency and results in truncated genomes. For self-complementary (scAAV), the limit is ~2.3 kb.
AAV Storage
AAV vectors are highly stable but should be aliquoted in single-use tubes upon receipt and stored at -80°C to prevent activity loss from freeze-thaw cycles.
NIH Guidelines Biosafety Level 1 (BSL-1)
Recombinant AAV vectors lacking functional oncogenes or toxins are classified as BSL-1 agents under NIH Guidelines. They present low hazard risk and can be handled in basic laboratory settings.