Adeno-Associated Virus (AAV)

Lot Release Testing for
AAV Vector Products

A Comprehensive Testing Panel for Confident Release

Ensuring the safety, quality, and consistency of adeno-associated virus (AAV) vectors is essential for successful clinical and commercial gene therapy programs. A well-defined lot release testing strategy plays a critical role in confirming that each manufactured batch meets established specifications for identity, purity, potency, safety, and regulatory compliance and achieves its critical quality attributes (CQA).

Full Assay Name
BH
DS
DP
Stability
Test Code
Minimum Sample Requirements
TAT (days)
Safety
Isolator Sterility Testing by Direct Inoculation USP<71> (GMP) – (Up to 100mL TA or 20 Vials)
✅
✅
3000004994
Per USP guidelines
21
Bacteriostasis and Fungistasis (Direct Method) (GMP)1
✅
3000004996
Varies depending on fill/volume
21
EP, JP, and USP Mycoplasma Detection (GMP)
✅
3000005147
1x15mL & 1e6 cells/mL
35
EP, JP, and USP Mycoplasma Detection with Mycoplasmastasis (GMP)
✅
3000007121
1x45mL & 1e6 cells/mL
35
Mycoplasma DNA Detection by MycoSEQ Plus using TaqMan Technology – Cell + Suspension (GMP)
✅
3000004752
30mL cell suspension
5
Analysis of Bacterial Endotoxin Contamination Using Endosafe® nexgen-PTS™ (GMP)
✅
3000005222
1mL
7
Analysis of Bacterial Endotoxin Contamination Using the Endosafe® nexgen-PTS™ – Test for Interfering Factors (GMP)
✅
3000005260
1mL
14
Microbiological Examination: Microbial Enumeration Test according to USP<61> (GMP)
✅
3000005066
2x specification
14
Microbiological Examination of Non-sterile products: Microbial Enumeration Test Suitability <61> (GMP)
✅
3000005068
8x routine
21
In Vitro Assay for Adventitious Viral Contaminants: MRC-5, VERO, and HEK Cells (Extended Duration) with Hemadsorption and Hemagglutination Endpoints (GMP)
✅
3000005475
2x6mL at 1e7 cells/mL
35
In Vitro Assay for Adventitious Viral Contaminants – (3 Cell Lines) in Plates – Extended Duration (GMP)
✅
3000004805
2x6mL at 1e7 cells/mL
35
Mycobacterium Tuberculosis DNA Detection by qPCR (GMP)
✅
3000005638
1e7 cells frozen
9
Replication-Competent AAV (rcAAV) Detection (R&D) Suitability
✅
3000007579
6e10 VG total; 0.5mL or above 1e+12 GC/mL
35
Replication-Competent AAV (rcAAV) Detection (GMP)
✅
3000007581
6e10 VG total; 0.5mL or above 1e+12 GC/mL
35
Potency
Cell Based Assay Indicative of MOA (GMP)
✅
✅
✅
Custom
Varies
TBD
Strength
Genomic Titer Assay by ddPCR Targeting Gene of Interest (GMP)
✅
✅
✅
✅
Custom
Varies
TBD
Genomic Titer Assay by qPCR Targeting Gene of Interest (GMP)
✅
✅
✅
✅
Custom
Varies
TBD
AAV Infectious Titer Assay on HEK-293 Cells (GMP)
✅
✅
✅
✅
3000007592
0.2mL
35
Determination of Adeno-Associated Virus Particles by ELISA for Various Serotypes (GMP)
✅
✅
✅
Varies
1mL
21
Quality
Sedimentation Velocity Analysis of Adeno-associated Virus (AAV) using Analytical Ultracentrifuge (AUC)
✅
✅
3000005181
0.5mL with a minimum concentration at 1e12 GC/mL
21
Dynamic Light Scattering Analysis for Determination of Particle Size of Virus Lots (GMP)
✅
✅
3000007812
0.1mL
8
Determination of Appearance According to the USP (GMP)
✅
✅
3000005469
2mL
7
USP<697> and EP 2.9.17 Determination of Extractable Volume in Containers (GMP)
✅
✅
3000005712
Varies2
14
USP<785> Determination of Osmolality (GMP)
✅
✅
3000007458
0.1mL
8
USP <791> Determination of the pH and Appearance (GMP)
✅
✅
3000004853
1mL
8
EU Appearance of Liquids (GMP)
✅
✅
3000005395
10mL
14
Identity
High Throughput Sequencing using Ion Torrent Genexus
✅
3000004999
Reference sequence, >/= 2e10 GC
18
Purity
Purified Viral Vector Purity Assessment by Western Blot
✅
Custom
Varies
TBD
Immunoenzymetric Assay for the Determination of HEK 293 Host Cell Proteins (GMP)
✅
3000004873
0.5mL
21
Determination of Sf9 Insect Cell Host Cell Proteins by ELISA (GMP)
✅
3000005149
1mL
21
Determination of Residual Capture Ligand by ELISA (GMP)
✅
Varies
Varies
21
Immunological Detection of Benzonase Endonuclease (GMP)
✅
3000004866
1mL
8
Determination of Residual Bovine Serum Albumin (BSA) by ELISA using Bethyl ELISA Kit E11-113 (GMP)
✅
3000004586
0.3mL
21
Quantitation of Residual Insect Sf9 DNA using PrepSEQ by qPCR (GMP)
✅
3000004735
0.5mL
11
Residual Iodexonal by HPLC (GMP)
✅
Custom
Varies
TBD
Residual PEI by HPLC (GMP)
✅
Custom
Varies
TBD
Quantitation of Residual DNA Using PrepSEQ™ and TaqMan® Technology by qPCR (GMP) – 7 Targets 18S (102bp, 200bp, 254bp, 401bp amplicons) + E1A + SV40 + E1B
✅
Varies
1mL
TBD
Quantification of Residual DNA using qPCR Targeting the nptII Kanamycin Resistance Gene (GMP)
✅
3000008407
0.1mL
21
Determination of Tween Concentration (GMP)
✅
3000005697
1mL
21

1 Ingress Study may need to be conducted if the container has not been previously validated.

2 1 container if contents are 10mL or more; 3 containers if volume is between 3 mL and <10mL; 5 containers if volume is <3mL.

Requirements Differ by Product Stage

  • While some core assays (e.g., stage, titer, purity, and safety) are consistently recommended, the scope, purpose, and stringency of testing differ for bulk harvest (BH), drug substance (DS), drug product (DP), and stability studies.

  • Testing evolves from broad, process-focused monitoring at bulk harvest to highly controlled, specification-based release at the drug substance and drug product stages. Stability testing then ensures that the released product maintains its identity, purity, potency, and safety throughout its shelf life.

  • Together, these testing stages form an integrated control strategy that ensures consistent AAV vector quality from manufacturing through patient administration.

Why Minaris?

Minaris Advanced Testing combines more than 40 years of biosafety expertise with advanced molecular biology and analytical capabilities to deliver robust and reliable AAV lot release testing. Its GMP-compliant laboratories support comprehensive safety, identity, purity, and potency testing using advanced PCR/ddPCR platforms and orthogonal analytical methods. A strong focus on rapid microbiological methods helps reduce turnaround times, while the adoption of next-generation sequencing enhances viral safety and genome integrity assessments. Together, these capabilities enable efficient, high-quality testing solutions that support AAV programs from early development through commercialization.

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Ready to discuss your AAV lot release testing needs? Our team is here to help.

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