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Related Experiment Video

Updated: Jun 23, 2026

A Quantitative Dot Blot Assay for AAV Titration and Its Use for Functional Assessment of the Adeno-associated Virus Assembly-activating Proteins
14:49

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Published on: June 12, 2018

Adeno-associated virus capsid serotype identification: Analytical methods development and application.

Kim Van Vliet1, Yasmin Mohiuddin, Scott McClung

  • 1Department of Molecular Genetics and Microbiology, University of Florida, College of Medicine, United States.

Journal of Virological Methods
|May 19, 2009
PubMed
Summary

Mass spectrometry (MS) provides a rapid method for identifying adeno-associated virus (AAV) capsid serotypes. This technique distinguishes between different AAV serotypes, ensuring the safety of gene transfer products.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Analytical Chemistry
  • Gene Therapy

Background:

  • Accurate identification of adeno-associated virus (AAV) capsid serotypes is crucial for gene therapy vector safety and efficacy.
  • Existing methods for serotype confirmation may lack the speed, reliability, or broad applicability required for a growing range of AAV vectors.
  • Physicochemical methods offer an alternative to antibody-based assays, potentially reducing reliance on product-specific reagents.

Purpose of the Study:

  • To establish and validate mass spectrometry (MS) as a rapid and reliable assay for confirming the capsid serotype identity of recombinant AAV (rAAV) gene transfer vectors.
  • To demonstrate the capability of MS to differentiate between highly homologous and less homologous AAV serotypes.
  • To assess the sensitivity of MS for detecting sequence variations, such as single amino acid mutations, within AAV capsids.

Main Methods:

  • Recombinant AAV (rAAV) vector capsids were subjected to proteolytic digestion.
  • Fragment masses generated from digested capsids were analyzed using mass spectrometry (MS).
  • Observed fragment masses were compared against common and custom databases for serotype identification and sequence variation analysis.

Main Results:

  • MS successfully identified and distinguished between various AAV serotypes, including highly homologous ones like AAV1, AAV2, and AAV8.
  • The method differentiated between less homologous serotypes such as AAV4 and AAV5.
  • MS demonstrated high sensitivity by accurately analyzing a wild-type AAV4 sample compared to an AAV4 variant with a single amino acid mutation.

Conclusions:

  • Mass spectrometry is a powerful and versatile physicochemical method for reliable AAV capsid serotype identification.
  • The MS-based assay is sensitive enough to detect sequence variations relevant to gene transfer applications, such as in retinal gene therapy.
  • This MS approach is suitable for cGMP lot release testing of rAAV gene transfer products, enhancing patient safety.