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Soth S, Takakura M, Suekawa M, Onishi T, Hirohata K, Hashimoto T, Maruno T, Fukuhara M, Tsunaka Y, Torisu T, Uchiyama S. Quantification of full and empty particles of adeno-associated virus vectors via a novel dual fluorescence-linked immunosorbent assay. Mol Ther Methods Clin Dev 2024; 32:101291. [PMID: 39070291 PMCID: PMC11283060 DOI: 10.1016/j.omtm.2024.101291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Accepted: 06/21/2024] [Indexed: 07/30/2024]
Abstract
The adeno-associated virus (AAV) vector is one of the most advanced platforms for gene therapy because of its low immunogenicity and non-pathogenicity. The concentrations of both AAV vector empty particles, which do not contain DNA and do not show any efficacy, and AAV vector full particles (FPs), which contain DNA, are important quality attributes. In this study, a dual fluorescence-linked immunosorbent assay (dFLISA), which uses two fluorescent dyes to quantify capsid and genome titers in a single analysis, was established. In dFLISA, capture of AAV particles, detection of capsid proteins, and release and detection of the viral genome are performed in the same well. We demonstrated that the capsid and genomic titers determined by dFLISA were comparable with those of analytical ultracentrifugation. The FP ratios determined by dFLISA were in good agreement with the expected values. In addition, we showed that dFLISA can quantify the genomic and capsid titers of crude samples. dFLISA can be easily modified for measuring other AAV vector serotypes and AAV vectors with different genome lengths. These features make dFLISA a valuable tool for the future development of AAV-based gene therapies.
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Affiliation(s)
- Sereirath Soth
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Mikako Takakura
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Masahiro Suekawa
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Takayuki Onishi
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kiichi Hirohata
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Tamami Hashimoto
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Takahiro Maruno
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Mitsuko Fukuhara
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yasuo Tsunaka
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Tetsuo Torisu
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Susumu Uchiyama
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
- Exploratory Research Center on Life and Living Systems, National Institutes of Natural Sciences, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan
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2
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Matsuzaka Y, Yashiro R. Therapeutic Application and Structural Features of Adeno-Associated Virus Vector. Curr Issues Mol Biol 2024; 46:8464-8498. [PMID: 39194716 DOI: 10.3390/cimb46080499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2024] [Revised: 07/02/2024] [Accepted: 07/12/2024] [Indexed: 08/29/2024] Open
Abstract
Adeno-associated virus (AAV) is characterized by non-pathogenicity, long-term infection, and broad tropism and is actively developed as a vector virus for gene therapy products. AAV is classified into more than 100 serotypes based on differences in the amino acid sequence of the capsid protein. Endocytosis involves the uptake of viral particles by AAV and accessory receptors during AAV infection. After entry into the cell, they are transported to the nucleus through the nuclear pore complex. AAVs mainly use proteoglycans as receptors to enter cells, but the types of sugar chains in proteoglycans that have binding ability are different. Therefore, it is necessary to properly evaluate the primary structure of receptor proteins, such as amino acid sequences and post-translational modifications, including glycosylation, and the higher-order structure of proteins, such as the folding of the entire capsid structure and the three-dimensional (3D) structure of functional domains, to ensure the efficacy and safety of biopharmaceuticals. To further enhance safety, it is necessary to further improve the efficiency of gene transfer into target cells, reduce the amount of vector administered, and prevent infection of non-target cells.
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Affiliation(s)
- Yasunari Matsuzaka
- Division of Molecular and Medical Genetics, Center for Gene and Cell Therapy, The Institute of Medical Science, The University of Tokyo, Minato-ku, Tokyo 108-8639, Japan
- Administrative Section of Radiation Protection, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira 187-8551, Japan
| | - Ryu Yashiro
- Administrative Section of Radiation Protection, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira 187-8551, Japan
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases, Tokyo 162-8640, Japan
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3
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Zhang J, Frabutt DA, Chrzanowski M, Li N, Miller LM, Tian J, Mulcrone PL, Lam AK, Draper BE, Jarrold MF, Herzog RW, Xiao W. A novel class of self-complementary AAV vectors with multiple advantages based on cceAAV lacking mutant ITR. Mol Ther Methods Clin Dev 2024; 32:101206. [PMID: 38390555 PMCID: PMC10881427 DOI: 10.1016/j.omtm.2024.101206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Accepted: 01/30/2024] [Indexed: 02/24/2024]
Abstract
Self-complementary AAV vectors (scAAV) use a mutant inverted terminal repeat (mITR) for efficient packaging of complementary stranded DNA, enabling rapid transgene expression. However, inefficient resolution at the mITR leads to the packaging of monomeric or subgenomic AAV genomes. These noncanonical particles reduce transgene expression and may affect the safety of gene transfer. To address these issues, we have developed a novel class of scAAV vectors called covalently closed-end double-stranded AAV (cceAAV) that eliminate the mITR resolution step during production. Instead of using a mutant ITR, we used a 56-bp recognition sequence of protelomerase (TelN) to covalently join the top and bottom strands, allowing the vector to be generated with just a single ITR. To produce cceAAV vectors, the vector plasmid is initially digested with TelN, purified, and then subjected to a standard triple-plasmid transfection protocol followed by traditional AAV vector purification procedures. Such cceAAV vectors demonstrate yields comparable to scAAV vectors. Notably, we observed enhanced transgene expression as compared to traditional scAAV vectors. The treatment of mice with hemophilia B with cceAAV-FIX resulted in significantly enhanced long-term FIX expression. The cceAAV vectors hold several advantages over scAAV vectors, potentially leading to the development of improved human gene therapy drugs.
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Affiliation(s)
- Junping Zhang
- Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Dylan A. Frabutt
- Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | | | - Ning Li
- Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | | | - Jiahe Tian
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853, USA
| | - Patrick L. Mulcrone
- Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Anh K. Lam
- Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | | | - Martin F. Jarrold
- Chemistry Department, Indiana University, Bloomington, IN 47405, USA
| | - Roland W. Herzog
- Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Weidong Xiao
- Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
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4
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Li X, Miller LM, Chrzanowski M, Tian J, Jarrold MF, Herzog RW, Xiao W, Draper B, Zhang J. Quantitative analysis of preferential utilization of AAV ITR as the packaging terminal signal. Front Bioeng Biotechnol 2023; 11:1327433. [PMID: 38173872 PMCID: PMC10761532 DOI: 10.3389/fbioe.2023.1327433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 12/05/2023] [Indexed: 01/05/2024] Open
Abstract
Genetic engineering advances have led to recombinant adeno-associated virus (rAAV) becoming an invaluable tool for the development of effective gene therapies. The production of rAAV is susceptible to off-target heterogeneous packaging, the effects of which are still being understood. Here, rAAV vectors with four-genome lengths were produced using both adherent and suspension HEK293 cells to understand the 5'ITR termination. AAV8 vectors were produced from the human FVIII plasmid for a full-length cargo of 4,707 nucleotides with specific truncations, creating smaller genomes. Conventionally, rAAV is characterized by differentiating empty capsids from full capsids, but for this work, that description is incomplete. The small genomes in this study were characterized by charge detection-mass spectrometry (CD-MS). Using CD-MS, packaged genomes in the range conventionally attributed to partials were resolved and quantified. In addition, alkaline gels and qPCR were used to assess the identity of the packaged genomes. Together, these results showed a propensity for unit-length genomes to be encapsidated. Packaged genomes occurred as replication intermediates emanating from the 5'ITR, indicating that HEK293 cells prefer unit-length genomes as opposed to the 5'ITR termination and heterogeneous DNA packaging observed previously from Sf9 cell systems. As both manufacturing processes are used and continually assessed to produce clinical material, such an understanding will benefit rAAV design for basic research and gene therapy.
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Affiliation(s)
- Xin Li
- Herman B Wells Center for Pediatric Research, Indiana University IUSM, Indianapolis, IN, United States
| | | | | | - Jiahe Tian
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY, United States
| | - Martin F. Jarrold
- Chemistry Department, Indiana University, Bloomington, IN, United States
| | - Roland W. Herzog
- Herman B Wells Center for Pediatric Research, Indiana University IUSM, Indianapolis, IN, United States
| | - Weidong Xiao
- Herman B Wells Center for Pediatric Research, Indiana University IUSM, Indianapolis, IN, United States
| | | | - Junping Zhang
- Herman B Wells Center for Pediatric Research, Indiana University IUSM, Indianapolis, IN, United States
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Huang X, Wang X, Ren Y, Gao P, Xu W, Xie X, Diao Y. Reactive oxygen species enhance rAAV transduction by promoting its escape from late endosomes. Virol J 2023; 20:2. [PMID: 36611172 PMCID: PMC9825130 DOI: 10.1186/s12985-023-01964-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 01/04/2023] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Recent seminal studies have revealed that endosomal reactive oxygen species (ROS) promote rather than inhibit viral infection. Some ROS generators, including shikonin and H2O2, have the potential to enhance recombinant adeno-associated virus (rAAV) transduction. However, the impact of ROS on rAAV intracellular trafficking remains unclear. METHODS To understand the effects of ROS on the transduction of rAAV vectors, especially the rAAV subcellular distribution profiles, this study systematically explored the effect of ROS on each step of rAAV intracellular trafficking pathway using fluorescently-labeled rAAV and qPCR quantification determination. RESULTS The results showed promoted in-vivo and in-vitro rAAV transduction by ROS exposure, regardless of vector serotype or cell type. ROS treatment directed rAAV intracellular trafficking towards a more productive pathway by upregulating the expression of cathepsins B and L, accelerating the rAAV transit in late endosomes, and increasing the rAAV nucleus entry. CONCLUSIONS These data support that ROS generative drugs, such as shikonin, have the potential to promote rAAV vector transduction by promoting rAAV's escape from late endosomes, and enhancing its productive trafficking to the nucleus.
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Affiliation(s)
- Xiaoping Huang
- grid.449406.b0000 0004 1757 7252College of Chemical Engineering and Materials Sciences, Quanzhou Normal University, Quanzhou, China
| | - Xiao Wang
- grid.411404.40000 0000 8895 903XSchool of Medicine, Huaqiao University, Quanzhou, China
| | - Yanxuan Ren
- grid.411404.40000 0000 8895 903XSchool of Medicine, Huaqiao University, Quanzhou, China
| | - Pingzhang Gao
- grid.449406.b0000 0004 1757 7252College of Chemical Engineering and Materials Sciences, Quanzhou Normal University, Quanzhou, China
| | - Wentao Xu
- grid.449406.b0000 0004 1757 7252College of Chemical Engineering and Materials Sciences, Quanzhou Normal University, Quanzhou, China
| | - Xiaolan Xie
- College of Chemical Engineering and Materials Sciences, Quanzhou Normal University, Quanzhou, China.
| | - Yong Diao
- School of Medicine, Huaqiao University, Quanzhou, China.
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Barnes LF, Draper BE, Jarrold MF. Analysis of thermally driven structural changes, genome release, disassembly, and aggregation of recombinant AAV by CDMS. Mol Ther Methods Clin Dev 2022; 27:327-336. [PMID: 36381304 PMCID: PMC9630626 DOI: 10.1016/j.omtm.2022.10.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 10/12/2022] [Indexed: 12/13/2022]
Abstract
Charge detection mass spectrometry (CDMS) was used to analyze recombinant adeno-associated virus serotype 8 (rAAV8) vectors after incubation at elevated temperatures. rAAV8 vectors with a range of genomes of interest (GOIs) from 2.22 to 4.84 kb were investigated. For the shorter GOIs, GOI release occurred at surprisingly low temperatures (15 min at 45°C for cytomegalovirus [CMV]-GFP). The released DNA and intermediates with the GOI extruded from the capsid were detected. The temperature required to release the short GOIs is well below the 65°C incubation temperature required to disassemble the empty rAAV8 capsid. The temperature for GOI release increased with its GOI length. With the longer GOIs, the GOI stabilized the capsid so that it remained intact under conditions that would disassemble the empty particle. After incubation at 65°C, the main species in the CDMS mass distributions for the longer GOIs was the vector with the GOI. However, for GOIs longer than the wild-type genome (∼4.7 kb), the stability diminished, and genome release occurred at a lower temperature. Heterogeneous DNA fragments from the host cells or plasmids is released at a lower temperature than the longer GOIs, suggesting that the GOIs have a feature that resists early release.
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Affiliation(s)
- Lauren F. Barnes
- Chemistry Department, Indiana University, 800 E Kirkwood Avenue, Bloomington, IN 47405, USA
| | - Benjamin E. Draper
- Megadalton Solutions, Inc., 3750 E Bluebird Ln, Bloomington, IN 47401, USA
| | - Martin F. Jarrold
- Chemistry Department, Indiana University, 800 E Kirkwood Avenue, Bloomington, IN 47405, USA,Corresponding author Martin F. Jarrold, Chemistry Department, Indiana University, 800 E Kirkwood Avenue, Bloomington, IN 47405, USA.
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7
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Guapo F, Strasser L, Millán-Martín S, Anderson I, Bones J. Fast and efficient digestion of adeno associated virus (AAV) capsid proteins for liquid chromatography mass spectrometry (LC-MS) based peptide mapping and post translational modification analysis (PTMs). J Pharm Biomed Anal 2022; 207:114427. [PMID: 34757284 DOI: 10.1016/j.jpba.2021.114427] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 10/07/2021] [Accepted: 10/09/2021] [Indexed: 12/19/2022]
Abstract
Adeno-associated virus (AAV) represent a widely used delivery mechanism for gene therapy treatments currently being developed. The size and complexity of these molecules requires the development of sensitive analytical methods for detailed product characterization. Among the quality attributes that need to be monitored, characterization of the AAV capsid protein amino acid sequences and any associated post translational modifications (PTM) present, should be performed. As commonly used for recombinant protein analysis, LC-MS based peptide mapping can provide sequence coverage and PTM information to improve product understanding and the development and deployment of the associated manufacturing processes. In the current study, we report a fast and efficient method to digest AAV5 capsid proteins in only 30 min prior to peptide mapping analysis. The performance of different proteases in digesting AAV5 was compared and the benefits of using nanoflow liquid chromatography for separation prior to high resolution mass spectrometry to obtain 100% sequence coverage are highlighted. Characterization and quantitation of PTMs on AAV5 capsid proteins when using pepsin as a single protease is reported, thereby demonstrating the potential of this method to aid with complete characterization of AAV serotypes in gene therapy development laboratories.
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Affiliation(s)
- Felipe Guapo
- Characterization and Comparability Laboratory, NIBRT - National Institute for Bioprocessing Research and Training, Foster Avenue, Belfield, Blackrock, Dublin A94 X099, Ireland
| | - Lisa Strasser
- Characterization and Comparability Laboratory, NIBRT - National Institute for Bioprocessing Research and Training, Foster Avenue, Belfield, Blackrock, Dublin A94 X099, Ireland
| | - Silvia Millán-Martín
- Characterization and Comparability Laboratory, NIBRT - National Institute for Bioprocessing Research and Training, Foster Avenue, Belfield, Blackrock, Dublin A94 X099, Ireland
| | - Ian Anderson
- Pharmaron, 12 Estuary Banks, Speke, Liverpool L24 8RB, United Kingdom
| | - Jonathan Bones
- Characterization and Comparability Laboratory, NIBRT - National Institute for Bioprocessing Research and Training, Foster Avenue, Belfield, Blackrock, Dublin A94 X099, Ireland; School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin D04 V1W8, Ireland.
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8
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Quan DN, Shiloach J. rAAV Production and Titration at the Microscale for High-Throughput Screening. Hum Gene Ther 2022; 33:94-102. [PMID: 34328798 PMCID: PMC8819507 DOI: 10.1089/hum.2021.080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
In the literature, there are few high-throughput screens or even methods for high-throughput screens of recombinant adeno-associated virus (rAAV) production despite potential benefits to research and production. In this study, a generalizable high-throughput relative rAAV titration method is examined within the context of an siRNA screen as siRNA knockdown is a common means of pathway engineering in bioproduction. Crude samples generated from transfected HEK293T/17 cultures were subjected to quantitative PCR (qPCR) and used to transduce COS7 cells to assess relative differences in genomic and infectious rAAV titer, respectively, at the 384-well scale, evaluating both supernatant and lysed samples. To evaluate relevant differences in titer for conditions that could be used in an actual screen, cultures subjected to an siRNA reverse transfection and subsequent rAAV forward transfection were also tested. The delayed forward rAAV triple-plasmid transfection was not seen to affect the siRNA activity of tested controls, while siRNA transfection was shown to measurably impact rAAV titer. Effective differentiation between infectious titer levels was dependent upon the choice of sample dilution, but trends between qPCR and infectious titer assays were consistent across sample sets.
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Affiliation(s)
- David Nathan Quan
- NIDDK Biotechnology Core, NIDDK, National Institutes of Health, Bethesda, Maryland, USA
| | - Joseph Shiloach
- NIDDK Biotechnology Core, NIDDK, National Institutes of Health, Bethesda, Maryland, USA.,Correspondence: Dr. Joseph Shiloach, NIDDK Biotechnology Core, National Institutes of Health, 14 Service Road W, Bethesda, MD 20894, USA.
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9
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Barnes LF, Draper BE, Chen YT, Powers TW, Jarrold MF. Quantitative analysis of genome packaging in recombinant AAV vectors by charge detection mass spectrometry. Mol Ther Methods Clin Dev 2021; 23:87-97. [PMID: 34631929 PMCID: PMC8476707 DOI: 10.1016/j.omtm.2021.08.002] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 08/16/2021] [Indexed: 12/13/2022]
Abstract
Recombinant adeno-associated virus (rAAV) has emerged as an important gene therapy vector with many clinical trials currently in progress. Analytical characterization and quantitation of particle content remain challenges in both the development and production of rAAV vectors. In this study, charge detection mass spectrometry (CDMS) and gel electrophoresis are used to characterize the DNA content of recombinant AAV8 (rAAV8) vectors with a wide range of target genome sizes. We show that the differences between the masses of empty particles and particles with the genome of interest (GOI) are correlated with the expected genome mass. A small systematic deviation (around 2%) is attributed to the packaging of counterions along with the DNA. In addition to the GOI, a broad distribution of heterogeneous DNA is packaged. The distribution peaks are close to the packaging capacity of the rAAV8 vectors. There is also evidence for the co-packaging of small DNA fragments along with the GOI. Finally, we present evidence that incubation at an elevated temperature can reduce the heterogeneity of the packaged DNA. Taken together, these results show that CDMS is a viable tool for characterization of the packaged genome.
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Affiliation(s)
- Lauren F Barnes
- Chemistry Department, Indiana University, 800 East Kirkwood Avenue, Bloomington, IN 47405, USA
| | - Benjamin E Draper
- Chemistry Department, Indiana University, 800 East Kirkwood Avenue, Bloomington, IN 47405, USA
| | - Yu-Ting Chen
- Pfizer, Inc., BioTherapeutics Pharmaceutical Sciences, Analytical R&D, 875 Chesterfield Parkway West, Chesterfield, MO 63017, USA
| | - Thomas W Powers
- Pfizer, Inc., BioTherapeutics Pharmaceutical Sciences, Analytical R&D, 875 Chesterfield Parkway West, Chesterfield, MO 63017, USA
| | - Martin F Jarrold
- Chemistry Department, Indiana University, 800 East Kirkwood Avenue, Bloomington, IN 47405, USA
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