Cited by 32CRISPR and Genetic EngineeringVirus-based gene therapy researchDNA Repair Mechanisms

Adeno-associated virus inverted terminal repeats stimulate gene editing

Open access
Hirsch, M L·2015·Gene Therapy

Abstract

Advancements in genome editing have relied on technologies to specifically damage DNA which, in turn, stimulates DNA repair including homologous recombination (HR). As off-target concerns complicate the therapeutic translation of site-specific DNA endonucleases, an alternative strategy to stimulate gene editing based on fragile DNA was investigated. To do this, an episomal gene-editing reporter was generated by a disruptive insertion of the adeno-associated virus (AAV) inverted terminal repeat (ITR) into the egfp gene. Compared with a non-structured DNA control sequence, the ITR induced DNA damage as evidenced by increased gamma-H2AX and Mre11 foci formation. As local DNA damage stimulates HR, ITR-mediated gene editing was investigated using DNA oligonucleotides as repair substrates. The AAV ITR stimulated gene editing >1000-fold in a replication-independent manner and was not biased by the polarity of the repair oligonucleotide. Analysis of additional human DNA sequences demonstrated stimulation of gene editing to varying degrees. In particular, inverted yet not direct, Alu repeats induced gene editing, suggesting a role for DNA structure in the repair event. Collectively, the results demonstrate that inverted DNA repeats stimulate gene editing via double-strand break repair in an episomal context and allude to efficient gene editing of the human chromosome using fragile DNA sequences.

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  • A defective eGFP reporter plasmid in dividing cells was rescued (gene-edited) by adding only the ITR2-eGFPpart(165 bp)-ITR2 with 40 bp eGFP homology arms adjacent to the ITR2.

    “A defective eGFP reporter plasmid in dividing cells was rescued (gene-edited) by adding only the ITR2-eGFPpart(165 bp)-ITR2 with 40 bp eGFP homology arms adjacent to the ITR2 [252].”

    From Recombinant Adeno-Associated Viral Vectors (rAAV)-Vector Elements in Ocular Gene Therapy Clinical Trials and Transgene Expression and Bioactivity Assays (2020) · cites this paper as [252]

    The Results and Discussion (Figure 3b; page not available in our copy) report repair of a defective eGFP plasmid reporter in human 293 cells using 40-nucleotide eGFP homology sequences. But the 165-nucleotide AAV2-ITR was inserted into the reporter plasmid, and repair required co-transfection with a separate single-stranded eGFP oligonucleotide. The paper does not describe rescuing the reporter by adding only an ITR-flanked eGFP fragment. (LLM, conf=0.88)

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Authors
Hirsch, M. L.
Affiliations
University of North Carolina at Chapel Hill (US)
Corresponding author
Hirsch, M L
Venue
Gene Therapy
Published
2014-12-11
Volume
22
Issue
2
Pages
190-195
ISSN
  • 0969-7128 (ISSN-L)
  • 1476-5462
OpenAlex
W1974598722
Cited by
32
References
48
Citations by year
2026: 3 · 2025: 2 · 2024: 4 · 2023: 2 · 2022: 6 · 2021: 1 · 2020: 4 · 2019: 2 · 2018: 1 · 2017: 3 · 2016: 1 · 2015: 3
FWCI
0.96
Type
journal article
Language
en
Open access
Locations
  • Gene Therapy (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Carolina Digital Repository (University of North Carolina at Chapel Hill) (submittedVersion)
  • UNC Libraries
Funders
  • Research to Prevent Blindness
  • Jain Foundation
  • National Institutes of Health
  • National Institute of Allergy and Infectious Diseases (R01AI072176)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (R01AR064369)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Virus-based gene therapy research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
Keywords
adeno-associated virus, inverted terminal repeats, genome editing, homologous recombination, DNA double-strand break repair, Alu elements, DNA structure, off-target effects
MeSH terms
Dependovirus, Base Sequence, DNA Repair, Genes, Viral, Genetic Engineering, Humans, Molecular Sequence Data, Genes, Reporter, Terminal Repeat Sequences, Green Fluorescent Proteins, DNA Breaks, Double-Stranded, Inverted Repeat Sequences, HEK293 Cells

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