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Gutless Helper-Dependent and First-Generation HAdV5 Vectors Have Similar Mechanical Properties and Common
Lars Thalmann1, Natalia Martin-Gonzalez2, Dominik Brücher3
1Department of Molecular Life Sciences, University of Zürich, Zürich, Switzerland.
Human Gene Therapy
|February 22, 2024
Summary
Helper-dependent adenovirus (HD-AdV) vectors show promise for gene therapy. Genome length minimally impacts physical properties and cell entry, reinforcing their therapeutic potential for effective gene delivery.
Area of Science:
- Virology
- Gene Therapy
- Biophysics
Background:
- Human adenoviruses (HAdVs) are extensively developed for gene delivery.
- Helper-dependent adenovirus (HD-AdV) vectors, lacking viral coding information, offer therapeutic promise.
- Physical properties and transduction efficiency of HD-AdVs require further investigation.
Purpose of the Study:
- To investigate the effect of genome length on human adenovirus C5 (HAdV-C5) vector transduction.
- To analyze the physical properties and cell entry mechanisms of HAdV-C5 vectors with varying genome lengths.
Main Methods:
- Single-cell and single virus particle assays were employed.
- Atomic force microscopy was used to measure physical and mechanical features.
- Transduction efficiency was assessed in various cell lines, including murine alveolar macrophage-like MPI-2 cells.
Main Results:
- HAdV-C5 vectors with different genome lengths (wild-type, first-generation, and HD-AdVs) exhibited similar attachment, uptake, and endosome penetration.
- Genome length variations (94%–103% of HAdV-C5) had minimal impact on physical and mechanical properties.
- An HD-AdV-C5 with a ~30 kbp genome was slightly stiffer and less heat-resistant but showed comparable transduction efficiency.
Conclusions:
- HD-AdV vectors are suitable for efficient single-round gene delivery.
- Physical properties and cell entry behavior of single virus particles provide functional insights for therapeutic applications.
- Further research into vector design can optimize gene delivery efficacy.
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