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Updated: Aug 18, 2026
Transgene Expression in Cultured Cells Using Unpurified Recombinant Adeno-Associated Viral Vectors
Published on: October 20, 2023
Gene targeting by adeno-associated virus vectors is cell-cycle dependent
Grant Trobridge1, Roli K Hirata, David W Russell
1Division of Hematology, Department of Medicine, University of Washington, Seattle, WA 98195, USA.
Abstract:
Adeno-associated virus (AAV) vectors can be used to introduce site-specific mutations into homologous chromosomal sequences. There are many potential applications of this technique, but the process of AAV-mediated gene targeting and factors that influence targeting efficiency are not completely understood. We investigated the dependence of AAV-mediated gene targeting on the host cell-cycle status. The frequency of gene targeting by AAV vectors was compared in dividing and serum-arrested normal human fibroblast cultures. Gene targeting occurred in arrested fibroblast cultures at 0.15 to 1.1% the frequency of dividing cultures, and only took place in cells that had undergone DNA synthesis. Gene targeting was also reduced when DNA synthesis was inhibited by hydroxyurea.
Insights
Adeno-associated virus (AAV) gene targeting efficiency depends on cell division. Targeting occurred only in cells that synthesized DNA, with significantly lower frequencies in arrested human fibroblasts.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Adeno-associated virus (AAV) vectors enable precise genetic modifications in homologous chromosomal sequences.
- Understanding AAV-mediated gene targeting mechanisms and efficiency factors is crucial for therapeutic applications.
Purpose of the Study:
- To investigate the influence of host cell-cycle status on AAV-mediated gene targeting efficiency.
- To determine if DNA synthesis is a prerequisite for successful gene targeting by AAV vectors.
Main Methods:
- Comparison of AAV-mediated gene targeting frequencies in dividing versus serum-arrested human fibroblast cultures.
- Assessment of gene targeting in cells with inhibited DNA synthesis using hydroxyurea.
Main Results:
- Gene targeting in arrested fibroblasts occurred at 0.15% to 1.1% the frequency observed in dividing cultures.
- Gene targeting was exclusively observed in cells that had undergone DNA synthesis.
- Inhibition of DNA synthesis by hydroxyurea significantly reduced gene targeting rates.
Conclusions:
- Host cell-cycle status, specifically DNA synthesis, is a critical determinant of AAV-mediated gene targeting efficiency.
- AAV gene targeting is most effective in actively dividing cells that are undergoing DNA replication.
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