Baculoviral vector-mediated transient and stable transgene expression in human embryonic stem cells

Area of Science:

• Stem Cell Biology
• Gene Therapy
• Molecular Virology

Background:

• Human embryonic stem cells (hESCs) are a valuable renewable resource for developmental biology and regenerative medicine.
• Effective and safe genetic manipulation methods are crucial for realizing the potential of hESCs.
• Current methods for genetic modification of hESCs have limitations.

Purpose of the Study:

• To evaluate the efficacy and safety of baculoviral vectors for genetic manipulation of hESCs.
• To develop baculoviral vectors for both transient and stable transgene expression in hESCs.
• To assess the impact of baculoviral transduction on hESC characteristics.

Main Methods:

• Utilized recombinant baculoviral vectors with a human elongation factor 1-alpha promoter for transient transduction.
• Developed hybrid baculoviral vectors incorporating adeno-associated virus rep gene and inverted terminal repeat sequences for stable expression.
• Assessed transduction efficiency, transgene expression levels, and effects on hESC growth, phenotype, and pluripotency.

Main Results:

• Baculoviral vectors achieved efficient transduction of hESCs, reaching up to 80% in cell clumps and embryoid bodies.
• Transient transduction resulted in high levels of transgene expression.
• Hybrid baculoviral vectors enabled stable transgene expression during prolonged undifferentiated proliferation and after differentiation.
• Baculoviral transduction did not adversely affect hESC growth, phenotype, or pluripotency.

Conclusions:

• Baculoviral vectors are effective tools for the genetic manipulation of hESCs.
• These vectors support both transient overexpression and long-term stable gene expression.
• Baculoviral transduction offers a safe and efficient method for modifying hESCs for research and therapeutic applications.