Engineering high-titer lentiviral vectors for robust expression of RNA-based gene circuits

Area of Science:

• Molecular Biology
• Gene Therapy
• Synthetic Biology

Background:

• Lentiviral vectors are crucial for gene and cell therapies, with a ~10-kb packaging limit suitable for compact gene circuits.
• RNA-based devices offer precise genetic control but can disrupt lentiviral vector production due to interactions with the viral RNA genome.

Purpose of the Study:

• To investigate the impact of gene syntax and genetic elements on the production of two-gene lentiviral vectors encoding RNA devices.
• To establish design strategies for high-titer lentiviral vectors that incorporate functional RNA devices.

Main Methods:

• Systematic examination of gene syntax and genetic parts within two-gene lentiviral vectors.
• Analysis of vector titer and expression levels in relation to RNA device integration and vector production efficiency.

Main Results:

• Vector titer significantly decreases when genetic parts interfere with viral transcript transcription or processing during production.
• The optimized vector design achieved a titer increase of over 30-fold compared to initial designs.
• Enhanced vector designs enable fine-tuned expression for optimizing cell-fate conversion.

Conclusions:

• Design principles for high-titer, two-gene lentiviral vectors incorporating RNA devices have been elucidated.
• Optimized lentiviral vector construction enhances efficacy for gene and cell therapy applications.
• This work provides a framework for robust lentiviral vector design with integrated RNA regulatory elements.