Strategy and Application of Viral Potency Assays in Cell and Gene Therapy

Area of Science:

• Biotechnology
• Molecular Biology
• Therapeutic Development

Background:

• Viral vectors are essential for cell and gene therapy, requiring rigorous quality control.
• Ensuring the safety, efficacy, and consistency of viral products is paramount throughout development and manufacturing.
• Regulatory standards necessitate precise methods for assessing viral vector biological activity.

Purpose of the Study:

• To review key aspects of viral potency assay development for viral vectors.
• To highlight the importance of genome, physical, infectious, and functional titers.
• To provide a practical guide for researchers and manufacturers on potency evaluation.

Main Methods:

• Exploration of viral potency assay development methodologies.
• Focus on digital droplet PCR (ddPCR) for precise viral genome titer quantification.
• Emphasis on flow cytometry-based assays for assessing functional potency via transduction and expression.

Main Results:

• ddPCR offers high sensitivity and accuracy for absolute viral genome titer measurements.
• Flow-based assays effectively quantify transduction efficiency and transgene expression.
• A combination of methods provides a robust matrix for potency measurement.

Conclusions:

• Robust viral potency assays are critical for meeting regulatory standards in viral vector production.
• Accurate potency measurement ensures the quality, safety, and efficacy of viral vectors for clinical use.
• These assays support the consistent production and evaluation of viral vectors for therapeutic applications.