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Whole-virus vaccine development by continuous culture on a complementing host

D Kong¹, J Yin

¹Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755-8000, USA.

Bio/Technology (Nature Publishing Company)

|June 1, 1995

Summary

An adaptive strategy using bacteriophage T7 evolved faster-replicating variants. These whole-virus vaccine candidates were immunogenically similar to wildtype, suggesting a viable vaccine development approach.

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Area of Science:

Virology
Vaccine Development
Biotechnology

Background:

Developing safe and effective whole-virus vaccines is a critical area of research.
Adaptive strategies offer a novel approach to vaccine design.
Bacteriophage T7 serves as a robust model system for studying viral evolution.

Purpose of the Study:

To evaluate an adaptive strategy for generating whole-virus vaccines.
To assess the feasibility of using bacteriophage evolution for vaccine development.
To characterize the properties of evolved phage variants.

Main Methods:

Cultivating wildtype phage T7 in a continuous stirred-tank reactor (CSTR) with a recombinant E. coli host.
Monitoring phage evolution over 180 generations.

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Analyzing evolved phage variants for host-ranges, restriction patterns, and growth rates.

Assessing the immunogenicity of the fittest variant through antiserum cross-reactivity.

Main Results:

A diversity of phage variants emerged, with fitter variants outcompeting the wildtype.
The fittest variant exhibited a 12% genome deletion and doubled replication speed compared to wildtype.
This optimized variant required complementation by the recombinant host for growth.
Immunological assays showed the fittest variant was indistinguishable from the wildtype.

Conclusions:

The adaptive strategy successfully generated fitter bacteriophage variants.
The evolved variants, particularly the fittest one, demonstrate potential as safe whole-virus vaccine candidates.
This study supports the feasibility of using adaptive evolution for developing novel vaccines.