Abstract
Yeasts represent one class of host for the production of recombinant proteins. Heterologous DNA is usually introduced into yeast strains in the form of multi-copy plasmids. During production, protein expression levels and rates are often limited by the stability of the recombinant organism. In this paper, we review the major factors affecting the stability of yeast strains containing multi-copy recombinant plasmids. Models for predicting plasmid loss are summarised, comparisons are made with relevant bacterial systems and strategies are described for overcoming such problems.
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