Abstract
Autonomously-replicating, marker-less “helper” plasmids were added to transformations of Aspergillus nidulans with plasmids which normally transform by chromosomal integration. This resulted in as much as a 200-fold increase in transformation efficiency. Recovery of autonomously-replicating plasmid co-integrates indicated that co-transformation involves recombination between integrating and helper plasmids, which occurs at a high frequency. Increasing DNA sequence-homology between pairs of plasmids used in simultaneous transformations enhanced co-transformation efficiency. Using helper plasmids and an A. nidulans gene library in a normally-integrating vector, the genes adC and adD were cloned as part of such a co-integrate. In effect, the addition of helper plasmid converts an integrating into an autonomously-replicating gene library in vivo.
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Gems, D.H., Clutterbuck, A.J. Co-transformation with autonomously-replicating helper plasmids facilitates gene cloning from an Aspergillus nidulans gene library. Curr Genet 24, 520–524 (1993). https://doi.org/10.1007/BF00351716
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DOI: https://doi.org/10.1007/BF00351716