We compared the transducing properties of Mucts62 and Mucts62/mini-Mu lysates, using Mu immune and non immune Rec+ and recA recipient strains. The Mu/mini-Mu lysates transduced all bacterial markers tested 10 times more efficiently than the Mucts62 lysates in Rec+ recipients. Most of the transductants obtained after infection with the Mu/mini-Mu lysates result from the substitution of the mutated gene of the recipient by the wild type allele from the donor, most probably carried on the gigantic variable end linked to the mini-Mu genome.
Moreover the Mu/mini-Mu lysates gave a new type of Rec-independent transduction that we called mini-muduction. Mini-muduction requires the activity of Mu gene A and provides transductants which carry the transduced marker surrounded by two mini-Mu genomes similarly oriented, and inserted at random location in the recipient chromosome. The mini-Mu/transduced DNA/mini-Mu structures are able to transpose spontaneously, for instance into a transmissible plasmid, in the presence of Mu gene A product.
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Communicated by J. Schell
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Faelen, M., Toussaint, A. & Resibois, A. Mini-muduction: A new mode of gene transfer mediated by mini-Mu. Molec. Gen. Genet. 176, 191–197 (1979). https://doi.org/10.1007/BF00273213
- Gene Transfer
- Wild Type Allele
- Random Location
- Type Allele
- Recipient Strain