SUMMARY: Donor and recipient strains were isolated from a single clinical isolate of an O4. Strain Z20 is a low-frequency donor which transfers a variety of markers to the recipient strain, CF2004--6. However, the recombination frequency for the tryptophan marker occurs at a somewhat higher frequency. The fact that all recombinants become donors and donor ability can be temporarily derepressed, suggests that this intra-strain conjugation system depends upon a repressed sex factor, termed the Z factor. When a lysogenic donor strain is used, the phage genome also is transferred during conjugation to a majority of the recombinants. This leads to a state of ‘transient lysogeny’ in which all recombinants segregate non-lysogens.


Article metrics loading...

Loading full text...

Full text loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error