title: The variation in frequency with which markers are transduced by phage P1 is primarily a result of discrimination during recombination.
abstract: The efficiency of recovery of P1 transductants is marker dependent and normally varies over a 25-fold range. UV irradiation of either transducing lysates for recipient cells results in a selective stimulation of the transduction of markers which are normally transduced poorly. As a result the range in frequency of transduction is reduced to about 3-fold and resembles the gene frequency distribution expected in the donor cells. We conclude that P1 transducing lysates are likely to contain a random sample of donor DNA but that the recombination system of the recipient cell exhibits a preference for the DNA of some regions over that of others. Damage to DNA presumably overrides this specificity.
mesh_terms: D003090:Coliphages / Q000235:genetics*; D004269:DNA, Bacterial / Q000235:genetics / Q000528:radiation effects; D004926:Escherichia coli / Q000235:genetics*; D005787:Gene Frequency; D005819:Genetic Markers; D011995:Recombination, Genetic / Q000528:radiation effects; D014161:Transduction, Genetic / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D004269:DNA, Bacterial; D005819:Genetic Markers