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J. Bacteriol., 03 1997, 1550-1554, Vol 179, No. 5
Copyright © 1997, American Society for Microbiology

Nonadaptive mutations occur on the F' episome during adaptive mutation conditions in Escherichia coli

PL Foster
Department of Environmental Health, Boston University School of Public Health, Massachusetts 02118-2394, USA. pfoster@bu.edu

One of the most studied examples of adaptive mutation is a strain of Escherichia coli, FC40, that cannot utilize lactose (Lac-) but that readily reverts to lactose utilization (Lac+) when lactose is its sole carbon source. Adaptive reversion to Lac+ occurs at a high rate when the Lac- allele is on an F' episome and conjugal functions are expressed. It was previously shown that nonselected mutations on the chromosome did not appear in the Lac- population while episomal Lac+ mutations accumulated, but it remained possible that nonselected mutations might occur on the episome. To investigate this possibility, a second mutational target was created on the Lac- episome by mutation of a Tn1O element, which encodes tetracycline resistance (Tetr), to tetracycline sensitivity (Tets). Reversion rates to Tetr during normal growth and during lactose selection were measured. The results show that nonselected Tetr mutations do accumulate in Lac- cells when those cells are under selection to become Lac+. Thus, reversion to Lac+ in FC40 does not appear to be adaptive in the narrow sense of the word. In addition, the results suggest that during lactose selection, both Lac+ and Tetr mutations are created or preserved by the same recombination- dependent mechanism.


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