Abstract
Among P1 transductants in Escherichia coli K-12 that were selected for the proximal and distal markers from the large F14 merogenote, a variety of unusual genotypes were found. As earlier workers had found, one class of these could transfer the proximal genes (argH, metB) and distal genes (ilvEDAC) of the F14 during conjugation. These F14 genes could be transferred into RecA recipients, indicating that they were carried on an F-merogenote rather than on an Hfr chromosome. The transduced F-merogenotes could transfer other F14 genes (metE, rha) as well. Transfer kinetic analysis showed that all of the latter transduced F-merogenotes that were examined were indistinguishable from the parental F14 in the order of transfer and the genetic distance between proximal and distal markers. This suggests that the whole F14 had been received somehow by the primary transductional recipients, a remarkable possibility since the F14 is much larger than the largest deoxyribonucleic acid segment normally transduced by P1. The mechanism of this phenomenon is not yet known. Many of the transductants did not transfer any of the F14 markers tested. Some of these transductants segregated certain F14 genes, indicating they were carried on self-replicating genetic elements, but others were not cured of F14 markers, even by acridine orange. Cotransductional analysis of this group was consistent with the hypothesis that the F14 markers in some of these strains had integrated into the chromosome in the expected manner, since in these latter the F14 alleles were linked to the expected chromosomal genes. Other strains among the stable transductants had acquired new linkages in that genes previously separated by several minutes could now be cotransduced. These latter included the novel cotransductional linkages of rbs-ilv-argH, rbs-ilv-argH-metB, and ilvD-argH-purD. Such strains might have been formed as a result of insertion into the chromosome of small circles derived from F14.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
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