Joint distribution of insertion elements IS4 and IS5 in natural isolates of Escherichia coli

A reference collection of natural isolates of Escherichia coli has been studied in order to determine the distribution, abundance and joint occurrence of DNA insertion elements IS4 and IS5. Among these isolates, 36% were found to contain IS4 and 30% were found to contain IS5. Among strains containin...

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Bibliographic Details
Published in:Genetics (Austin) 1985-10, Vol.111 (2), p.219-231
Main Authors: DYKHUIZEN, D. E, SAWYER, A. A, GREEN, L, MILLER, R. D, HARTL, D. L
Format: Article
Language:English
Subjects:
Base Composition
Biological and medical sciences
DNA Restriction Enzymes
DNA Transposable Elements
Escherichia coli
Escherichia coli - genetics
Escherichia coli - isolation & purification
Fundamental and applied biological sciences. Psychology
Genic rearrangement. Recombination. Transposable element
Molecular and cellular biology
Molecular genetics
Nucleic Acid Hybridization
Plasmids
Species Specificity
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Summary:A reference collection of natural isolates of Escherichia coli has been studied in order to determine the distribution, abundance and joint occurrence of DNA insertion elements IS4 and IS5. Among these isolates, 36% were found to contain IS4 and 30% were found to contain IS5. Among strains containing IS4 the mean number of copies per strain was 4.4 +/- 0.8; the comparable figure for IS5 was 3.7 +/- 1.0. Although the presence of the elements among the isolates was independent, among those isolates containing both IS4 and IS5, there was a significant negative correlation in the number of copies of the elements. The reference collection was also studied for the presence of the DNA sequences flanking the single copy of IS4 in the chromosome of E. coli K12. Homologous sequences were found in only 26% of the isolates. The sequences flanking the IS4 invariably occur together, and their presence is significantly correlated with the presence of IS4. In eight of the strains that carry these flanking sequences, an IS4 is located between them, and the sequences are present at the homologous position as in the K12 strain. We suggest that IS4 and its flanking sequences share a common mechanism of dissemination, such as plasmids, and we present evidence that they are included in a much larger transposable element.
ISSN:0016-6731
1943-2631