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Mosaic Structure of Plasmids From Natural Populations of Escherichia coli

E. Fidelma Boyd, Charles W. Hill, Stephen M. Rich and Daniel L. Hartl
Genetics July 1, 1996 vol. 143 no. 3 1091-1100
E. Fidelma Boyd
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
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Charles W. Hill
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
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Stephen M. Rich
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
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Daniel L. Hartl
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
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  • For correspondence: d-hartl@haIvard.edu
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Abstract

The distribution of plasmids related to the fertility factor F was examined in the ECOR reference collection of Escherichia coli. Probes specific for four F-related genes were isolated and used to survey the collection by DNA hybridization. To estimate the genetic diversity of genes in F-like plasmids, DNA sequences were obtained for four plasmid genes. The phylogenetic relationships among the plasmids in the ECOR strains is very different from that of the strains themselves. This finding supports the view that plasmid transfer has been frequent within and between the major groups of ECOR. Furthermore, the sequences indicate that recombination between genes in plasmids takes place at a considerably higher frequency than that observed for chromosomal genes. The plasmid genes, and by inference the plasmids themselves, are mosaic in structure with different regions acquired from different sources. Comparison of gene sequences from a variety of naturally occurring plasmids suggested a plausible donor of some of the recombinant regions as well as implicating a chi site in the mechanism of genetic exchange. The relatively high rate of recombination in F-plasmid genes suggests that conjugational gene transfer may play a greater role in bacterial population structure than previously appreciated.

  • Received December 10, 1995.
  • Accepted March 27, 1996.
  • Copyright © 1996 by the Genetics Society of America
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Volume 143 Issue 3, July 1996

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Mosaic Structure of Plasmids From Natural Populations of Escherichia coli

E. Fidelma Boyd, Charles W. Hill, Stephen M. Rich and Daniel L. Hartl
Genetics July 1, 1996 vol. 143 no. 3 1091-1100
E. Fidelma Boyd
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Charles W. Hill
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Stephen M. Rich
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Daniel L. Hartl
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: d-hartl@haIvard.edu
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Citation

Mosaic Structure of Plasmids From Natural Populations of Escherichia coli

E. Fidelma Boyd, Charles W. Hill, Stephen M. Rich and Daniel L. Hartl
Genetics July 1, 1996 vol. 143 no. 3 1091-1100
E. Fidelma Boyd
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Charles W. Hill
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Stephen M. Rich
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Daniel L. Hartl
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: d-hartl@haIvard.edu

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