Volume 172, Issue 2 pp. 145-151

Clonal relationship among invasive and non-invasive strains of enteroinvasive Escherichia coli serogroups

Marina B Martinez

Corresponding Author

Marina B Martinez

Faculdade de Ciencias Farmaceuticas, Departamento de Analises Clinicas e Toxicologicas, Universidade de Sao Paulo, Av. Prof. Lineu Prestes 580, Sao Paulo-SP, 05508-900 Brazil

*Corresponding author. Tel.: +55 (11) 818-3636; Fax: +55 (11) 813-2197; E-mail: [email protected]Search for more papers by this author
Thomas S Whittan

Thomas S Whittan

Institute of Molecular Evolutionary Genetics, Department of Biology, The Pennsylvania State University, University Park, PA 16802, USA

Search for more papers by this author
Elizabeth A McGraw

Elizabeth A McGraw

Institute of Molecular Evolutionary Genetics, Department of Biology, The Pennsylvania State University, University Park, PA 16802, USA

Search for more papers by this author
Josias Rodrigues

Josias Rodrigues

Instituto de Biociencias-UNESP, Botucatu-SP, Brazil

Search for more papers by this author
Luiz R Trabulsi

Luiz R Trabulsi

Instituto Butantan, Sao Paulo-SP, Brazil

Search for more papers by this author
First published: 17 January 2006
Citations: 1

Abstract

The genetic relatedness among 96 invasive Escherichia coli belonging to several serogroups and 13 non-invasive of several serotypes that share the same O antigen was investigated by multilocus enzyme electrophoresis analysis. The invasive strains were isolated in different parts of the world and most of them recovered from dysentery. Twenty-nine electrophoretic types were distinguished and the most invasive strains were found to belong to two major lineages. These results suggested that the invasive ability in these strains has evolved in divergent chromosomal backgrounds, presumably through the horizontal spread of plasmid-borne invasion genes. The maintenance of invasive phenotypes in separate lineages suggests that this ability confers a selective advantage to invasive strains.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.