Genetic relationship of diarrheagenic Escherichia coli pathotypes among the enteropathogenic Escherichia coli O serogroup
Mem. Inst. Oswaldo Cruz
; 102(2): 169-174, Mar. 2007. tab
Article
em En
| LILACS
| ID: lil-447554
Biblioteca responsável:
BR1.1
ABSTRACT
The genetic relationship among the Escherichia coli pathotypes was investigated. We used random amplified polymorphic DNA (RAPD) data for constructing a dendrogram of 73 strains of diarrheagenic E. coli. A phylogenetic tree encompassing 15 serotypes from different pathotypes was constructed using multilocus sequence typing data. Phylogram clusters were used for validating RAPD data on the clonality of enteropathogenic E. coli (EPEC) O serogroup strains. Both analyses showed very similar topologies, characterized by the presence of two major groups group A includes EPEC H6 and H34 strains and group B contains the other EPEC strains plus all serotypes belonging to atypical EPEC, enteroaggregative E. coli (EAEC) and enterohemorrhagic E. coli (EHEC). These results confirm the existence of two evolutionary divergent groups in EPEC one is genetically and serologically very homogeneous whereas the other harbors EPEC and non-EPEC serotypes. The same situation was found for EAEC and EHEC.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Variação Genética
/
Técnicas de Tipagem Bacteriana
/
Escherichia coli
Limite:
Humans
Idioma:
En
Revista:
Mem. Inst. Oswaldo Cruz
Assunto da revista:
MEDICINA TROPICAL
/
PARASITOLOGIA
Ano de publicação:
2007
Tipo de documento:
Article
/
Project document
País de afiliação:
Brasil
País de publicação:
Brasil