A novel IncQ plasmid type harbouring a class 3 integron from Escherichia coli

作者：Poirel Laurent; Carattoli Alessandra; Bernabeu Sandrine; Bruderer Thomas; Frei Reno; Nordmann Patrice^*

来源：Journal of Antimicrobial Chemotherapy, 2010, 65(8): 1594-1598.

DOI：10.1093/jac/dkq166

• IncQ
• ESBLs
• GES-1

To determine the genetic structures at the origin of the mobilization of the extended-spectrum beta-lactamase (ESBL) bla(GES-1) gene in an Escherichia coli clinical isolate.
ESBL-encoding genes and class 1 or class 3 integron-specific motifs were screened. Conjugation experiments were performed to determine whether the plasmid-carrying bla(GES-1) gene was self-transferable. Plasmid sequencing was achieved by a primer-walking approach.
The bla(GES-1) gene was located in a class 3 integron. That unusual genetic structure was itself located on an similar to 9 kb plasmid, pQ7, which was not self-transferable. Sequence analysis revealed that plasmid pQ7 belonged to a novel subtype of the IncQ group.
This study identified for the first time the bla(GES-1) gene in E. coli and in Switzerland. It describes a novel IncQ-type plasmid subgroup that possesses original features, in particular iteron sequences that constitute a hot spot for integration of foreign DNA.

• 出版日期2010-8