vanD and vanG-like gene clusters in a Ruminococcus species isolated from human bowel flora.

Abstract:

:A vancomycin-resistant, anaerobic, gram-positive coccus containing the vanD and vanG-like genes (strain CCRI-16110) was isolated from a human fecal specimen during a hospital surveillance program to detect carriers of vancomycin-resistant enterococci. Comparison of the 16S rRNA gene sequence of strain CCRI-16110 with databases revealed a potentially novel Ruminococcus species that was most similar (<94% identity) to Clostridium and Ruminococcus species. Strain CCRI-16110 was highly resistant to vancomycin and teicoplanin (MICs of >256 microg/ml). The complete DNA sequence of the vanD cluster was most similar (98.2% identity) to that of Enterococcus faecium BM4339, containing the vanD1 allele. An intD gene with 99% identity with that of this E. faecium strain was found to be associated with the vanD gene cluster of this novel anaerobic bacterium. Strain CCRI-16110 also harbors genes encoding putative VanS(G), VanG, and VanT(G) proteins displaying 56, 73.6, and 55% amino acid sequence identity, respectively, compared to the corresponding proteins encoded by the vanG1 and vanG2 operons of Enterococcus faecalis BM4518 and N03-0233. This study reports for the first time an anaerobic bacterium containing the vanD gene cluster. This strain also harbors a partial vanG-like gene cluster. The presence of vanD- and vanG-containing anaerobic bacteria in the human bowel flora suggests that these bacteria may serve as a reservoir for the vanD and vanG vancomycin resistance genes.

authors

Domingo MC,Huletsky A,Giroux R,Picard FJ,Bergeron MG

doi

10.1128/AAC.00584-07

subject

Has Abstract

pub_date

2007-11-01 00:00:00

pages

4111-7

issue

11

eissn

0066-4804

issn

1098-6596

pii

AAC.00584-07

journal_volume

51

pub_type

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