Vancomycin resistance gene vanC is specific to Enterococcus gallinarum

Area of Science:

• Microbiology
• Molecular Biology
• Genetics

Background:

• Enterococcus gallinarum intrinsically exhibits low-level vancomycin resistance.
• The glycopeptide resistance gene, vanC, from E. gallinarum BM4174 has been isolated and sequenced.
• Distinguishing E. gallinarum from other vancomycin-resistant enterococci is clinically significant.

Purpose of the Study:

• To characterize the vanC gene and develop a specific probe for Enterococcus gallinarum identification.
• To assess the specificity of the vanC probe against various enterococcal species.
• To evaluate the utility of the vanC probe in differentiating E. gallinarum from other enterococci.

Main Methods:

• Cloning and sequencing of the vanC gene from E. gallinarum.
• Hybridization assays using a vanC-specific DNA probe.
• Testing probe specificity against a collection of enterococcal strains, including intrinsically and acquired vancomycin-resistant species.

Main Results:

• The vanC probe specifically hybridized with DNA fragments from 42 E. gallinarum strains.
• No homology was detected with DNA from other intrinsically vancomycin-resistant species like Enterococcus casseliflavus.
• The probe did not hybridize with DNA from enterococcal strains possessing acquired vancomycin resistance.
• The vanC probe successfully differentiated E. gallinarum from 12 other enterococcal species.

Conclusions:

• The vanC gene probe is highly specific for Enterococcus gallinarum.
• This molecular tool provides accurate species identification within the Enterococcus genus.
• The vanC probe is valuable for distinguishing E. gallinarum from other vancomycin-resistant enterococci.