Establishment and comparison of pulsed-field gel electrophoresis, multiple-locus variable number tandem repeat analysis and automated ribotyping methods for subtyping of Citrobacter strains.
Biomed Environ Sci
; 25(6): 653-62, 2012 Dec.
Article
in En
| MEDLINE
| ID: mdl-23228835
ABSTRACT
OBJECTIVE:
To establish and compare the pulsed-field gel electrophoresis (PFGE), multiple-locus variable number tandem repeat analysis (MLVA) and automated ribotyping for subtyping of Citrobacter strains.METHODS:
PFGE protocol was optimized in terms of plug preparation procedure, restriction enzymes and configuration of electrophoretic parameters. MLVA method was evaluated by finding variable number tandem repeats in two genomes of Citrobacter strains. The ribotyping was performed by using the automated RiboPrinter system.RESULTS:
We optimized the plug preparation procedure, focused on the cell suspension concentration (turbidity of 2.5 to 3.5), SDS addition (no SDS needed) and lysis time (1 h), and selected the appropriate restriction enzyme (XbaI) and the electrophoretic parameters (1.0 s-20.0 s for 19 h) of PFGE. There was nearly no discriminatory power of MLVA between Citrobacter strains. For 51 Citrobacter strains, automated ribotyping gave a D-value of 0.9945, while PFGE gave a D-value of 0.9969. Both PFGE and automated ribotyping clustered strains from the same sources (with the same species from the same place at the same time identified as the same source) and divided strains from different sources (from different years, places and hosts) into different subtypes.CONCLUSION:
PFGE protocol established in this paper and automated ribotyping are suitable for application in Citrobacter subtyping.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Citrobacter
/
Electrophoresis, Gel, Pulsed-Field
/
Minisatellite Repeats
/
Ribotyping
/
Multilocus Sequence Typing
Type of study:
Prognostic_studies
Language:
En
Journal:
Biomed Environ Sci
Journal subject:
SAUDE AMBIENTAL
Year:
2012
Document type:
Article
Affiliation country:
China