RRC ID 11461
Author Bergeron M, Dauwalder O, Gouy M, Freydiere AM, Bes M, Meugnier H, Benito Y, Etienne J, Lina G, Vandenesch F, Boisset S.
Title Species identification of staphylococci by amplification and sequencing of the tuf gene compared to the gap gene and by matrix-assisted laser desorption ionization time-of-flight mass spectrometry.
Journal Eur. J. Clin. Microbiol. Infect. Dis.
Abstract Staphylococcal species, notably, coagulase-negative staphylococci (CoNS), are frequently misidentified using phenotypic methods. The partial nucleotide sequences of the tuf and gap genes were determined in 47 reference strains to assess their suitability, practicability, and discriminatory power as target molecules for staphylococcal identification. The partial tuf gene sequence was selected and further assessed with a collection of 186 strains, including 35 species and subspecies. Then, to evaluate the efficacy of this genotyping method versus the technology of matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS), the 186 strains were identified using MALDI-TOF-MS (Axima® Shimadzu) coupled to the SARAMIS® database (AnagnosTec). The French National Reference Center for Staphylococci identification method was used as a reference. One hundred and eighty-four strains (98.9%) were correctly identified by tuf gene sequencing. Only one strain was misidentified and one was unidentified. MALDI-TOF-MS identified correctly 138 isolates (74.2%). Four strains were misidentified, 39 were unidentified, five were identified at the group (hominis/warneri) level, and one strain was identified at the genus level. These results confirm the value of MALDI-TOF-MS identification for common species in clinical laboratory practice and the value of the partial tuf gene sequence for the identification of all staphylococcal species as required in a reference laboratory.
Volume 30(3)
Pages 343-54
Published 2011-3
DOI 10.1007/s10096-010-1091-z
PMID 20967479
MeSH Bacterial Proteins / analysis Bacterial Proteins / genetics* Bacteriological Techniques* Coagulase / metabolism DNA, Bacterial / analysis* DNA, Bacterial / genetics Genes, Bacterial Genotype Phenotype Sequence Analysis, DNA Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization* Staphylococcus / classification* Staphylococcus / genetics* Staphylococcus / isolation & purification
IF 2.727
Times Cited 28
General Microbes JCM 6057 JCM 7470