Journal of Antimicrobial Chemotherapy, Vol 42, 613-619, Copyright © 1998 by The British Society for Antimicrobial Chemotherapy
VA Luna and MC Roberts
Seventy tetracycline-resistant Streptococcus pneumoniae were tested for the
presence of tetracycline resistance genes, tetM and tetO, using a
polymerase chain reaction (PCR) assay and DNA-DNA hybridization. Seven
isolates representing five serotypes (12, 22, 6A, 19F and 23) carried the
tetO gene. Five of the isolates were genetically unrelated as judged using
pulsed field gel electrophoresis (PFGE) analysis. Two 19F isolates came
from the same patient, carried both tetM and tetO genes and had the same
PFGE pattern. The other 63 isolates carried only the tetM gene. DNA
sequences from three of the tetO-carrying isolates were determined; they
showed 91-95% nucleotide sequence identity over 300 nucleotides, and 93-95%
amino acid sequence identity over 100 amino acids. The isolates carrying
both tetO and tetM genes could transfer the tetM gene into both
Enterococcus faecalis and S. pneumoniae recipients, but not the tetO gene.
There was no detectable transfer of the tetO gene, by conjugation, from the
other five isolates.
ORIGINAL ARTICLES
The presence of the tetO gene in a variety of tetracycline-resistant Streptococcus pneumoniae serotypes from Washington State
Department of Pathobiology, University of Washington, Seattle 98195, USA.
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