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Appl. Environ. Microbiol., 09 1997, 3405-3411, Vol 63, No. 9
KP Scott, TM Barbosa, KJ Forbes and HJ Flint
Butyrivibrio fibrisolvens strains resistant to tetracycline were isolated
from the bovine rumen. Two of three Tcr B. fibrisolvens tested were able to
donate tetracycline resistance at frequencies ranging from 10(-7) to 10(-1)
per donor cell in anaerobic filter matings to a rifampin-resistant mutant
of the type strain of B.fibrisolvens, 2221R. The recipient strain 2221R
exhibited rapid autoaggregation, which might be a factor in the high
transfer rates observed. Tcr transconjugants of B. fibrisolvens 2221R were
also capable of further transferring tetracycline resistance to a fusidic
acid-resistant mutant, 2221F. Comparison of genomic DNAs by pulsed-field
gel electrophoresis demonstrated altered band profiles in transconjugants,
consistent with the acquisition of a large mobile chromosomal element. The
transferable elements from the two B. fibrisolvens donors 1.23 and 1.230
(TnB123 and TnB1230, respectively) showed the same preferred insertion site
in the B. fibrisolvens 2221R chromosome and are likely to be similar, or
identical, elements. Hybridization experiments showed no close relationship
between TnB1230 and int-xis regions from Tn916 or Tn5253. Although DNA from
the B. fibrisolvens donor strains hybridized with probes carrying tet(M) or
tet(O) sequences, transconjugants were found to have acquired a distinct
band that hybridized only weakly with these probes, suggesting that a
second, distantly related Tcr determinant had been transferred.
Copyright © 1997, American Society for Microbiology
High-frequency transfer of a naturally occurring chromosomal tetracycline resistance element in the ruminal anaerobe Butyrivibrio fibrisolvens
Rowett Research Institute, University of Aberdeen, United Kingdom.
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