We compared the propensities of Enterococcus faecalis JH2-2 and of the recombination-deficient JH2-2 recA strain to develop mutational resistance to linezolid. In both organisms, a mutation in a single rrl copy conferred resistance to linezolid. Delay in acquisition of the mutation by other rrl copies in JH2-2 recA showed that gene conversion contributed to the acquisition of resistance.
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Boumghar-Bourtchaï et al. (2009) studied this question.
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