Abstract
Data presented in this study show a high prevalence of diverse ISs within the M. bovis rrn locus resulting in intraspecies variability and diversity. Such abundance of IS elements near or within the rrn locus may offer a selective advantage to M. bovis Moreover, the fact that expression of the rrs genes as well as the number of viable cells increased in the group of strains with IS element insertion within a putative promoter -35 sequence (configuration F) in comparison to that in strains with one or two rrn operons that do not have ISs may serve as a basis for understanding the possible role of M. bovis IS elements in fundamental biological processes such as regulation of ribosome synthesis and function.
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