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. 1990 Mar;28(3):489–494. doi: 10.1128/jcm.28.3.489-494.1990

Characterization of Mycobacterium paratuberculosis and organisms of the Mycobacterium avium complex by restriction polymorphism of the rRNA gene region.

R J Chiodini 1
PMCID: PMC269650  PMID: 1969866

Abstract

Nineteen Mycobacterium paratuberculosis strains, including strains of bovine, caprine, ovine, cervid, subhuman primate, and human origins, were compared with organisms of the M. avium complex by restriction fragment length polymorphism with a 5S rRNA gene probe as the reference DNA. Mycobacterial DNA was extracted, digested with several restriction enzymes, subjected to electrophoresis and Southern blotting, and then hybridized with a 5S rRNA gene probe from Escherichia coli. Hybridizing bands were visualized by autoradiography, and the sizes of the resulting rRNA fragments in kilobases were determined. Base substitutions were calculated on the basis of the number of shared fragments between species and strains. It was determined that M. paratuberculosis and the M. avium complex possess a single copy of the rRNA genes within their genomes and that the M. avium complex and M. paratuberculosis are a group of closely related organisms, likely with a common ancestral link. In proximity to the 5S rRNA gene exists a region or regions which display polymorphisms that are capable of species and subspecies differentiation. M. paratuberculosis strains isolated from humans, subhuman primates, and animals were found to be genetically identical to each other. M. paratuberculosis strains lacked the genetic heterogeneity (restriction fragment length polymorphisms) characteristic of most species, suggesting that this organism has unidirectional genetic selection. It is therefore assumed to be biologically isolated, occupying a unique and specific biological niche. This homogeneity was present in all strains, including those of animal and primate (subhuman and human) origin and strains isolated from different parts of the world.

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Selected References

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