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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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The tetracycline resistance gene tet(M) exhibits mosaic structure.

Tetracycline resistance genes of the M class, tet(M), are typically found on mobile genetic elements as the conjugative transposons of gram-positive bacteria. By comparing the sequences of eight different tet(M) genes (from Enterococcus faecalis, Streptococcus pneumoniae, Staphylococcus aureus, Ureaplasma urealyticum, and Neisseria), a mosaic structure was detected which could be traced to two distinct alleles. The two alleles displayed a divergence of 8% and a different G/C content. The block structure of these genes provides evidence for the contribution of homologous recombination to the evolution and the heterogeneity of the tet(M) locus. Unlike described cases of chromosomally located mosaic loci, tet(M) is a relatively recently acquired determinant in the species examined and it would appear that mosaic structure within tet(M) has evolved after acquisition of the gene by the mobile genetic elements upon which it is located.[1]

References

  1. The tetracycline resistance gene tet(M) exhibits mosaic structure. Oggioni, M.R., Dowson, C.G., Smith, J.M., Provvedi, R., Pozzi, G. Plasmid (1996) [Pubmed]
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