title: Molecular ecology of macrolide-lincosamide-streptogramin B methylases in waste lagoons and subsurface waters associated with swine production.
abstract: RNA methylase genes are common antibiotic resistance determinants for multiple drugs of the macrolide, lincosamide, and streptogramin B (MLS(B)) families. We used molecular methods to investigate the diversity, distribution, and abundance of MLS(B) methylases in waste lagoons and groundwater wells at two swine farms with a history of tylosin (a macrolide antibiotic structurally related to erythromycin) and tetracycline usage. Phylogenetic analysis guided primer design for quantification of MLS(B) resistance genes found in tylosin-producing Streptomyces (tlr(B), tlr(D)) and commensal/pathogenic bacteria (erm(A), erm(B), erm(C), erm(F), erm(G), erm(Q)). The near absence of tlr genes at these sites suggested a lack of native antibiotic-producing organisms. The gene combination erm(ABCF) was found in all lagoon samples analyzed. These four genes were also detected with high frequency in wells previously found to be contaminated by lagoon leakage. A weak correlation was found between the distribution of erm genes and previously reported patterns of tetracycline resistance determinants, suggesting that dissemination of these genes into the environment is not necessarily linked. Considerations of gene origins in history (i.e., phylogeny) and gene distributions in the landscape provide a useful "molecular ecology" framework for studying environmental spread of antibiotic resistance.
authors.affiliation: Department of Animal Sciences, University of Illinois at Urbana-Champaign, 1207 W. Gregory Dr., Urbana, IL 61801, USA.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Koike
authors.forename: Rustam I
authors.initials: RI
authors.lastname: Aminov
authors.forename: A C
authors.initials: AC
authors.lastname: Yannarell
authors.forename: Holly D
authors.initials: HD
authors.lastname: Gans
authors.forename: Ivan G
authors.initials: IG
authors.lastname: Krapac
authors.forename: Joanne C
authors.initials: JC
authors.lastname: Chee-Sanford
authors.forename: Roderick I
authors.initials: RI
authors.lastname: Mackie
mesh_terms: D000818:Animals; D017931:DNA Primers; D004269:DNA, Bacterial / Q000235:genetics; D024901:Drug Resistance, Multiple, Bacterial / Q000235:genetics; D005618:Fresh Water / Q000382:microbiology*; D005798:Genes, Bacterial; D055231:Lincosamides / Q000494:pharmacology; D018942:Macrolides / Q000494:pharmacology; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D025381:Streptogramin B / Q000494:pharmacology; D013302:Streptomyces / Q000187:drug effects / Q000201:enzymology* / Q000235:genetics; D013552:Swine; D013753:Tetracycline Resistance; D014865:Waste Disposal, Fluid; D014871:Water Microbiology; D012359:tRNA Methyltransferases / Q000235:genetics / Q000302:isolation & purification*
chemical_list: D017931:DNA Primers; D004269:DNA, Bacterial; D055231:Lincosamides; D018942:Macrolides; D025381:Streptogramin B; D012359:tRNA Methyltransferases