NDLI: A Second Tylosin Resistance Determinant, Erm B, in Arcanobacterium pyogenes

Content Provider	PubMed Central
Author	Jost, B. Helen Trinh, Hien T. Songer, J. Glenn Billington, Stephen J.
Copyright Year	2004
Abstract	Arcanobacterium pyogenes, a common inhabitant of the mucosal surfaces of livestock, is also a pathogen associated with a variety of infections. In livestock, A. pyogenes is exposed to antimicrobial agents used for prophylaxis and therapy, notably tylosin, a macrolide used extensively for the prevention of liver abscessation in feedlot cattle in the United States. Many, but not all, tylosin-resistant A. pyogenes isolates carry erm(X), suggesting the presence of other determinants of tylosin resistance. Oligonucleotide primers designed for conserved regions of erm(B), erm(C), and erm(T) were used to amplify a 404-bp fragment from a tylosin-resistant A. pyogenes isolate, OX-7. DNA sequencing revealed that the PCR product was 100% identical to erm(B) genes, and the erm(B) gene region was cloned in Escherichia coli. The A. pyogenes Erm B determinant had the most DNA identity with an Erm B determinant carried by the Clostridium perfringens plasmid pIP402. However, the A. pyogenes determinant lacked direct repeat DR1 and contained a deletion in DR2. Flanking the A. pyogenes erm(B) gene were partial and entire genes similar to those found on the Enterococcus faecalis multiresistance plasmid pRE25. This novel architecture suggests that the erm(B) element may have arisen by recombination of two distinct genetic elements. Ten of 32 tylosin-resistant isolates carried erm(B), as determined by DNA hybridization, and all 10 isolates carried a similar element. Insertion of the element was site specific, as PCR and Southern blotting analysis revealed that the erm(B) element was inserted into orfY, a gene of unknown function. However, in three strains, this insertion resulted in a partial duplication of orfY.
Related Links	http://dx.doi.org/10.1128/aac.48.3.721-727.2004
Ending Page	727
Page Count	7
Starting Page	721
File Format	PDF
ISSN	00664804
e-ISSN	10986596
Journal	Antimicrobial Agents and Chemotherapy
Issue Number	3
Volume Number	48
Language	English
Publisher	American Society for Microbiology
Publisher Date	2004-03-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Pharmacology (medical) Pharmacology Infectious Diseases Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Pharmacology Pharmacology (medical)

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