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The role of mecA and blaZ regulatory elements in mecA expression by regional clones of methicillin-resistant Staphylococcus pseudintermedius.
Vet Microbiol. 2011 Aug 05; 151(3-4):345-53.VM

Abstract

Two major regional clones of methicillin-resistant Staphylococcus pseudintermedius (MRSP) have been identified in Europe and North America. They are designated multilocus sequence types (ST) 71 and 68 and contain staphylococcal chromosome cassette (SCCmec) types II-III and V(T), respectively. One notable difference between the two clones is a deletion in the mecI/mecR1 regulatory apparatus of ST 68 SCCmec V(T). This deletion in analogous methicillin-resistant Staphylococcus aureus (MRSA) results in more responsive and greater expression of the mecA encoded penicillin-binding protein 2a, and is associated with SCCmec types occurring in community-acquired MRSA lineages. The aim of this study was to characterize mec and bla regulatory apparatuses in MRSP and determine their effects on expression of mecA. Seventeen S. pseudintermedius isolates representing nine methicillin-resistant ST lineages were screened for the presence of the repressors blaI and mecI and sensors blaR1 and mecR1. The bla and mec operons for each isolate were sequenced and compared for homology between the repressor open-reading frames (ORF), sensor ORFs, and mecA promoter regions. A real-time reverse transcriptase PCR expression assay was developed, validated and applied to nine isolates determining the effect of oxacillin induction on mecA transcription. Significant differences were found in mecA expression between isolates with a full regulatory complement (mecI/mecR1 and blaI/blaR1) and those with truncated and/or absent regulatory elements. Isolates representative of European and North American MRSP ST regional clones have dissimilar mecA responses to oxacillin.

Authors+Show Affiliations

Department of Comparative Medicine, College of Veterinary Medicine, University of Tennessee, 2407 River Drive, Knoxville, TN 37996, United States.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21514752

Citation

Black, C C., et al. "The Role of mecA and blaZ Regulatory Elements in mecA Expression By Regional Clones of Methicillin-resistant Staphylococcus Pseudintermedius." Veterinary Microbiology, vol. 151, no. 3-4, 2011, pp. 345-53.
Black CC, Eberlein LC, Solyman SM, et al. The role of mecA and blaZ regulatory elements in mecA expression by regional clones of methicillin-resistant Staphylococcus pseudintermedius. Vet Microbiol. 2011;151(3-4):345-53.
Black, C. C., Eberlein, L. C., Solyman, S. M., Wilkes, R. P., Hartmann, F. A., Rohrbach, B. W., Bemis, D. A., & Kania, S. A. (2011). The role of mecA and blaZ regulatory elements in mecA expression by regional clones of methicillin-resistant Staphylococcus pseudintermedius. Veterinary Microbiology, 151(3-4), 345-53. https://doi.org/10.1016/j.vetmic.2011.03.026
Black CC, et al. The Role of mecA and blaZ Regulatory Elements in mecA Expression By Regional Clones of Methicillin-resistant Staphylococcus Pseudintermedius. Vet Microbiol. 2011 Aug 5;151(3-4):345-53. PubMed PMID: 21514752.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The role of mecA and blaZ regulatory elements in mecA expression by regional clones of methicillin-resistant Staphylococcus pseudintermedius. AU - Black,C C, AU - Eberlein,L C, AU - Solyman,S M, AU - Wilkes,R P, AU - Hartmann,F A, AU - Rohrbach,B W, AU - Bemis,D A, AU - Kania,S A, Y1 - 2011/03/30/ PY - 2011/01/04/received PY - 2011/03/03/revised PY - 2011/03/23/accepted PY - 2011/4/26/entrez PY - 2011/4/26/pubmed PY - 2011/10/19/medline SP - 345 EP - 53 JF - Veterinary microbiology JO - Vet Microbiol VL - 151 IS - 3-4 N2 - Two major regional clones of methicillin-resistant Staphylococcus pseudintermedius (MRSP) have been identified in Europe and North America. They are designated multilocus sequence types (ST) 71 and 68 and contain staphylococcal chromosome cassette (SCCmec) types II-III and V(T), respectively. One notable difference between the two clones is a deletion in the mecI/mecR1 regulatory apparatus of ST 68 SCCmec V(T). This deletion in analogous methicillin-resistant Staphylococcus aureus (MRSA) results in more responsive and greater expression of the mecA encoded penicillin-binding protein 2a, and is associated with SCCmec types occurring in community-acquired MRSA lineages. The aim of this study was to characterize mec and bla regulatory apparatuses in MRSP and determine their effects on expression of mecA. Seventeen S. pseudintermedius isolates representing nine methicillin-resistant ST lineages were screened for the presence of the repressors blaI and mecI and sensors blaR1 and mecR1. The bla and mec operons for each isolate were sequenced and compared for homology between the repressor open-reading frames (ORF), sensor ORFs, and mecA promoter regions. A real-time reverse transcriptase PCR expression assay was developed, validated and applied to nine isolates determining the effect of oxacillin induction on mecA transcription. Significant differences were found in mecA expression between isolates with a full regulatory complement (mecI/mecR1 and blaI/blaR1) and those with truncated and/or absent regulatory elements. Isolates representative of European and North American MRSP ST regional clones have dissimilar mecA responses to oxacillin. SN - 1873-2542 UR - https://www.unboundmedicine.com/medline/citation/21514752/The_role_of_mecA_and_blaZ_regulatory_elements_in_mecA_expression_by_regional_clones_of_methicillin_resistant_Staphylococcus_pseudintermedius_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0378-1135(11)00181-7 DB - PRIME DP - Unbound Medicine ER -