Multiplex PCR strategy for rapid identification of structural types and variants of the mec element in methicillin-resistant Staphylococcus aureus - PubMed (original) (raw)
Multiplex PCR strategy for rapid identification of structural types and variants of the mec element in methicillin-resistant Staphylococcus aureus
Duarte C Oliveira et al. Antimicrob Agents Chemother. 2002 Jul.
Abstract
Full characterization of methicillin-resistant Staphylococcus aureus (MRSA) requires definition of not only the bacterial genetic background but also the structure of the complex and heterologous mec element these bacteria carry, which is associated with drug resistance determinant mecA. We report the development, validation, and application of a multiplex PCR strategy that allows quick presumptive characterization of the mec element types based on the structural features that were shown to be typical of mec elements carried by several MRSA clones. The strategy was validated by using a representative collection of pandemic MRSA clones in which the full structure of the associated mec elements was previously determined by hybridization and PCR screenings and also by DNA sequencing. The method was tested together with multilocus sequence typing and other typing methods for the characterization of 18 isolates representative of the MRSA clones recovered during a hospital outbreak in Barcelona, Spain. The multiplex PCR was shown to be rapid, robust, and capable in a single assay of identifying five structural types of the mec element among these strains, three major and two minor variants, each one of which has been already been seen among MRSA characterized earlier. This technique should be a useful addition to the armamentarium of molecular typing tools for the characterization of MRSA clonal types and for the rapid tentative identification of structural variants of the mec element.
Figures
FIG. 1.
Validation of the SCC_mec_ multiplex PCR strategy. Major SCC_mec_ types are given at the bottom. (A) SCC_mec_ type I (lanes 1 to 4 and 8), variant IA (lanes 5 to 7 and 9), and SCC_mec_ type II (lanes 10 to 12). (B) SCC_mec_ type III (lanes 1, 2, 6, and 7), variant IIIA (lanes 3 and 4), and variant IIIB (lane 5). (C) SCC_mec_ type IV. Lane numbers are correlated with the order of strains (from top to bottom) in Table 1 (e.g., panel A, lane 1 represents strain UK13136 and panel B, lane 1 represents strain ANS46). M, DNA molecular size marker (1-kb DNA Ladder Plus; Gibco BRL, Invitrogen Corporation).
FIG. 2.
Application of the SCC_mec_ multiplex PCR strategy to an outbreak collection including the sporadic clones. Lanes 1 to 9, PFGE patterns A1, A2, B1 to B6, and B8, respectively; lane 10, pattern C; lanes 11 to 16, patterns E through J, respectively. M, DNA molecular size marker (1-kb DNA Ladder Plus).
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