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Del Grosso, M, Camilli, R, Barbabella, G, Blackman Northwood, J, Farrell, DJ and Pantosti, A (2011) Genetic resistance elements carrying mef subclasses other than mef(A) in Streptococcus pyogenes. Antimicrob. Agents Chemother. 55:3226-30


In Streptococcus pyogenes, efflux-mediated erythromycin resistance is associated with the mef gene, represented mostly by mef(A), although a small portion of strains carry different mef subclasses. We characterized the composite genetic elements, including mef subclasses other than mef(A), associated with other resistance genes in S. pyogenes isolates. Determination of the genetic elements was performed by PCR mapping. The strains carrying mosaic mef(A/E), in which the 5' region was identical to mef(A) and the 3' region was identical to mef(E), also carried tet(O). The two genes were found enclosed in an element similar to S. pyogenes prophage Φm46.1, designated the Φm46.1-like element. In S. pyogenes strains carrying mef(E) and tet(M), mef(E) was included in a typical mega element, and in some strains, it was physically associated with tet(M) in the composite element Tn2009. S. pyogenes strains carrying mef(I) also carried catQ; the two genes were linked in a fragment representing a portion of the 5216IQ complex of Streptococcus pneumoniae, designated the defective IQ element. In the only isolate carrying a novel mef gene, this was associated with catQ and tet(M) in a genetic element similar to the 5216IQ complex of S. pneumoniae (5216IQ-like complex), suggesting that the novel mef is in fact a variant of mef(I). This study demonstrates that the composite elements containing mef are shared between S. pyogenes and S. pneumoniae and suggests that it is important to distinguish the mef subclass on the basis of the genetic element containing it.


PubMed PMC3122394 Online version:10.1128/AAC.01713-10


Anti-Bacterial Agents/pharmacology; Bacterial Proteins/genetics; Chloramphenicol/pharmacology; Drug Resistance, Multiple, Bacterial/genetics; Erythromycin/pharmacology; Microbial Sensitivity Tests; Polymerase Chain Reaction; Streptococcus pyogenes/drug effects; Streptococcus pyogenes/genetics; Tetracycline Resistance/genetics



Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status


GO:0010467: gene expression



Table 1 shows the strains and their resistance genes. Within the results it states that the mef(A/E) carried tet(O).

CACAO 11308


GO:0010467: gene expression



Table 1 shows the strains and their resistance genes. The conclusion paragraph states that the mefA are apart of the resistant genes and similar to those already identified with S. pyogenes or S. pneumoniae.

CACAO 11350


See also


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