Variability of Recombinase Genes and Staphylococcal Cassette Chromosome mecA of Staphylococcus Haemolyticus

Coagulase-negative staphylococci (CNS), in particular Staphylococcus haemolyticus, play an important role in the etiology of nosocomial infections. Most CNS are resistant to beta-lactam antibiotics, which is realized through the production of the second penicillin-binding protein. This protein is encoded by the mecA gene and, together with the genes of recombinases (ccr), is part of the mobile element of staphylococci - the staphylococcal cassette chromosome. During the study, the mecA and ccr genes were analyzed using a collection of 142 genomes of S.haemolyticus. The mecA gene was detected in 117 genomes (82.4%) and had a pronounced conservation. Based on the analysis of recombinase gene sequences, it was established that 118 samples (83%) contain ccr, and 22 different combinations of the mecA and recombinase genes presence are described. The combination of ccrA4B4 was the most common for S.haemolyticus (25%). Type-specific primers were proposed, to assess the variability of recombinase genes, their performance was validated on 54 clinical isolates.

S.haemolyticus, SCCmec, coagulase-negative staphylococci, S.haemolyticus, SCCmec, resistance to ß-lactam antibiotics

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