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The evolutionary pathway of the staphylococcal cassette chromosome element

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Abstract

The staphylococcal cassette chromosome (SCC) element can carry resistance genes to antibiotics, disinfectants, and heavy metals, contributing to the survival of strains in the environment and causing difficulties in the treatment of staphylococcal infections. Methicillin resistance in staphylococci, which is of particular clinical significance, is encoded by staphylococcal cassette chromosome mec (SCCmec). Despite the importance of the SCC element and description of multiple nucleotide sequences, the information about its origin and evolution is still scarce. Here, we present a phylogenetic analysis of SCC elements that is unique in the use of whole SCC sequences. A phylogenetic tree for a noteworthy number of 81 SCC elements based on global sequence alignment was constructed. The SCC clustering did not reflect the genetic relationships of bacteria containing the SCC elements, but was done according to type, determined by the combination of mec gene complex class and ccr gene complex type. The results emphasise the horizontal gene transfer as a means of spread of SCC elements in bacterial strains. Overall, this study contributes to the understanding of SCC emergence, evolution, and dissemination.

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Abbreviations

ACME:

arginine catabolic mobile element

CA-MRSA:

community-acquired methicillin-resistant Staphylococcus aureus

CC:

clonal complex ccr, chromosome cassette recombinase

CoNS:

coagulase-negative staphylococci

HAMRSA:

hospital-acquired methicillin-resistant Staphylococcus aureus

HGT:

horizontal gene transfer

LCB:

locally collinear block

MGE:

mobile genetic element

MLST:

multilocus sequence typing

MRSA:

methicillin-resistant Staphylococcus aureus

MSSA:

methicillin-susceptible Staphylococcus aureus

SCC:

staphylococcal cassette chromosome

SCCmec:

staphylococcal cassette chromosome mec

ST:

sequence type

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Acknowledgements

This work was supported by a grant from the Czech Science Foundation (GP13-05069P). Access to computing and storage facilities owned by parties and projects contributing to the National Grid Infrastructure MetaCentrum, provided under the programme “Projects of Large Infrastructure for Research, Development, and Innovations” (LM2010005), is greatly appreciated. We thank Eva Kodytková for her valuable help with this manuscript.

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Indráková, A., Mašlaňová, I., Kováčová, V. et al. The evolutionary pathway of the staphylococcal cassette chromosome element. Biologia 71, 1195–1203 (2016). https://doi.org/10.1515/biolog-2016-0156

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