Origin and Evolution of European Community-Acquired Methicillin- Resistant Staphylococcus aureus

Marc Stegger, Thierry Wirth, Paal S. Andersen, Robert L. Skov, Anna De Grassi, Patricia Martins Simões, Anne Tristan, Andreas Petersen, Maliha Aziz, Kristoffer Kiil, Ivana Cirkovic, Edet E. Udo, Rosa del Campo, Jaana Vuopio-Varkila, Norazah Ahmad, Sima Tokajian, Georg Peters, Frieder Schaumburg, Barbro Olsson-Liljequist, Michael GivskovElizabeth E. Driebe, Henrik Erdman Vigh, Adebayo Shittu, Nadjia Ramdani-Bougessa, Jean-Philippe Rasigade, Lance B. Price, Francois Vandenesch, Anders R. Larsen, Frederic Laurent

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    Abstract

    Community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) was recognized in Europe and worldwide in the late 1990s. Within a decade, several genetically and geographically distinct CA-MRSA lineages carrying the small SCCmec type IV and V genetic elements and the Panton-Valentine leukocidin (PVL) emerged around the world. In Europe, the predominant CA-MRSA strain belongs to clonal complex 80 (CC80) and is resistant to kanamycin/amikacin and fusidic acid. CC80 was first reported in 1993 but was relatively rare until the late 1990s. It has since been identified throughout North Africa, the Middle East, and Europe, with recent sporadic reports in sub-Saharan Africa. While strongly associated with skin and soft tissue infections, it is rarely found among asymptomatic carriers. Methicillin-sensitive S. aureus (MSSA) CC80 strains are extremely rare except in sub-Saharan Africa. In the current study, we applied whole-genome sequencing to a global collection of both MSSA and MRSA CC80 isolates. Phylogenetic analyses strongly suggest that the European epidemic CA-MRSA lineage is derived from a PVL-positive MSSA ancestor from sub-Saharan Africa. Moreover, the tree topology suggests a single acquisition of both the SCCmec element and a plasmid encoding the fusidic acid resistance determinant. Four canonical SNPs distinguish the derived CA-MRSA lineage and include a nonsynonymous mutation in accessory gene regulator C (agrC). These changes were associated with a star-like expansion into Europe, the Middle East, and North Africa in the early 1990s, including multiple cases of cross-continent imports likely driven by human migrations.

    IMPORTANCE: With increasing levels of CA-MRSA reported from most parts of the Western world, there is a great interest in understanding the origin and factors associated with the emergence of these epidemic lineages. To trace the origin, evolution, and dissemination pattern of the European CA-MRSA clone (CC80), we sequenced a global collection of strains of the S. aureus CC80 lineage. Our study determined that a single descendant of a PVL-positive methicillin-sensitive ancestor circulating in sub-Saharan Africa rose to become the dominant CA-MRSA clone in Europe, the Middle East, and North Africa. In the transition from a methicillin-susceptible lineage to a successful CA-MRSA clone, it simultaneously became resistant to fusidic acid, a widely used antibiotic for skin and soft tissue infections, thus demonstrating the importance of antibiotic selection in the success of this clone. This finding furthermore highlights the significance of horizontal gene acquisitions and underscores the combined importance of these factors for the success of CA-MRSA.

    Original languageEnglish
    Article numbere01044-14
    JournalmBio (Print)
    Volume5
    Issue number5
    Pages (from-to)1-12
    Number of pages12
    ISSN2161-2129
    DOIs
    Publication statusPublished - 26 Aug 2014

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