Journal
JOURNAL OF INFECTION
Volume 70, Issue 2, Pages 153-159Publisher
W B SAUNDERS CO LTD
DOI: 10.1016/j.jinf.2014.09.005
Keywords
Staphylococcus aureus bloodstream infection; Pacemaker; Clonal complex (CC)
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Funding
- Maria-Pesch Stiftung of the University of Cologne, Germany
- Deutsche Forschungsgemeinschaft [KA 3104/1-1]
- Paul-Ehrlich Gesellschaft fur Chemotherapie
- Bundesministerium fur Bildung und Forschung [BMBF 01KI1017]
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Objectives: Staphylococcus aureus initiates cardiac device-related infection (CDI) by binding of fibronectin binding protein A (FnBPA) to the device's surface. In FnBPA, specific binding enhancing amino acid alterations are associated with CDI. However, no study has investigated whether these mutations also occur in geographically different regions and whether they arise during infection or are inherent properties of the infecting isolate. Methods: We analysed bacterial isolates from 34 patients with S. aureus bacteraemia and implanted cardiac devices for association with CDI, FnBPA sequence, classification into a clonal complex (CC), and binding to fibronectin (Fn). Results: We confirmed that amino acid alterations at positions 652, 782, and 786 in FnBPA were associated with CDI (p = 0.005). Furthermore, CC15 and CC45 isolates were associated with CDI (p = 0.004). All isolates within a CC exhibited a characteristic mutation pattern, with major changes occurring in CC45 including a duplication of D1 and an altered immunogenic epitope in the D3 repeat. Isolates harbouring the binding enhancing mutations showed a slightly increased Fn binding capability, whereas Fn binding was decreased in CC45 isolates, according to a microtiter plate assay. Conclusions: FnBPA sequence variations are lineage specific and display inherent properties of the infecting isolate. Sequence analysis of FnBPA, as well as the bacterial genotype, may be used to predict the risk for device-related infection. (C) 2014 The British Infection Association. Published by Elsevier Ltd. All rights reserved.
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