Genomic characterization of Staphylococcus aureus isolates causing osteoarticular infections in otherwise healthy children.

Autor: Dehority W; Department of Pediatrics, The University of New Mexico School of Medicine, Albuquerque, New Mexico, United States of America., Morley VJ; Department of Internal Medicine, The University of New Mexico School of Medicine, Center for Global Health, Albuquerque, New Mexico, United States of America., Domman DB; Department of Internal Medicine, The University of New Mexico School of Medicine, Center for Global Health, Albuquerque, New Mexico, United States of America., Daly SM; Department of Pharmaceutical Sciences, The University of New Mexico College of Pharmacy, Albuquerque, New Mexico, United States of America., Triplett KD; Department of Pharmaceutical Sciences, The University of New Mexico College of Pharmacy, Albuquerque, New Mexico, United States of America., Disch K; Department of Pediatrics, The University of New Mexico School of Medicine, Albuquerque, New Mexico, United States of America., Varjabedian R; The University of New Mexico, Albuquerque, New Mexico, United States of America., Yousey A; Department of Emergency Medicine, The University of New Mexico School of Medicine, Albuquerque, New Mexico, United States of America., Mortaji P; Department of Internal Medicine, The University of Colorado School of Medicine, Aurora, Colorado, United States of America., Hill D; The University of New Mexico Clinical and Translational Science Center, Albuquerque, New Mexico, United States of America., Oyebamiji O; Division of Molecular Medicine, The University of New Mexico, Albuquerque, New Mexico, United States of America., Guo Y; Division of Molecular Medicine, The University of New Mexico, Albuquerque, New Mexico, United States of America., Schwalm K; Department of Pediatrics, The University of New Mexico School of Medicine, Albuquerque, New Mexico, United States of America., Hall PR; Department of Pharmaceutical Sciences, The University of New Mexico College of Pharmacy, Albuquerque, New Mexico, United States of America., Dinwiddie D; Department of Pediatrics, The University of New Mexico School of Medicine, Albuquerque, New Mexico, United States of America., Femling J; Department of Emergency Medicine, The University of New Mexico School of Medicine, Albuquerque, New Mexico, United States of America.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2022 Aug 29; Vol. 17 (8), pp. e0272425. Date of Electronic Publication: 2022 Aug 29 (Print Publication: 2022).
DOI: 10.1371/journal.pone.0272425
Abstrakt: Background: Pediatric osteoarticular infections are commonly caused by Staphylococcus aureus. The contribution of S. aureus genomic variability to pathogenesis of these infections is poorly described.
Methods: We prospectively enrolled 47 children over 3 1/2 years from whom S. aureus was isolated on culture-12 uninfected with skin colonization, 16 with skin abscesses, 19 with osteoarticular infections (four with septic arthritis, three with acute osteomyelitis, six with acute osteomyelitis and septic arthritis and six with chronic osteomyelitis). Isolates underwent whole genome sequencing, with assessment for 254 virulence genes and any mutations as well as creation of a phylogenetic tree. Finally, isolates were compared for their ability to form static biofilms and compared to the genetic analysis.
Results: No sequence types predominated amongst osteoarticular infections. Only genes involved in evasion of host immune defenses were more frequently carried by isolates from osteoarticular infections than from skin colonization (p = .02). Virulence gene mutations were only noted in 14 genes (three regulating biofilm formation) when comparing isolates from subjects with osteoarticular infections and those with skin colonization. Biofilm results demonstrated large heterogeneity in the isolates' capacity to form static biofilms, with healthy control isolates producing more robust biofilm formation.
Conclusions: S. aureus causing osteoarticular infections are genetically heterogeneous, and more frequently harbor genes involved in immune evasion than less invasive isolates. However, virulence gene carriage overall is similar with infrequent mutations, suggesting that pathogenesis of S. aureus osteoarticular infections may be primarily regulated at transcriptional and/or translational levels.
Competing Interests: The authors have declared that no competing interests exist.
Databáze: MEDLINE
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