biostudies-literatureUnknown19(7)Yousuf BCanadian Blood ServicesHealth CanadaStaphylococcus aureus is a well-documented bacterial contaminant in platelet concentrates (PCs), a blood component used to treat patients with platelet deficiencies. This bacterium can evade routine PC culture screening and cause septic transfusion reactions. Here, we investigated the gene expression modulation within the PC niche versus trypticase soy media (TSB) of S. aureus CBS2016-05, a strain isolated from a septic reaction, in comparison to PS/BAC/317/16/W, a strain identified during PC screening. RNA-seq analysis revealed upregulation of the capsule biosynthesis operon (capA-H), surface adhesion factors (sasADF), clumping factor A (clfA), protein A (spa), and anaerobic metabolism genes (pflAB, nrdDG) in CBS2016-05 when grown in PCs versus TSB, implying its enhanced pathogenicity in PloS onee0307920https://www.ebi.ac.uk/biostudies/studies/S-EPMC11271859biostudies-literatureModulation of Staphylococcus aureus gene expression during proliferation in platelet concentrates with focus on virulence and platelet functionality.PMC11271859Pasha RRamirez-Arcos SYousuf BPineault NfalseModulation of Staphylococcus aureus gene expression during proliferation in platelet concentrates with focus on virulence and platelet functionality.Staphylococcus aureus is a well-documented bacterial contaminant in platelet concentrates (PCs), a blood component used to treat patients with platelet deficiencies. This bacterium can evade routine PC culture screening and cause septic transfusion reactions. Here, we investigated the gene expression modulation within the PC niche versus trypticase soy media (TSB) of S. aureus CBS2016-05, a strain isolated from a septic reaction, in comparison to PS/BAC/317/16/W, a strain identified during PC screening. RNA-seq analysis revealed upregulation of the capsule biosynthesis operon (capA-H), surface adhesion factors (sasADF), clumping factor A (clfA), protein A (spa), and anaerobic metabolism genes (pflAB, nrdDG) in CBS2016-05 when grown in PCs versus TSB, implying its enhanced pathogenicity in 2024-01-01T00:00:00Z20242026-06-02T23:35:01.561Z2025-04-19T13:11:38.376ZS-EPMC112718593905266010.1371/journal.pone.0307920