Molecular Identification of icaA, icaB, icaC and icaD Genes in Staphylococcus aureus Clinical Isolates Resistant to Methicillin

Mahdavi, Fatemeh; Amoli, Rabieh Izadi; Oskooeian, Roghaye

doi:10.29252/aums.8.3.245

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Biofilm formation is highly associated with the expression of ica genes and a study has shown that ica -positive MRSA biofilms create thicker biofilms with a more compact architecture than ica -negative isolates using CLSM analysis, which is accordance with our results [ 37 ]. Other studies had ica genes frequencies in clinical MRSA isolates similar to ours [ 26 , 38 ]. In all of our isolates, the fnbB gene was less frequently detected than fnbA .…”

Section: Discussionsupporting

confidence: 82%

Biofilm Formation of Multidrug-Resistant MRSA Strains Isolated from Different Types of Human Infections

et al. 2021

View full text Add to dashboard Cite

Methicillin-resistant Staphylococcus aureus (MRSA) is one of the main pathogens causing chronic infections, mainly due to its capacity to form biofilms. However, the mechanisms underlying the biofilm formation of MRSA strains from different types of human infections are not fully understood. MRSA strains isolated from distinct human infections were characterized aiming to determine their biofilm-forming capacity, the biofilm resistance to conventional antibiotics and the prevalence of biofilm-related genes, including, icaA, icaB, icaC, icaD, fnbA, fnbB, clfA, clfB, cna, eno, ebpS, fib and bbp. Eighty-three clinical MRSA strains recovered from bacteremia episodes, osteomyelitis and diabetic foot ulcers were used. The biofilm-forming capacity was evaluated by the microtiter biofilm assay and the biofilm structure was analyzed via confocal scanning laser microscopy. The antimicrobial susceptibility of 24-h-old biofilms was assessed against three antibiotics and the biomass reduction was measured. The metabolic activity of biofilms was evaluated by the XTT assay. The presence of biofilm-related genes was investigated by whole-genome sequencing and by PCR. Despite different intensities, all strains showed the capacity to form biofilms. Most strains had also a large number of biofilm-related genes. However, strains isolated from osteomyelitis showed a lower capacity to form biofilms and also a lower prevalence of biofilm-associated genes. There was a significant reduction in the biofilm biomass of some strains tested against antibiotics. Our results provide important information on the biofilm-forming capacity of clinical MRSA strains, which may be essential to understand the influence of different types of infections on biofilm production and chronic infections.

show abstract

Section: Discussionsupporting

confidence: 82%