The alarming coincidence of toxin genes with staphylococcal cassette Chromosome mec (SCCmec) in clinical MRSA isolates

Faculty Pharmacy Year: 2025
Type of Publication: ZU Hosted Pages:
Authors:
Journal: Saudi Journal of Biological Sciences sciencedirect Volume:
Keywords : , alarming coincidence , toxin genes with staphylococcal    
Abstract:
Staphylococcus aureus is an opportunistic pathogen causing infections with high morbidity and mortality. MRSA isolates which harbor Staphylococcal Cassette Chromosome mec (SCCmec) and express various types of toxins are the most serious strains. Type of SCCmec and common toxin genes (TGs) among MRSA isolates were investigated in the current study. SCCmec and TGs were detected by multiplex-PCR. Possible correlations between SCCmec and TGs were elucidated statistically using IBM-SPSS software. Staphylococcus-enterotoxins (SEs) were sequenced to investigate their genetic relatedness using Sanger-sequencing, and MEGAX software. MRSA were detected in 124 isolates, 67 of MRSA isolates (54 %) were harboring a single SCCmec with 40, 21, 5 and 1 isolate for SCCmec II, SCCmec III, SCCmec IV, and SCCmec V, respectively. Furthermore, Four isolates (3.2 %) had both SCCmec II and SCCmec IV. The highest incidence of TGs was recorded for sea (40.3%) and etb (34.6%) genes. Statistically, moderate correlation between toxins and SCCmec type and between presence of toxin genes and severity of infections were detected. All SEs sequences were correlated, sea and see genes were more conserved. Isolates from serious cases revealed different degrees of nucleotide and amino acid substitution among seb, sec, and tsst genes, which might contribute to their increased virulence. This study improves our understanding of S. aureus toxin profile in relation to SCCmec type, and highlight their possible roles in virulence
   
     
 
       

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