Characteristics of Virulence Factors in Methicillin-Resistant Staphylococcus aureus Strains Isolated From a Referral Hospital in Tehran, Iran

2016 ◽  
Vol 11 (1) ◽  
Author(s):  
Fateh Rahimi ◽  
Sharmin Karimi
Keyword(s):  
Staphylococcus Aureus ◽  
Virulence Factors ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Referral Hospital ◽  
Methicillin Resistant

scholarly journals Prevalence and Genetic Diversity of Staphylococcal Enterotoxin (-Like) Genes sey, selw, selx, selz, sel26 and sel27 in Community-Acquired Methicillin-Resistant Staphylococcus aureus

Toxins ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 347 ◽  
Author(s):  
Meiji Soe Aung ◽  
Noriko Urushibara ◽  
Mitsuyo Kawaguchiya ◽  
Masahiko Ito ◽  
Satoshi Habadera ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Staphylococcus Aureus ◽  
Virulence Factors ◽  
Potential Role ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Methicillin Resistant ◽  
Sequence Identity ◽  
Genetic Groups ◽  
Epidemiological Features

Staphylococcal enterotoxins (SEs) are virulence factors of Staphylococcus aureus associated with various toxic diseases due to their emetic and superantigenic activities. Although at least 27 SE(-like) genes have been identified in S. aureus to date, the newly identified SE(-like) genes have not yet been well characterized by their epidemiological features. In this study, the prevalence and genetic diversity of SE gene sey and SE-like genes selw, selx, selz, sel26, and sel27 were investigated for 624 clinical isolates of community-acquired methicillin-resistant S. aureus (CA-MRSA). The most prevalent SE(-like) gene was selw (92.9%), followed by selx (85.6%), sey (35.4%) and selz (5.6%), while sel26 and sel27 were not detected. Phylogenetically, sey, selw, selx, and selz were discriminated into 7, 10, 16, and 9 subtypes (groups), respectively. Among these subtypes, sey was the most conserved and showed the highest sequence identity (>98.8%), followed by selz and selx. The SE-like gene selw was the most divergent, and four out of ten genetic groups contained pseudogenes that may encode truncated product. Individual subtypes of SE(-like) genes were generally found in isolates with specific genotypes/lineages of S. aureus. This study revealed the putative ubiquity of selw and selx and the prevalence of sey and selz in some specific lineages (e.g., ST121) in CA-MRSA, suggesting a potential role of these newly described SEs(-like) in pathogenicity.

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