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KMID : 0603820100160020075
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Journal of Experimental & Biomedical Science
2010 Volume.16 No. 2 p.75 ~ p.82
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Genetic Relationship between SCCmec Types and Virulence Factors of Methicillin-Resistant Staphylococcus aureus Clinical Isolates in Korea
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Lim Kwan-Hun
Lee Gyu-Sang
Park Min
Lee Jin-Hee
Suh In-Bum
Ryu Sook-Won
Eom Yong-Bin
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Abstract
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The molecular epidemiological characteristics of methicillin-resistant Staphylococcus aureus (MRSA) isolates have demonstrated their genetic diversity and evolution. A total of 137 strains of MRSA clinical isolates was collected from Korean healthcare facility in 2007. The MRSA clinical isolates were analyzed by molecular typings (SCCmec element and agr locus typing), virule nce factor gene detections {(Panton-Valentine leukocidin (PVL), enterotoxin, exfoliative toxin and toxic shock syndrome toxin-1), and amplified fragment length polymorphism (AFLP)}. The MRSA clinical isolates were classified as SCCmec type Ⅱ-agr type 1 (2 strains), type Ⅱ-agr type 2 (79 strains), type Ⅲ-agr type 1 (24 strains), type Ⅲ-agr type 2 (2 strains), type Ⅳ-agr type 1 (27 strains), type Ⅳ-agr type 2 (2 strains), and non-typable (1 strain, agr type 3). Based on SCCmec types, SCCmec type Ⅱ (95.1%) and Ⅲ (88.5%) indicated higher multidrug resistance rate than SCCmec type Ⅳ (10.3%) (P＜0.001). The most common enterotoxin genes were seg (83.8%), sei (83.1%), and sec (80.2%). The tst gene was present in 86 out of 137 (62.8%) MRSA isolates. All MRSA isolates were negative for PVL and exfoliative toxin genes. The combinations of toxin genes were observed in particular SCCmec types; 97.6% of SCCmec type Ⅱ strains carried sec, seg, sei and tst genes, 73.0% of SCCmec type Ⅲ strains carried sea gene, and 89.7% of SCCmec type IV strains carried sec, seg and sei genes. Each of the SCCmec types of MRSA isolates had distinct AFLP profile. In conclusion, SCCmec type II, agr type 1 and 2 have demonstrated to be the most common types in Korea, and the results indicated that the virulence factors are closely associated with their molecular types (SCCmec and agr types).
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KEYWORD
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MRSA, SCCmec, agr locus, Staphylococcal toxin gene, AFLP, PCR
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