Prevalence of adhesion and regulation of biofilm-related genes in different clones of Staphylococcus aureus.
Clinical information about genotypically different clones of biofilm-producing Staphylococcus aureus is largely unknown. We examined whether different clones of methicillin-sensitive and methicillin-resistant S. aureus (MSSA and MRSA) differ with respect to staphylococcal microbial surface components recognizing adhesive matrix molecules (MSCRAMMs) in biofilm formation. The study used 60 different types of spa and determined the phenotypes, the prevalence of the 13 MSCRAMM, and biofilm genes for each clone. The current investigation was carried out using a modified Congo red agar (MCRA), a microtiter plate assay (MPA), polymerase chain reaction (PCR), and reverse transcriptase polymerase chain reaction (RT-PCR). Clones belonging to the same spa type were found to have similar properties in adheringto the polystyrene microtiter plate surface. However, their ability to produce slime on MCRA medium was different. PCR experiments showed that 60 clones of MSSA and MRSA were positive for 5 genes (out of 9 MSCRAMM genes). icaADBC genes were found to be present in all the 60 clones tested indicating a high prevalence, and these genes were equally distributed among the clones associated with MSSA and those with MRSA. The prevalence of other MSCRAMM genes among MSSA and MRSA clones was found to be variable. MRSA and MSSA gene expression (MSCRAMM and icaADBC) was confirmed by RT-PCR.
Laboratory of Medical Microbiology and Parasitology, Faculty of Medicine and Health Science, Universiti Putra Malaysia, Selangor 43400 Serdang, Malaysia. salmanatshan@yahoo.com
Salman Sahab
SS
Atshan
Mariana
M
Nor Shamsudin
Zamberi
Z
Sekawi
Leslie Than Thian
LT
Lung
Rukman Awang
RA
Hamat
Arunkumar
A
Karunanidhi
Alreshidi
A
Mateg Ali
Ehsanollah
E
Ghaznavi-Rad
Hamed
H
Ghasemzadeh-Moghaddam
Johnson Shueh
JS
Chong Seng
Jayakayatri Jeevajothi
JJ
Nathan
Chong Pei
CP
Pei
D015373:Bacterial Typing Techniques; D018441:Biofilms / Q000254:growth & development*; D002448:Cell Adhesion / Q000235:genetics*; D006801:Humans; D055624:Methicillin-Resistant Staphylococcus aureus / Q000235:genetics* / Q000254:growth & development / Q000472:pathogenicity; D008826:Microbial Sensitivity Tests; D015995:Prevalence; D013203:Staphylococcal Infections