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SCCmec, or staphylococcal cassette chromosome mec, is a mobile genetic element of Staphylococcus bacterial species. This genetic sequence includes the mecA gene coding for resistance to the antibiotic methicillin and is the only known way for Staphylococcus strains to spread the gene in the wild by horizontal gene transfer. [1]
Download as PDF; Printable version; In other projects ... Meca or MECA may refer to: Biology. mecA, responsible for methicillin resistance in MRSA; Meca, a snout moth ...
The mecA gene, which confers resistance to a number of antibiotics, is always present in MRSA and usually absent in MSSA; however, in some instances, the mecA gene is present in MSSA but is not expressed. Polymerase chain reaction (PCR) testing is the most precise method for identifying MRSA strains. Specialized culture media have been ...
Resistance to methicillin is conferred by activation of a new bacterial penicillin binding protein (PBP) mecA gene. This encodes protein PBP2a. This encodes protein PBP2a. PBP2a works in a similar manner to other PBPs, but it binds β-lactams with very low affinity, meaning they do not compete efficiently with the natural substrate of the ...
Genetic testing, such as via polymerase chain reaction (PCR), DNA microarray, and loop-mediated isothermal amplification, may be used to detect whether bacteria possess genes which confer antibiotic resistance. [9] [23] An example is the use of PCR to detect the mecA gene for beta-lactam resistant Staphylococcus aureus. [9]
In this technology, conventional antibiotic resistance gene is replaced by ccdA in the plasmid while ccdB gene is introduced into the chromosome of the bacteria. This technology allows to remove antibiotic resistance gene but is also able to reach higher yields in recombinant protein production and plasmid DNA. [8]
The diagnosis of vancomycin-resistant Staphylococcus aureus (VRSA) is performed by performing susceptibility testing on a single S. aureus isolate to vancomycin. This is accomplished by first assessing the isolate's minimum inhibitory concentration (MIC) using standard laboratory methods, including disc diffusion, gradient strip diffusion, and automated antimicrobial susceptibility testing ...
Antimicrobial resistance means a microorganism's resistance to an antimicrobial drug that was once able to treat an infection by that microorganism. [3] A person cannot become resistant to antibiotics. Resistance is a property of the microbe, not a person or other organism infected by a microbe. [14] All types of microbes can develop drug ...