genome

contains genes acquired from a variety of organisms that are implicated in the development of antibiotic resistance.

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Following the recent publication of the Streptococcus pyogenes genome Makoto Kuroda and colleagues at Juntendo University, Tokyo, have published the entire genome of another medically important pathogenic bacterium, Staphylococcus aureus in 21 April Lancet. S. aureus is a gram-positive coccus carried by about 30% of the healthy human population. But in hospitalised patients it is the major cause of severe hospital–acquired infections with some strains now resistant to the most powerful antibiotics available.

Kuroda et al used the shot-gun random sequencing method to determine the genome of two related S. aureus strains (N315 — methicillin resistant and Mu50 — vancomycin resistant). They found an elaborate combination of genes, many seemingly acquired by lateral gene transfer, demonstrating a remarkable ability to acquire potentially useful genes from a variety of organisms. Their findings include:

• 70 candidates for new virulence factors;

• antibiotic resistance genes carried either by plasmids or by mobile ...

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