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by giarc
4177 days ago
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Microbiologist here. Your last sentence is perhaps not correct, or else I am not understanding it well enough. Plasmids are indeed a source of resistance, but plasmids just contain genetic code. They are considered mobile since they are easily transferable between bacteria (including different species). So for a plasmid to encode resistance to this new antibiotic, it would need to contain the code for a protein which disrupts the action for the antibiotic. For example, the plasmid would encode for an enzyme that digests the antibiotic at a faster rate than it can work, or bind to the target of the antibiotic with a higher affinity. So maybe what you were getting at is that a plasmid exists out in the world that encodes the protein for resistance, it just didn't happen to exist in the researchers niche world, or doesn't rely on a random mutation to become a resistance product. |
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Per cowsandmilk the senior author of the publication "is one of the world's foremost experts on antibiotic resistance". The paper discusses how there seems to be little gene transfer between the "biome" of soil bacteria from which this and vancomycin come and the relevant pathogens. They specifically cite that it took 30 years for any resistance to develop to vancomycin.
Whereas I'd add β-Lactam antibiotics seem to be pretty common (they are derived from at least 5 different organisms that I just counted in Wikipedia), and β-Lactamases are all too common; per Wikipedia https://en.wikipedia.org/wiki/Beta-lactamase the first was discovered in 1940 before penicillin was in clinical use.