ArticlebioRxiv : the preprint server for biology2025
Loss of DNA mismatch repair genes leads to acquisition of antibiotic resistance independent of secondary mutations.
Article in bioRxiv : the preprint server for biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Antibiotic resistant bacteria have been a rising clinical concern for decades. Beyond acquisition of alleles conferring resistance, bacteria under stress (e.g., from changing environmental conditions or mutations) can have higher intrinsic resistance to antibiotics than unstressed cells. This concern is expanded for gram-negative bacteria which have a protective outer membrane serving as an additional barrier against harmful molecules such as antibiotics. Here, we report a pathway which increases antibiotic resistance (i.e., minimum inhibitory concentration) in response to inactivation of the DNA Mismatch Repair pathway (MMR). This pathway led to increased intrinsic resistance and was independent of secondary mutations. Specifically, deletion of the DNA mismatch repair genes
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