Pre-existing chromosomal polymorphisms in pathogenic E. coli potentiate the evolution of antibiotic resistance by MCR-1 plasmid acquisition
Pre-existing chromosomal polymorphisms in pathogenic E. coli potentiate the evolution of antibiotic resistance by MCR-1 plasmid acquisition
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致病性大肠杆菌中预先存在的染色体多态性通过 MCR-1 质粒的获得增强了抗生素耐药性的进化
DOI:
10.1101/2022.02.20.481192
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Jangir P
中科院分区:
文献类型:
--
作者:
Jangir P
Bacterial pathogens show high levels of standing genetic diversity, but the influence of this diversity on the evolution of antibiotic resistance remains unclear. Here we address this problem in the context of colistin, a ‘last line of defense’ antibiotic. Using experimental evolution, we show that a plasmid carrying the MCR-1 colistin resistance gene dramatically increases the ability ofE. colipopulations to evolve high-level colistin resistance by acquiring mutations inlpxC, an essential chromosomal gene involved in lipopolysaccharide biosynthesis. Crucially,lpxCmutations increase colistin resistance in the presence of the MCR-1 gene, but decrease the resistance of wild-type cells, revealing positive sign epistasis for antibiotic resistance. Analysis of public genomic datasets shows thatlpxCpolymorphisms are common in pathogenicE. colicarrying MCR-1, highlighting the clinical relevance of this interaction. Importantly,lpxCdiversity is high in pathogenicE. colifrom regions with no history of MCR-1 acquisition, suggesting that pre-existinglpxCpolymorphisms have potentiated the evolution of high-level colistin resistance by MCR-1 acquisition. More broadly, these findings highlight the importance of standing genetic variation and plasmid/chromosomal interactions in the evolutionary dynamics of antibiotic resistance.
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