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Global Variation in Escherichia coli mcr-1 Genes and Plasmids from Animal and Human Genomes Following Colistin Usage Restrictions in Livestock
Garcias Puigserver, Biel (Universitat Autònoma de Barcelona. Departament de Sanitat i d'Anatomia Animals)
Flores, Mayra Alejandra (Universitat Autònoma de Barcelona. Departament de Sanitat i d'Anatomia Animals)
Fernández, Mercedes (Universitat Autònoma de Barcelona. Departament de Sanitat i d'Anatomia Animals)
Monteith, William (University of Oxford. Department of Biology)
Pascoe, Ben (University of Oxford. Department of Biology)
Sheppard, Samuel K. (University of Oxford. Department of Biology) [...] Show all 9 authors

Date: 2024
Abstract: Antimicrobial resistance (AMR) is a significant global health threat, with multidrug-resistant (MDR) bacterial clones becoming a major concern. Polymyxins, especially colistin, have reemerged as last-resort treatments for MDR Gram-negative infections. However, colistin use in livestock has spread mobile colistin resistance (mcr) genes, notably mcr-1, impacting human health. In consequence, its livestock use was banned in 2017, originating a natural experiment to study bacterial adaptation. The aim of this work was to analyse the changes in the mcr-1 genetic background after colistin restriction across the world. This study analyses 3163 Escherichia coli genomes with the mcr-1 gene from human and livestock hosts, mainly from Asia (n = 2621) and Europe (n = 359). Genetic characterisation identifies IncI2 (40. 4%), IncX4 (26. 7%), and multidrug-resistant IncHI2 (18. 8%) as the most common plasmids carrying mcr-1. There were differences in plasmids between continents, with IncX4 (56. 6%) being the most common in Europe, while IncI2 (44. 8%) was predominant in Asia. Promoter variants related to reduced fitness costs and IS Apl1 showed a distinct pattern of association that appears to be associated with adaptation to colistin restriction, which differed between continents. Thus, after the colistin ban, Europe saw a shift to specialised mcr-1 plasmids as IncX4, while IS Apl1 decreased in Asia due to changes in the prevalence of the distinct promoter variants. These analyses illustrate the evolution of mcr-1 adaptation following colistin use restrictions and the need for region-specific strategies against AMR following colistin restrictions.
Grants: Agència de Gestió d'Ajuts Universitaris i de Recerca FI-SDUR 2020
Rights: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. Creative Commons
Language: Anglès
Document: Article ; recerca ; Versió publicada
Subject: Antimicrobial resistance ; Colistin ; Mcr-1 ; IS Apl1 ; Promoter variants ; Fitness cost ; Escherichia coli
Published in: Antibiotics, Vol. 13 (august 2024) , ISSN 2079-6382

DOI: 10.3390/antibiotics13080759
PMID: 39200059


12 p, 1.9 MB

The record appears in these collections:
Articles > Research articles
Articles > Published articles

 Record created 2024-09-18, last modified 2024-09-22



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