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Research Article

Diverse Antibiotic Resistance Genes in Dairy Cow Manure

Fabienne Wichmann, Nikolina Udikovic-Kolic, Sheila Andrew, Jo Handelsman
Jizhong Zhou, Editor
Fabienne Wichmann
aDepartment of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut, USA
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Nikolina Udikovic-Kolic
aDepartment of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut, USA
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Sheila Andrew
bDepartment of Animal Sciences, University of Connecticut, Storrs, Connecticut, USA
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Jo Handelsman
aDepartment of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut, USA
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Jizhong Zhou
University of Oklahoma
Roles: Editor
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DOI: 10.1128/mBio.01017-13
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ABSTRACT

Application of manure from antibiotic-treated animals to crops facilitates the dissemination of antibiotic resistance determinants into the environment. However, our knowledge of the identity, diversity, and patterns of distribution of these antibiotic resistance determinants remains limited. We used a new combination of methods to examine the resistome of dairy cow manure, a common soil amendment. Metagenomic libraries constructed with DNA extracted from manure were screened for resistance to beta-lactams, phenicols, aminoglycosides, and tetracyclines. Functional screening of fosmid and small-insert libraries identified 80 different antibiotic resistance genes whose deduced protein sequences were on average 50 to 60% identical to sequences deposited in GenBank. The resistance genes were frequently found in clusters and originated from a taxonomically diverse set of species, suggesting that some microorganisms in manure harbor multiple resistance genes. Furthermore, amid the great genetic diversity in manure, we discovered a novel clade of chloramphenicol acetyltransferases. Our study combined functional metagenomics with third-generation PacBio sequencing to significantly extend the roster of functional antibiotic resistance genes found in animal gut bacteria, providing a particularly broad resource for understanding the origins and dispersal of antibiotic resistance genes in agriculture and clinical settings.

IMPORTANCE The increasing prevalence of antibiotic resistance among bacteria is one of the most intractable challenges in 21st-century public health. The origins of resistance are complex, and a better understanding of the impacts of antibiotics used on farms would produce a more robust platform for public policy. Microbiomes of farm animals are reservoirs of antibiotic resistance genes, which may affect distribution of antibiotic resistance genes in human pathogens. Previous studies have focused on antibiotic resistance genes in manures of animals subjected to intensive antibiotic use, such as pigs and chickens. Cow manure has received less attention, although it is commonly used in crop production. Here, we report the discovery of novel and diverse antibiotic resistance genes in the cow microbiome, demonstrating that it is a significant reservoir of antibiotic resistance genes. The genomic resource presented here lays the groundwork for understanding the dispersal of antibiotic resistance from the agroecosystem to other settings.

  • Copyright © 2014 Wichmann et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-ShareAlike 3.0 Unported license, which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Diverse Antibiotic Resistance Genes in Dairy Cow Manure
Fabienne Wichmann, Nikolina Udikovic-Kolic, Sheila Andrew, Jo Handelsman
mBio Apr 2014, 5 (2) e01017-13; DOI: 10.1128/mBio.01017-13

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Diverse Antibiotic Resistance Genes in Dairy Cow Manure
Fabienne Wichmann, Nikolina Udikovic-Kolic, Sheila Andrew, Jo Handelsman
mBio Apr 2014, 5 (2) e01017-13; DOI: 10.1128/mBio.01017-13
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