title: Diversity of the Tetracycline Mobilome within a Chinese Pig Manure Sample.
abstract: Tetracycline antibiotics are widely used in livestock, and tetracycline resistance genes (TRG) are frequently reported in the manure of farmed animals. However, the diversity of TRG-carrying transposons in manure has still been rarely investigated. Using a culture-free functional metagenomic procedure, combined with large-insert library construction and sequencing, bioinformatic analyses, and functional experiments, we identified 17 distinct TRGs in a single pig manure sample, including two new tet genes: tet(59), encoding a tetracycline efflux pump, and tet(W/N/W), encoding mosaic ribosomal protection. Our study also revealed six new TRG-carrying putative nonconjugative transposons: Tn5706-like transposon Tn6298, IS200/605-related transposon Tn6303, Tn3 family transposon Tn6299, and three ISCR2-related transposons, Tn62300, Tn62301, and Tn62302 IMPORTANCE: Fertilization of agricultural fields with animal manure is believed to play a major role in antibiotic resistance dissemination in the environment. There is growing concern for the possible spread of antibiotic resistance from the environment to humans since genetic resistance determinants may be located in transposons and other mobile genetic elements potentially transferable to pathogens. Among the various antibiotic resistance genes found in manure, tetracycline resistance genes (TRGs) are some of the most common. The present study provides a detailed snapshot of the tetracycline mobilome in a single pig manure sample, revealing an unappreciated diversity of TRGs and potential TRG mobility vectors. Our precise identification of the TRG-carrying units will enable us to investigate in more details their mobility effectiveness.
authors: State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.
authors: Sébastien Olivier
authors: SO
authors: Leclercq
authors: State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.
authors: Chao
authors: C
authors: Wang
authors: State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.
authors: Yaxin
authors: Y
authors: Zhu
authors: College of Life Sciences, Hebei University, Baoding, China.
authors: Hai
authors: H
authors: Wu
authors: State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.
authors: Xiaochen
authors: X
authors: Du
authors: State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.
authors: Zhipei
authors: Z
authors: Liu
authors: State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China fengj@im.ac.cn.
authors: Jie
authors: J
authors: Feng
mesh_terms: D000818:Animals; D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000302:isolation & purification; D002681:China; D019295:Computational Biology; D004251:DNA Transposable Elements; D015723:Gene Library; D005798:Genes, Bacterial; D014644:Genetic Variation; D059014:High-Throughput Nucleotide Sequencing; D058751:Livestock; D008372:Manure / Q000382:microbiology*; D056186:Metagenomics; D012988:Soil Microbiology; D034421:Sus scrofa; D013552:Swine; D013753:Tetracycline Resistance / Q000235:genetics*
chemical_list: D004251:DNA Transposable Elements; D008372:Manure