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. 2020 Mar 10;11:352. doi: 10.3389/fmicb.2020.00352

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Copyright © 2020 Lin, Dong, Wu, Rao, Zhang, Faraj and Yang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Sequencing evidence for horizontal transfer of ARGs between the environmental (polluted Jin River) and avian (egret) E. coli. (A,B) Exhibit the distribution of ARGs (green arrows) and MGEs on plasmids p2_BE2-5 and pMCR_W5-6, respectively. The MDR regions (R_island) of the similar structure are indicated as purple fragments on both plasmids. Their structures in detail are illustrated in (C), and the sequence alignment of two R_islands is exhibited in (D). The MDR region is composed of one integron (red arrows indicate site-specific integrase/recombinase genes) and one IS26_aph(3′)-Ia_IS26 composite transposon (black arrows for transposase genes, tnpA IS26 etc.). The recombination event (mef(B) gene) in the MDR region is indicated in blue (A,C, on plasmid p2_PE2-5). The mismatches between sequences were indicated with asterisks in (D). A BRIG-Easyfig version of this figure is shown in supporting information as Supplementary Figure S4.