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Genome-Wide Genetic Marker Analysis and Genotyping of Escherichia Fergusonii Strain

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Genome-Wide Genetic Marker Analysis and Genotyping of Escherichia Fergusonii Strain bioRxiv preprint doi: https://doi.org/10.1101/2020.07.19.209635; this version posted July 19, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 1 Genome-wide Genetic Marker Analysis and Genotyping of Escherichia fergusonii strain 2 OTSVEF–60 3 Otun Saha1, Nadira Naznin Rakhi2, M. Nazmul Hoque1,3, Munawar Sultana1*, M. Anwar 4 Hossain1+* 5 1Department of Microbiology, University of Dhaka, Dhaka 1000, Bangladesh. 6 2Department of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman 7 Science and Technology University, Gopalganj, Bangladesh. 8 3Department of Gynecology, Obstetrics and Reproductive Health, Bangabandhu Sheikh Mujibur 9 Rahman Agricultural University, Gazipur-1706, Bangladesh 10 +Present Position: Vice-Chancellor, Jashore University of Science and Technology, Jashore-7408, 11 Bangladesh 12 *Correspondence to: 13 Mohammed Anwar Hossain, PhD 14 Professor, Department of Microbiology 15 University of Dhaka, Dhaka, Bangladesh 16 Mobile: 01715-363753 17 E-mail: [email protected] 18 And 19 Dr. Munawar Sultana 20 Associate Professor 21 Department of Microbiology 22 University of Dhaka, Dhaka, Bangladesh 23 Mobile: +8801553636825 24 E-mail: [email protected] 25 26 bioRxiv preprint doi: https://doi.org/10.1101/2020.07.19.209635; this version posted July 19, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 27 Abstract 28 Poultry originated Escherichia fergusonii (POEF), an emerging bacterial pathogen, 29 causes a wide range of intestinal and extra-intestinal infections in the poultry industry which 30 incurred significant economic losses worldwide. Chromosomal co-existence of antibiotics and 31 metal resistance genes has recently been the focal point of POEF isolates besides its pathogenic 32 potentials. This study reports the complete genome analysis of POEF strain OTSVEF-60 from 33 the poultry originated samples of Bangladesh. The assembled draft genome of the strain was 4.2 34 Mbp containing 4,503 coding sequences, 120 RNA (rRNA = 34, tRNA = 79, ncRNA = 7), and 35 three intact phage signature regions. Forty one broad range antibiotic resistance genes (ARGs) 36 including dfrA12, qnrS1, blaTEM-1, aadA2, tet(A) and sul-2 along with multiple efflux pump 37 genes were detected, which translated to phenotypic resistant patterns of the pathogen to 38 trimethoprim, fluoroquinolones, β-lactams, aminoglycoside, tetracycline, and sulfonamides. 39 Moreover, 22 metal resistance genes were found co-existing within the genome of the POEF 40 strain, and numerous virulence genes (VGs) coding for cit (AB), feo (AB), fep (ABCG), csg 41 (ABCDEFG), fliC, ompA, gadA, ecpD etc were also identified throughout the genome. In 42 addition, we detected a Class I integron gene cassette harboring dfrA12, ant (3″)-I and qacEΔ- 43 sul2) genes, 42 copies of insertion sequence (IS) elements, and two CRISPR arrays. The 44 genomic functional analysis revealed overexpression of several metabolic pathways related to 45 motility, flagellar assembly, epithelial cell invasion, quorum sensing, biofilm formation, and 46 biosynthesis of vitamin, co-factors, and secondary metabolites. We herein for the first time 47 detected multiple ARGs, VGs, mobile genetic elements, and some metabolic functional genes in 48 the complete genome of POEF strain OTSVEF-60, which might be associated with the bioRxiv preprint doi: https://doi.org/10.1101/2020.07.19.209635; this version posted July 19, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 49 pathogenesis, spreading of ARGs and VGs, and subsequent treatment failure against this 50 emerging avian pathogen with currently available antimicrobials. 51 Key words: Whole genome sequence, Escherichia fergusonii, poultry, virulence, multidrug and 52 metal resistance. 53 54 Introduction 55 Escherichia fergusonii, an opportunistic emerging pathogen is the closest relative of E. 56 coli showing 64% similarity in DNA hybridization1. This species was formerly known as Enteric 57 Group 10, due to its biochemically distinct nature compared to other species, and bio-groups of 58 the family Enterobacteriaceae2. E. fergusonii was initially isolated from human clinical 59 samples2,3, however can cause septicemia and diarrhea in animals including several avian 60 species4-7. The first available whole genome data of E. fergusonii was published as a part of 61 survey analyzing E. coli genome evolution8. Since the first report, there has been an increasing 62 number of case reports of E. fergusonii of animal origin, isolated mainly from feces of domestic 63 animals and birds4-7. This organism is also being frequently isolated from foods of animal origin 64 such as beef, and cheese during routine screening9. But its significance regarding public health 65 concern was not realized initially, while it has recently been considered as an emerging zoonotic 66 pathogen2,3, and also possesses an extended spectrum of resistance to antibiotics10,11. This enteric 67 pathogen can cause a variety of clinical symptoms in poultry including septicemia and diarrhea4,7 68 with an approximate mortality rate of 18–30% in one-day-old chicks11. This bacterium was also 69 identified as the dominant member of the aerobic microbial community in birds including 70 poultry4,12. bioRxiv preprint doi: https://doi.org/10.1101/2020.07.19.209635; this version posted July 19, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 71 The emergence of antimicrobial resistant, and pathogenic strains of bacteria in food- 72 producing animals especially the chicken represents a serious food safety concern, and is a threat 73 to public health. The determinants of antibiotic resistance have been identified on mobile genetic 74 elements (MGEs), such as plasmids, transposons, and integrons of the bacteria isolated, 75 identified and sequenced from poultry originated samples, thus potentially allowing these 76 determinants to be spread between species11,13. The plasmids of bacteria are self-replicating, 77 extrachromosomal replicons, and crucial agents of genetic change in microbial populations. In 78 addition to conferring resistance to multiple antibiotics, naturally occurring plasmids can also 79 promote the spread of a variety of traits, including resistance to mercury and other heavy metals, 80 virulence, fitness, and the metabolism of unusual compounds13,14. The extended spectrum of 81 antibiotic resistance genes (ARGs), and its association with MGEs in E. fergusonii isolates has 82 mainly attracted attention to this bacterial species in recent times11. In a recent study, Simmons et 83 al. (2016) reported that the majority of the isolated POEF were resistant to β-lactams, 84 aminoglycosides, tetracycline and sulfonamides in different broiler chicken farms of Canada15. 85 Besides, several other studies on POEF reported plasmid associated resistance markers 86 responsible for resistance to aminoglycosides, tetracycline, sulfonamide, trimethoprim and beta- 87 lactams as well as the chromosomal mutation on gyrA mediated quinolone resistance16,17. 88 Therefore, the association of bacterial MGEs with antimicrobial resistance might have 89 contributed to the dissemination of ARGs and VGs among multiple bacterial genera of human, 90 and veterinary importance14. Furthermore, the presence of ARGs carried by MGEs, such as 91 plasmids, may also lead the resistance genes to enter into the human food chain through 92 horizontal gene transfer to other enteric bacteria or bacteria of potential food safety concern18. 93 However, operons related to tolerance to heavy metals including manganese, mercury, nickel, bioRxiv preprint doi: https://doi.org/10.1101/2020.07.19.209635; this version posted July 19, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 94 tellurium, silver, copper and cobalt-zinc-cadmium were also found in E. fergusonii of poultry 95 origin16. Most importantly, the mobilome carrying heavy metal tolerance operons may lead to the 96 co-selection of antibiotic-resistance, when heavy metals in animal feeds (copper, zinc and nickel 97 for improvement of animal health and growth), or in topical medications (silver and copper for 98 the treatments of superficial wounds) or the feed contaminants (mercury and arsenic) reach a 99 toxic concentration causing a long term selective pressure19. 100 Therefore, the pathogenic potentiality along with resistance determinants makes this 101 organism a potential threat not only to animal health, but also to public health. Till to date, only 102 few pathogens such as Salmonella, Enterococcus spp., Clostridium perfringens and Escherichia 103 coli from poultry have been studied extensively at genomic
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