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• W4384120147 abstract "Improper use of antibiotics in swine could reduce commensal bacteria and possibly increase pathogen infections via the gut resistome. This study aimed to compare the metaproteomic profiles of the gut resistome and related metabolism in the cecal microbiota of fattening pigs raised under antibiotic-free (ABF) conditions with those of ordinary industrial pigs (controls [CTRL]). The top three relatively abundant microbes in both groups were Escherichia coli, Ruminococcus, and Lactobacillus, followed by Bacteroides and Bifidobacterium. E. coli, Lactobacillus, and Bacteroides were found to be increased in the CTRL group, whereas Ruminococcus and Clostridium were greater in the ABF group. The highest abundances of antibiotic resistance proteins (log2 expression levels [ELs] of >10) were found to be for tetracycline resistance (Tetr) and aminoglycoside resistance (AMGr) proteins found in Bacteroides, with a significant increase in the CTRL group. High Tetr (ELs of 5.32) was found in Ruminococcus in the CTRL group, although pigs in both groups had never received tetracycline, possibly reflecting the influence of environments in farms. In E. coli, AMGr and β-lactamase family proteins were observed in both groups (ELs of 3 to 6), whereas multidrug resistance protein MdtL was significantly expressed in the CTRL group (ELs of around 3). In the ABF group, CRISPR-associated endonucleases Cas1 and Cas9, which function to defend against viruses, were markedly observed in Ruminococcus and Lactobacillus, respectively, with ELs of 8.6 and 4.15, respectively. In conclusion, this study demonstrated that CRISPR-associated endonucleases were markedly observed in the ABF group, whereas higher levels of Tetr, AMGr, and multidrug resistance protein MdtL was markedly observed in dominant bacterial species in the CTRL group. IMPORTANCE In order to control and reduce antibiotic use in animals, the Department of Livestock Development, Thailand, has launched a campaign for antibiotic-free livestock production. The present study has shown for the first time that CRISPR-associated endonucleases Cas1 and Cas9, which function to defend against viruses, were markedly observed in Ruminococcus and Lactobacillus, respectively, in ceca of pigs raised without antibiotics (ABF). The highest abundances of antibiotic resistance proteins were for tetracycline (Tetr) and aminoglycoside resistance (AMGr) proteins found in Bacteroides, with a significant increase in the controls. In E. coli, the microbe with the highest relative abundance, AMGr and β-lactamase family proteins were observed in both groups, whereas multidrug resistance protein MdtL was significantly expressed in the controls. Pigs in both ABF and control groups had never received tetracycline, possibly reflecting the influence of farm environments. We suggest that pigs raised without antibiotics may have more beneficial microorganisms for the gut than pigs raised with antibiotics." @default.
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• W4384120147 date "2023-08-17" @default.
• W4384120147 modified "2023-09-25" @default.
• W4384120147 title "Metaproteomic Analysis of Gut Resistome in the Cecal Microbiota of Fattening Pigs Raised without Antibiotics" @default.
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• W4384120147 doi "https://doi.org/10.1128/spectrum.02223-23" @default.
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