A strain defined as a novel species in the Acinetobacter genus co-harboring chromosomal associated tet(X3) and plasmid associated blaNDM-1 from a beef cattle farm in Hebei, China

文献类型： 外文期刊

第一作者： Wang, Qing

作者： Wang, Qing;Shoaib, Muhammad;Qiu, Yanhua;Zhang, Chao;Dai, Guonian;Lin, Honglin;Wang, Weiwei;Zhang, Jiyu;Wang, Qing;Wei, Yanming;Zhang, Chao;Dai, Guonian;Lin, Honglin;Zhang, Jiyu;Wang, Qing;Shoaib, Muhammad;Qiu, Yanhua;Zhang, Chao;Dai, Guonian;Lin, Honglin;Wang, Weiwei;Zhang, Jiyu;Wang, Qing;Shoaib, Muhammad;Qiu, Yanhua;Zhang, Chao;Dai, Guonian;Lin, Honglin;Wang, Weiwei;Zhang, Jiyu

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关键词： antibiotic resistance genes (ARGs); tet(X); blaNDM; Acinetobacter; multi-drug resistance; pdif module

期刊名称：FRONTIERS IN CELLULAR AND INFECTION MICROBIOLOGY （ 影响因子：4.8； 五年影响因子：5.5 ）

ISSN： 2235-2988

年卷期： 2025 年 15 卷

页码：

收录情况： SCI

摘要： Introduction The co-existence phenomenon of antibiotic resistance genes (ARGs), particularly of last-resort antibiotics in multi-drug resistant (MDR) bacteria, is of particular concern in the least studied bacterial species.Methods In 2023, strain M2 was isolated from the sludge sample at a commercial bovine farm in Hebei province, China, using a MacConkey plate containing meropenem. PCR amplification and Sanger sequencing verified it co-carrying bla NDM and tet(X) genes. It was classified within the Acinetobacter genus by MALDI-TOF-MS and 16S rDNA analyses. Whole-genome sequencing (WGS) was performed on the Oxford Nanopore platform, with species-level identification via ANI and dDDH. Antimicrobial susceptibility testing was performed against 20 antibiotics. Conjugation assays employed the filter-mating method using E. coli J53 and Salmonella LGJ2 as recipients.Results This strain was confirmed as a novel species of Acinetobacter genus, showing resistance to meropenem, ampicillin, ceftazidime, cefepime, gentamicin, kanamycin, fosfomycin, imipenem, ertapenem, and tetracycline. Despite carrying tet(X3), it remained susceptible to tigecycline, omadacycline, and doxycycline. The genome carried 11 ARG types, multiple metal resistance genes (MRGs), and virulence factor (VF) genes. The bla NDM-1 was located in a skeleton, ISAba125-bla NDM-1-ble MBL-trpF, which was carried by an ISAba14-mediated rolling-circle-like structure in pM2-2-NDM-1 (rep_cluster_481). Integrative and conjugative element (ICE) and multiple pdif modules (driven by the XerCD site-specific recombination (XerCD SSR) system), which were associated with the mobilization of resistance determinants, were identified in this plasmid. Chromosomal tet(X3) was mediated by ISVsa3, forming a skeleton, ISVsa3-XerD-tet (X3)-res-ISVsa3.Discussion The co-occurrence of bla NDM and tet(X) in a novel species of the Acinetobacter genus hints that substantial undiscovered bacteria co-carrying high-risk ARGs are concealing in the agroecological system, which should cause particular concern.

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