基因组学揭示了鼠伤寒沙门氏菌中抗微生物药物耐药性簇tet(B)、sul2、blatemm - 1b、aph(3″)-Ib和aph(6)-Id的染色体整合。

IF 1.9 2区 农林科学 Q3 FOOD SCIENCE & TECHNOLOGY
Zengfeng Zhang, Mengjun Hu, Kannappan Arunachalam, Chunlei Shi
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引用次数: 0

摘要

耐抗生素沙门氏菌对食品安全和公共卫生构成了巨大威胁,四环素是治疗沙门氏菌病的常用抗生素。本研究从腹泻患者(n = 7)和蛤(n = 1)分离的8株鼠伤寒沙门菌均表现出高水平的四环素耐药性(最低抑菌浓度为128 μg/mL),并对氨苄西林和磺胺类药物进一步耐药,形成r型ASuT(氨苄西林、磺胺类药物和四环素)。利用PacBio平台对8株分离菌株进行测序,发现其染色体上存在与r型ASuT相关的四环素耐药基因tet(B)、磺胺类耐药基因sul2、广谱β-内酰胺酶基因blatemm - 1b、氨基糖苷类耐药基因aph(3″)-Ib和aph(6)-Id。在fljBA操纵子中发现了编码tet(B)的4种遗传排列(A、B1、B2、C)。C型(fljBA operon-tet(B)-sul2- blem - 1b -aph(3″)-Ib-aph(6)-Id-merACDEPTR)是最常见的类型,并伴有各种插入序列(IS26、IS1和ISVsa5)和重组酶。成对序列比对表明,C型排列可能是由ISs的作用促进的逐步获得和重排,然后由前噬菌体整合到染色体中。系统基因组分析显示,本研究中8株中国鼠伤寒沙门菌分离株与1株德国人源鼠伤寒沙门菌分离株(DA34821)和1株中国食源性鼠伤寒沙门菌分离株(CFSA629)聚集在一个进化支中,共有≤67个snp,提示发生了克隆传播。这些发现强调了鼠伤寒沙门氏菌中r型ASuT的出现,这是由于染色体上编码的抗微生物药物耐药性基因簇(tet(B), sul2, blatemm - 1b, aph(3″)-Ib和aph(6)-Id)的存在。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Genomics Revealed Novel Chromosomal Integration of Antimicrobial Resistance Cluster tet(B), sul2, blaTEM-1B, aph(3″)-Ib, and aph(6)-Id in Salmonella Typhimurium.

Antimicrobial-resistant Salmonella has posed a huge threat to food safety and public health, and tetracycline is the commonly used antibiotic for treating salmonellosis. In this study, eight Salmonella Typhimurium isolates from diarrhea patients (n = 7) and clam (n = 1) exhibited high-level tetracycline resistance (minimum inhibitory concentration = 128 μg/mL), and these isolates were further resistant to ampicillin and sulfonamides, formatting the R-type ASuT (ampicillin, sulfonamides, and tetracycline). Then, these eight isolates were sequenced using PacBio platform, revealing the presence of tetracycline resistance gene tet(B), along with sulfonamide-resistance gene sul2, extended-spectrum-β-lactamase gene blaTEM-1B, and aminoglycoside resistance genes aph(3″)-Ib and aph(6)-Id on the chromosome, which was associated with R-type ASuT. Four types (A, B1, B2, and C) of genetic arrangement for chromosomally encoding tet(B) were found, inserted into fljBA operon. Type C (fljBA operon-tet(B)-sul2-blaTEM-1B-aph(3″)-Ib-aph(6)-Id-merACDEPTR) was the most common type and was accompanied by various insertion sequences (ISs) (IS26, IS1, and ISVsa5) and recombinases. Pairwise sequence alignment showed that type C arrangement likely resulted from stepwise acquisitions and rearrangements facilitated by the actions of ISs, followed by integration into the chromosome by prophages. Phylogenomic analysis showed that all eight Salmonella Typhimurium isolates from China in this study, along with a human-borne Salmonella Typhimurium isolate (DA34821) from Germany and a foodborne Salmonella Typhimurium isolate (CFSA629) from China, clustered into a single clade, sharing ≤67 SNPs, which suggested that clone spread occurred. These findings underline the emergence of R-type ASuT in Salmonella Typhimurium, which is attributed to the presence of an antimicrobial resistance gene cluster (tet(B), sul2, blaTEM-1B, aph(3″)-Ib, and aph(6)-Id) encoded on the chromosome.

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来源期刊
Foodborne pathogens and disease
Foodborne pathogens and disease 医学-食品科技
CiteScore
5.30
自引率
3.60%
发文量
80
审稿时长
1 months
期刊介绍: Foodborne Pathogens and Disease is one of the most inclusive scientific publications on the many disciplines that contribute to food safety. Spanning an array of issues from "farm-to-fork," the Journal bridges the gap between science and policy to reduce the burden of foodborne illness worldwide. Foodborne Pathogens and Disease coverage includes: Agroterrorism Safety of organically grown and genetically modified foods Emerging pathogens Emergence of drug resistance Methods and technology for rapid and accurate detection Strategies to destroy or control foodborne pathogens Novel strategies for the prevention and control of plant and animal diseases that impact food safety Biosecurity issues and the implications of new regulatory guidelines Impact of changing lifestyles and consumer demands on food safety.
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