103个mcr质粒的结构与特征

doi:10.3969/j.issn.1004-1524.2021.01.06

浙江农业学报 ›› 2021, Vol. 33 ›› Issue (1): 43-51.DOI: 10.3969/j.issn.1004-1524.2021.01.06

103个mcr质粒的结构与特征

唐标^1a^,^1b(), 常江^1a^,^1b^,², 胡骥^1b, 钱鸣蓉^1a^,^1b, 夏效东³, 杨华^1a^,^1b^,^*()

1.浙江省农业科学院 a农产品质量安全危害因子与风险防控国家重点实验室(筹),b农产品质量标准研究所,浙江杭州 310021
2.上海交通大学农业与生物学院,上海 200240
3.西北农林科技大学食品科学与工程学院,陕西杨凌 712100

收稿日期:2020-07-31 出版日期:2021-01-25 发布日期:2021-01-25
通讯作者: 杨华
作者简介:*杨华,E-mail:yanghua@zaas.ac.cn
唐标(1987—),男,江苏徐州人,博士,助理研究员,从事动物源细菌耐药性研究。E-mail:tb_411@163.com
基金资助:
国家自然科学基金青年科学基金(31700007);浙江省重点研发计划(2020C02031);省部共建农产品质量安全危害因子与风险防控国家重点实验室项目(2010DS700124-ZZ2008)

Structures and characteristics of 103 plasmids carrying mcr gene

TANG Biao^1a^,^1b(), CHANG Jiang^1a^,^1b^,², HU Ji^1b, QIAN Mingrong^1a^,^1b, XIA Xiaodong³, YANG Hua^1a^,^1b^,^*()

1. a State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products (in Prepared), b Institute of Quality and Standard for Agro-Products, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
2. School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
3. College of Food Science and Engineering, Northwest A & F University, Yangling 712100, China

Received:2020-07-31 Online:2021-01-25 Published:2021-01-25
Contact: YANG Hua

摘要/Abstract

摘要：

黏菌素是治疗碳青霉烯类耐药菌感染的最后一线药物。然而,近年来在许多致病菌中发现质粒介导的黏菌素耐药基因mcr传播,降低了黏菌素的有效性,对公众健康构成了威胁。为探讨可能影响黏菌素耐药性传播的质粒特征,基于mcr质粒的完成图,共分析了2015—2018年GenBank收录的103个携带mcr的完整质粒序列。结果表明:质粒主要来源于中国,大肠埃希菌为主要携带者;IncI2和IncX4是最主要的复制子类型,IncHI2是携带有多个耐药基因质粒的优势复制子类型;sul3、aadA1与mcr基因在质粒中共存的概率最高。另外还发现,95.14%的质粒含有抗消毒剂或重金属抗性基因。除ISApl1外,IS26插入序列出现频率最高。18.45%的质粒具有接合转移元件,包括oriT、松弛酶(relaxase)、T4CP和T4SS。本文重点指出了耐药基因交叉抗性和重金属的共选择作用,为更好地控制黏菌素耐药性提供了思路。

关键词: 黏菌素, mcr-1, 质粒完成图, 多重耐药

Abstract:

Colistin is the last first-line drug in the treatment of carbapenem-resistant pathogens infection. However, the widespread of plasmid mediated mcr gene which involved colistin resistance had reduced the effectiveness and posed a threat to public health. The purpose of this study was to summarize the complete plasmids bearing mcr and explore plasmid characteristics that might affect the spread of colistin resistance. A total of 103 complete plasmid sequences carrying mcr which were released in GenBank from 2015 to 2018 were analyzed. The results showed that the main plasmids were from China and Escherichia coli was the main host. IncI2 and IncX4 were the most important replicon types, and IncHI2 was the dominant type of plasmids with multiple resistance genes. Meanwhile, 95.14% of the plasmids contained antibacterial biocide or heavy metal resistance genes. Except for ISApl1, the frequency of IS26 was the highest. 18.45% of them had conjugated transfer elements, including oriT, relaxase, T4CP and T4SS. This study emphasized the co-selection of antibiotics and heavy metals, which provided landscape for better control of colistin resistance.

Key words: colistin, mcr-1, complete plasmid sequence, multi-drug resistance

中图分类号:

S852.61

唐标, 常江, 胡骥, 钱鸣蓉, 夏效东, 杨华. 103个mcr质粒的结构与特征[J]. 浙江农业学报, 2021, 33(1): 43-51.

TANG Biao, CHANG Jiang, HU Ji, QIAN Mingrong, XIA Xiaodong, YANG Hua. Structures and characteristics of 103 plasmids carrying mcr gene[J]. Acta Agriculturae Zhejiangensis, 2021, 33(1): 43-51.

图/表 8

图1 103个携带mcr基因质粒的地域来源

Fig.1 Geographical origin of 103 plasmids carrying mcr gene

图2 103个携带mcr基因质粒的宿主

Fig.2 Hosts of 103 plasmids carrying mcr gene

图3 103个携带mcr基因质粒的复制类型分布

Fig.3 Distribution of replication type of 103 plasmids carrying mcr gene

图4 103个mcr质粒的耐药基因分布

Fig.4 Distribution of antimicrobial resistance genes of 103 plasmids carrying mcr gene

图5 103个mcr质粒所携带耐药基因介导的耐药表型

Fig.5 Drug resistance phenotypes mediated by 103 plasmids carrying mcr gene

图6 103个mcr质粒所含耐药基因数量

Fig.6 Numbers of antimicrobial resistance genes in 103 plasmids carrying mcr gene

图7 103个mcr质粒所携带的消毒剂和重金属抗性基因数量

Fig.7 Numbers of antibacterial biocide and heavy metal-resistance genes in 103 plasmids carrying mcr gene

图8 103个mcr质粒中的可移动元件数量

Fig.8 Numbers of mobile elements in 103 plasmids carrying mcr gene

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103个mcr质粒的结构与特征

Structures and characteristics of 103 plasmids carrying mcr gene

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