朱鹮大肠杆菌分离鉴定及耐药性与喹诺酮类耐药基因分子特征分析

doi:10.16431/j.cnki.1671-7236.2023.10.037

中国畜牧兽医 ›› 2023, Vol. 50 ›› Issue (10): 4231-4242.doi: 10.16431/j.cnki.1671-7236.2023.10.037

朱鹮大肠杆菌分离鉴定及耐药性与喹诺酮类耐药基因分子特征分析

张辉¹, 邵乐乐¹, 杨永春¹, 季艺¹, 马武林¹, 翟祎梦¹, 白洪青³, 周莹珊¹, 雷蕾¹, 郑亚东¹, 宋厚辉¹, 邱国强²

1. 浙江农林大学动物科技学院/动物医学院, 浙江省畜禽绿色生态健康养殖应用技术研究重点实验室, 动物健康互联网检测技术浙江省工程研究中心, 浙江省动物医学与健康管理国际科技合作基地, 中澳动物健康大数据分析联合实验室, 杭州 311300;
2. 德清县生态林业综合服务中心, 德清 313200;
3. 德清县自然资源规划局, 德清 313200

收稿日期:2023-03-23 出版日期:2023-10-05 发布日期:2023-09-26
通讯作者: 杨永春;邱国强 E-mail:yyc@zafu.edu.cn;qiuguoqiang7777@163.com
作者简介:张辉,E-mail:zhanghui@stu.zafu.edu.cn;邵乐乐,E-mail:1393823677@qq.com
基金资助:
国家自然科学基金(32102671)；国家级大学生创新创业训练计划项目(202210341047)；湖州市科技计划项目(2022GZ40)

Isolation,Identification and Molecular Characteristics of Drug Resistance and Quinolone Resistance Genes in Escherichia coli from Nipponia nippon

ZHANG Hui¹, SHAO Lele¹, YANG Yongchun¹, JI Yi¹, MA Wulin¹, ZHAI Yimeng¹, BAI Hongqing³, ZHOU Yingshan¹, LEI Lei¹, ZHENG Yadong¹, SONG Houhui¹, QIU Guoqiang²

1. Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, Zhejiang International Science and Technology Cooperation Base for Veterinary Medicine and Health Management, China-Australia Joint Laboratory for Animal Health Big Data Analytics, College of Animal Science and Technology & College of Veterinary Medicine, Zhejiang Agriculture and Forestry University, Hangzhou 311300, China;
2. Deqing County Ecological Forestry Comprehensive Service Center, Deqing 313200, China;
3. Deqing Natural Resources and Planning Bureau, Deqing 313200, China

Received:2023-03-23 Online:2023-10-05 Published:2023-09-26

摘要/Abstract

摘要： 【目的】掌握浙江省德清县驯养朱鹮大肠杆菌的耐药性、耐药基因与分子特征,为治疗朱鹮大肠杆菌感染提供基础数据。【方法】采集该地驯养朱鹮新鲜粪便样本,采用分离培养、形态观察、生化鉴定及16S rDNA序列分析鉴定大肠杆菌;进而采用肉汤稀释法检测环丙沙星、庆大霉素、丁胺卡那等7种抗菌药对源自不同朱鹮的大肠杆菌分离株菌株的最小抑菌浓度(minimal inhibitory concentration,MIC);选择代表性菌株,通过PCR和测序鉴定其携带qnrS1、gyrA、gyrB等9种喹诺酮类耐药基因的情况,并分析其蛋白关键氨基酸位点突变与耐药性的关系,采用接合转移分析耐药质粒水平转移情况及其与耐药性的关系,应用卡方检验(Chi-square test)和费歇尔精确检验(Fisher exact test)分析分离株耐药表型与朱鹮年龄、耐药基因的相关性。【结果】本研究共采集了98只朱鹮的粪便,经分离鉴定均获得了大肠杆菌;源自不同朱鹮的98株大肠杆菌对喹诺酮类环丙沙星呈现高度耐药(耐药率为65.3%,64/98),对其余6种药物高度敏感(敏感率均＞90%),朱鹮年龄与环丙沙星耐药性极显著相关(P＜0.01);选取的31株分离株喹诺酮类耐药基因marR、gyrA、parC和gyrB的突变株占比在3.2%~80.6%之间,携带质粒耐药基因qnrS1的菌株占比22.6%(7/31);耐药基因阳性菌株占比93.5%(29/31)并分布于6个耐药基因型,其中,marR/gyrA/parC 10株、marR/qnrS1 6株、marR 6株、gyrA/parC 3株、marR/gyrA 3株、marR/gyrB/qnrS1 1株;环丙沙星耐药表型与耐药基因显著相关(P＝0.026),gyrA和parC单基因或联合突变均与喹诺酮耐药显著相关(P＝0.038);大肠杆菌分离株qnrS1基因一次接合成功率为28.6%(2/7),并可导致受体菌对喹诺酮类药物的耐药性增加。【结论】本研究鉴定了朱鹮群体大肠杆菌耐药性,并明确了朱鹮源大肠杆菌对喹诺酮类耐药的主要原因是gyrA和parC单基因或联合突变并携带可水平转移的耐药基因qnrS1,本研究结果为人工驯养朱鹮救护和耐药性监测提供参考依据,提示应重视朱鹮大肠杆菌对喹诺酮类药物的耐药性。

关键词: 朱鹮; 喹诺酮; 耐药基因; 分子特征

Abstract: 【Objective】 The experiment was aimed to master the drug resistance,resistance genes,and molecular characteristics of Escherichia coli (E.coli) in domesticated Nipponia nippon in Deqing county,Zhejiang province,and provide basic data for the treatment of E.coli infection in Nipponia nippon.【Method】 Fresh feces of Nipponia nippon were collected and E.coli isolates were identified by using bacteria isolation and culture,biochemical characteristics and 16S rDNA sequencing. Then the broth dilution method was used to detect the minimum inhibitory concentration (MIC) of seven kinds of antimicrobial agents,including ciprofloxacin,gentamicin,amikacin and so on,against E.coli isolates from different Nipponia nippon. Nine quinolone resistance genes such as qnrS1,gyrA, gyrB and so on of the respective strains were identified by PCR and sequencing,and the relationship between the mutation of the amino acid and drug resistance was analyzed.The horizontal transfer of plasmids carrying resistance genes were detected by conjugation experiments,and drug resistance were determined.The association between host’s age,drug resistance-genes and drug resistance were analyzed by using Chi-square test and Fisher exact test.【Result】 A total of 98 Nipponia nippon feces were collected and all were isolated and identified with E.coli strains.Of which,98 isolates from different captive Nipponia nippon were highly resistant to quinolone ciprofloxacin (65.3%,64/98),and highly sensitive to the remaining 6 drugs (sensitivity rates were above 90%).The age of Nipponia nippon was highly significantly correlated with ciprofloxacin resistance (P＜0.01).Thirty-one E.coli strains isolated in this study were selected for resistance genes detection.The prevalence of mutations in the quinolone resistant genes marR,gyrA,parC,and gyrB in 31 selected isolates ranged from 3.2% to 80.6%,and the proportion of strains carrying the plasmid resistant gene qnrS1 was 22.6% (7/31).The isolates carrying one or more resistance genes accounted for 93.5% (29/31),and were distributed in six drug resistance genotypes,including 10 strains of marR/gyrA/parC genes,6 strains of marR/qnrS1 genes,6 strains of marR gene,3 strains of gyrA/parC genes, 3 strains of marR/gyrA genes,and 1 strain of marR/gyrB/qnrS1 genes.The ciprofloxacin resistance phenotype was significantly correlated with drug resistance genotype (P＝0.026). Both monogenic and combined mutations of the gyrA and parC genes were related to quinolone resistance (P＝0.038).The conjugation experiment results showed that the transfer success rate of the qnrS1 resistance gene carried by the E.coli isolates in this study was 28.6% (2/7) in one conjugation event,which could lead to an increase in quinolone resistance in the recipient bacteria.【Conclusion】 This study identified the antibiotic resistance of E.coli from Nipponia nippon,and identified that the main cause of quinolone resistance in Nipponia nippon was single or combined mutation of gyrA and parC genes,carrying the horizontally transferable resistance gene qnrS1.This study provided a reference for rescuing Nipponia nippon and a baseline data for quinolone resistance surveillance of Nipponia nippon.

Key words: Nipponia nippon; quinolone; drug resistance gene; molecular characteristic

中图分类号:

S852.61^＋2

张辉, 邵乐乐, 杨永春, 季艺, 马武林, 翟祎梦, 白洪青, 周莹珊, 雷蕾, 郑亚东, 宋厚辉, 邱国强. 朱鹮大肠杆菌分离鉴定及耐药性与喹诺酮类耐药基因分子特征分析[J]. 中国畜牧兽医, 2023, 50(10): 4231-4242.

ZHANG Hui, SHAO Lele, YANG Yongchun, JI Yi, MA Wulin, ZHAI Yimeng, BAI Hongqing, ZHOU Yingshan, LEI Lei, ZHENG Yadong, SONG Houhui, QIU Guoqiang. Isolation,Identification and Molecular Characteristics of Drug Resistance and Quinolone Resistance Genes in Escherichia coli from Nipponia nippon[J]. China Animal Husbandry and Veterinary Medicine, 2023, 50(10): 4231-4242.

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朱鹮大肠杆菌分离鉴定及耐药性与喹诺酮类耐药基因分子特征分析

Isolation,Identification and Molecular Characteristics of Drug Resistance and Quinolone Resistance Genes in Escherichia coli from Nipponia nippon

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