中国畜牧兽医 ›› 2022, Vol. 49 ›› Issue (10): 4019-4031.doi: 10.16431/j.cnki.1671-7236.2022.10.035

• 基础兽医 • 上一篇    下一篇

多重耐药胸膜肺炎放线杆菌GD2107株全基因组测序及生物信息学分析

徐民生1,2, 柯海意1,2, 杨冬霞2, 施科达1,2, 孙泽仪2, 牛佳伟2, 常鑫1,2, 翟少伦2, 臧莹安1, 李春玲2   

  1. 1. 仲恺农业工程学院动物科技学院, 广州 510305;
    2. 广东省农业科学院动物卫生研究所, 广东省畜禽疫病防治研究重点实验室, 农业农村部兽用药物与诊断技术广东科学观测实验站, 广州 510640
  • 收稿日期:2022-06-10 出版日期:2022-10-05 发布日期:2022-09-30
  • 通讯作者: 臧莹安,E-mail:1134580900@qq.com;李春玲,E-mail:lclclare@163.com
  • 作者简介:徐民生,E-mail:379852566@qq.com;柯海意,E-mail:1056124851@qq.com。
  • 基金资助:
    广东省现代农业产业技术体系创新团队项目(2021KJ119);广州市重点研发项目(202206010192);广东省动物疫病野外科学观测研究站项目(2021B1212050021);广州市科技特派员项目(20212100027、20212100010);广东省农业科学院学科建设新兴团队项目(202122TD)

Whole Genome Sequencing and Biological Characteristics Analysis of Multidrug-resistant Actinobacillus pleuropneumoniae GD2107 Strain

XU Minsheng1,2, KE Haiyi1,2, YANG Dongxia2, SHI Keda1,2, SUN Zeyi2, NIU Jiawei2, CHANG Xin1,2, ZHAI Shaolun2, ZANG Yingan1, LI Chunling2   

  1. 1. College of Animal Science and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510305, China;
    2. Guangdong Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Technology, Ministry of Agriculture Rural Affairs, Guangdong Key Laboratory of Livestock Disease Prevention, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
  • Received:2022-06-10 Online:2022-10-05 Published:2022-09-30

摘要: 【目的】通过对多重耐药胸膜肺炎放线杆菌(Actinobacillus pleuropneumoniae,APP)GD2107株进行全基因组测序及生物信息学分析,丰富APP基因组数据库信息;构建基于ApxⅣ基因的系统进化树,分析该菌株的进化关系,为探索APP致病机制和临床防控猪传染性胸膜肺炎(porcine contagious pleuropneumia,PCP)提供参考。【方法】通过药敏试验测定分离菌株的耐药谱;采用全基因组测序技术(whole genome sequencing,WGS)对细菌DNA进行全基因组测序,分别利用Illumina NovaSeq、PacBio SequeI测序平台对全基因组测序结果进行基因功能注释及生物信息学分析(包括基因组基本信息、功能元件分析及亚系统分析等);基于ApxⅣ基因构建系统进化树。【结果】药敏试验结果显示,GD2107菌株对青霉素、头孢拉定(先锋Ⅵ)、卡那霉素等14种抗菌药均耐药。对GD2107株全基因组测序得到1条大小为2 271 987 bp的环状染色体(GC含量为41.21%)和2个大小分别为5 027和3 497 bp的环状质粒,共预测到2 290个编码基因,包含19个rRNA (7个5S rRNA、6个16S rRNA、6个23S rRNA)、21个tRNA基因、20个ncRNA;23个基因岛、4个原噬菌体和2组CRISPR相关序列;分别有2 112、1 549和1 866个基因在COG、KEGG和GO数据库中得到注释,且相关蛋白集中分布于APP的代谢过程;另外在毒力因子(VFDB)和耐药因子(CARD)数据库中还注释到48个毒力基因和22个耐药基因(仅floR基因位于质粒上)。绘制该菌株的全基因组圈图,将基因组信息提交至NCBI,获得染色体GenBank登录号为CP097377,质粒登录号分别为CP097378和CP097379。系统进化树分析发现,该菌株与来自中国的APP菌株(CP063424.1)进化关系最近。【结论】本研究完成了对多重耐药菌株GD2107的全基因组测序与生物信息学分析,全面认识了该菌株基因组的结构和功能并探究了耐药和致病机制中的相关基因,进化关系显示该菌株具有一定的地域流行性,为预防PCP的流行和探索APP的致病机制提供了参考。

关键词: 胸膜肺炎放线杆菌(APP); 全基因组测序; 生物信息学分析; 耐药基因; 系统进化分析

Abstract: 【Objective】 Through genome sequencing and bioinformatics analysis of GD2107 strain of multi-drug resistant Actinobacillus pleuropneumoniae (APP),the genome database information of APP was enriched,the phylogenetic tree based on ApxⅣ gene was constructed,and the evolutionary relationship of the strain was analyzed,so as to provide reference for exploring the pathogenic mechanism of APP and clinical prevention and control of porcine infectious porcine contagious pleuropneumia (PCP).【Method】 The drug resistance spectrum of the isolated strains was determined by drug sensitivity test. The whole genome of bacterial DNA was sequenced by whole genome sequencing (WGS) method.Based on Illumina NovaSeq and PacBio SequeI sequencing platforms,the whole genome sequencing results were analyzed by gene function annotation and bioinformatics analysis (including basic genome information,functional element analysis and subsystem analysis,etc.). Phylogenetic tree was constructed based on ApxⅣ gene.【Result】 The results of drug sensitivity test of GD2107 strain showed that it was resistant to 14 kinds of antimicrobials including penicillin,cefradine (pioneer Ⅵ),kanamycin and so on.The whole genome of GD2107 strain was sequenced to obtain a circular chromosome of 2 271 987 bp (GC content was 41.21%) and two circular plasmids of 5 027 and 3 497 bp,respectively.A total of 2 290 coding genes were predicted,including 19 rRNA (7 5S rRNA,6 16S rRNA,6 23S rRNA),21 tRNA genes,20 ncRNA;23 gene islands,4 prophages and 2 groups of CRISPR related sequences.2 112,1 549 and 1 866 genes were annotated in the databases of COG,KEGG and GO,respectively,and the related proteins were mainly distributed in the metabolic process of APP.In addition,48 virulence genes and 22 drug resistance genes were annotated in VFDB and CARD databases (only floR gene was located on the plasmid).The whole genome circle map of the strain was drawn and the genome information was submitted to NCBI.The chromosome GenBank accession No. was CP097377 and the plasmids accession No. were CP097378 and CP097379, respectively. Phylogenetic tree analysis showed that the evolutionary relationship between this strain and APP strain from China (CP063424.1) was the closest.【Conclusion】 In this study, we completed the whole genome sequencing and bioinformatics analysis of the multi-drug resistant strain GD2107, fully understood the structure and function of the genome of the strain, and explored the related genes in drug resistance and pathogenic mechanism. The evolutionary relationship showed that the strain had a certain regional epidemic, which provided a reference for preventing the epidemic of PCP and exploring the pathogenic mechanism of APP.

Key words: Actinobacillus pleuropneumoniae (APP); whole genome sequencing; bioinformatics analysis; resistance genes; phylogenetic analysis

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