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01-12-2020 | Ciprofloxacin | Research

Comparative genomics of Helicobacter pullorum from different countries

Authors: Guilan Zhou, Hao Liang, Yixin Gu, Changyan Ju, Lihua He, Pengbo Guo, Zhujun Shao, Jianzhong Zhang, Maojun Zhang

Published in: Gut Pathogens | Issue 1/2020

Abstract

Background

Helicobacter pullorum commonly colonized in the gastrointestinal tract of poultry and caused gastroenteritis. This bacterium could be transmitted to humans through contaminated food and caused colitis and hepatitis. Currently, the genetic characteristics of the H. pullorum were not recognized enough. In this study, the genomes of 23 H. pullorum strains from different counties were comparatively analyzed. Among them, H. pullorum 2013BJHL was the first isolated and reported in China.

Results

The genomes of the studied strains were estimated to vary from 1.55 to 2.03 Mb, with a GC content of ~ 34%. 4064 pan genes and 1267 core genes were obtained from the core-pan genome analysis using the Roary pipeline. Core genome SNPs (cg-SNPs) were obtained using Snippy4 software. Two groups were identified with the phylogenetic analysis based on the cg-SNPs. Some adhesion-related, immune regulation, motility-related, antiphagocytosis-related, toxin-related and quorum sensing related genes were identified as virulence factors. APH(3′)-IIIa, APH(2′’)-If, and AAC(6′)-Ie-APH(2′’)-Ia were identified as antibiotic resistance genes among the H. pullorum genomes. cat, SAT-4 and tetO genes were only identified in 2013BJHL, and tet(C) was identified in MIT98-5489. MIC determination revealed that the 2013BJHL showed acquired resistance to ciprofloxacin, nalidixic acid, tetracycline, gentamicin, streptomycin and erythromycin, only sensitive to ampicillin. The antibiotic resistance genetic determinants on the 2013BJHL genome correlate well with observed antimicrobial susceptibility patterns. Two types of VI secretion system (T6SS) were identified in 52.2% (12/23) the studied strains.

Conclusion

In this study, we obtained the genetic characteristics of H. pullorum from different sources in the world. The comprehensive genetic characteristics of H. pullorum were first described. H. pullorum showed highly genetic diversity and two sub-types of T6SSs were first identified in H. pullorum. 2013BJHL was found to be multidrug resistant as it was resistant to at least three different antibiotic classes.

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Title: Comparative genomics of Helicobacter pullorum from different countries
Authors: Guilan Zhou
Hao Liang
Yixin Gu
Changyan Ju
Lihua He
Pengbo Guo
Zhujun Shao
Jianzhong Zhang
Maojun Zhang
Publication date: 01-12-2020
Publisher: BioMed Central
Keywords: Ciprofloxacin
Erythromycin
Antibiotic
Tetracyclines
Published in: Gut Pathogens / Issue 1/2020
Electronic ISSN: 1757-4749
DOI: https://doi.org/10.1186/s13099-020-00394-1

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