Extensive characterization of Campylobacter jejuni chicken isolates to uncover genes involved in the ability to compete for gut colonization

BMC Microbiology

Ann Letellier²  Sylvain Quessy²  Evelyne Guévremont³  Sylvette Laurent-Lewandowski¹  Eduardo N. Taboada⁴  Philippe Fravalo²  Alexandre Thibodeau² 

[1]Department of Pathology and Microbiology, Swine and Avian Infectious Disease Research Centre (CRIPA), University of Montreal, Veterinary Medicine Faculty, Saint-Hyacinthe, QC, Canada

[2]Department of Pathology and Microbiology, Groupe de recherche et d’enseignement en salubrité alimentaire (GRESA), University of Montreal, Veterinary Medicine Faculty, Saint-Hyacinthe, QC, Canada

[3]Agriculture and Agri-Food Canada, Food Research and Development Centre, St-Hyacinthe, QC, Canada

[4]Public Health Agency of Canada, Laboratory for Foodborne Zoonoses, Lethbridge, AB, Canada

关键词: Competition;    Adhesion and invasion;    Chemotaxis;    Autoagglutination;    CGF typing;    Colonization;    Chicken;    Campylobacter jejuni;   

Others  :  1212046
DOI  :  10.1186/s12866-015-0433-5

 received in 2014-11-24, accepted in 2015-04-30,  发布年份 2015

【 摘 要 】

Background

Campylobacter jejuni is responsible for human foodborne enteritis. This bacterium is a remarkable colonizer of the chicken gut, with some strains outcompeting others for colonization. To better understand this phenomenon, the objective of this study was to extensively characterize the phenotypic performance of C. jejuni chicken strains and associate their gut colonizing ability with specific genes.

Results

C. jejuni isolates (n = 45) previously analyzed for the presence of chicken colonization associated genes were further characterized for phenotypic properties influencing colonization: autoagglutination and chemotaxis as well as adhesion to and invasion of primary chicken caecal cells. This allowed strains to be ranked according to their in vitro performance. After their in vitro capacity to outcompete was demonstrated in vivo, strains were then typed by comparative genomic fingerprinting (CGF). In vitro phenotypical properties displayed a linear variability among the tested strains. Strains possessing higher scores for phenotypical properties were able to outcompete others during chicken colonization trials. When the gene content of strains was compared, some were associated with different phenotypical scores and thus with different outcompeting capacities. Use of CGF profiles showed an extensive genetic variability among the studied strains and suggested that the outcompeting capacity is not predictable by CGF profile.

Conclusion

This study revealed a wide array of phenotypes present in C. jejuni strains, even though they were all recovered from chicken caecum. Each strain was classified according to its in vitro competitive potential and its capacity to compete for chicken gut colonization was associated with specific genes. This study also exposed the disparity existing between genetic typing and phenotypical behavior of C. jejuni strains.

【 授权许可】

   
2015 Thibodeau et al.; licensee BioMed Central.

【 图 表 】

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