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Updated: Jun 10, 2026
Systemic Bacterial Infection and Immune Defense Phenotypes in Drosophila Melanogaster
Published on: May 13, 2015
Drosophila melanogaster as a model host for the Burkholderia cepacia complex
Josée Castonguay-Vanier1, Ludovic Vial, Julien Tremblay
1Institut National de la Recherche Scientifique-Institut Armand Frappier, Laval, Canada.
Background:
Colonization with bacterial species from the Burkholderia cepacia complex (Bcc) is associated with fast health decline among individuals with cystic fibrosis. In order to investigate the virulence of the Bcc, several alternative infection models have been developed. To this end, the fruit fly is increasingly used as surrogate host, and its validity to enhance our understanding of host-pathogen relationships has been demonstrated with a variety of microorganisms. Moreover, its relevance as a suitable alternative to mammalian hosts has been confirmed with vertebrate organisms.
Methodology/Principal Findings:
The aim of this study was to establish Drosophila melanogaster as a surrogate host for species from the Bcc. While the feeding method proved unsuccessful at killing the flies, the pricking technique did generate mortality within the populations. Results obtained with the fruit fly model are comparable with results obtained using mammalian infection models. Furthermore, validity of the Drosophila infection model was confirmed with B. cenocepacia K56-2 mutants known to be less virulent in murine hosts or in other alternative models. Competitive index (CI) analyses were also performed using the fruit fly as host. Results of CI experiments agree with those obtained with mammalian models.
Conclusions/Significance:
We conclude that Drosophila is a useful alternative infection model for Bcc and that fly pricking assays and competition indices are two complementary methods for virulence testing. Moreover, CI results indicate that this method is more sensitive than mortality tests.
Insights
The fruit fly, Drosophila melanogaster, serves as a valuable alternative model for studying Burkholderia cepacia complex (Bcc) virulence. Fly pricking assays and competition index tests offer sensitive methods for assessing Bcc pathogenicity.
Area of Science:
- Microbiology
- Infectious Diseases
- Model Organisms
Background:
- Burkholderia cepacia complex (Bcc) colonization accelerates health decline in cystic fibrosis patients.
- Investigating Bcc virulence necessitates effective infection models.
- The fruit fly (Drosophila melanogaster) is an emerging surrogate host for studying host-pathogen dynamics.
Purpose of the Study:
- To establish Drosophila melanogaster as a viable infection model for Bcc species.
- To evaluate the efficacy of different infection methods in fruit flies for Bcc studies.
- To compare virulence data from the fruit fly model with established mammalian models.
Main Methods:
- Drosophila melanogaster were infected with Bcc using feeding and pricking techniques.
- Virulence was assessed by observing fly mortality rates.
- Competitive index (CI) analyses were performed using the fruit fly model.
Main Results:
- The pricking method, unlike feeding, induced significant mortality in fruit fly populations.
- Drosophila infection model results correlated with findings from mammalian infection models.
- B. cenocepacia K56-2 mutants, known for reduced virulence, showed similar behavior in flies as in mammals.
Conclusions:
- Drosophila melanogaster is a suitable alternative model for Bcc virulence studies.
- Fly pricking assays and CI analyses are complementary methods for Bcc virulence testing.
- Competitive index assays are more sensitive for virulence assessment than mortality tests.
