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Updated: May 23, 2026
Oral Bacterial Infection and Shedding in Drosophila melanogaster
Published on: May 31, 2018
Drosophila melanogaster mitigates gastro-oral infections by stimulating pathogen expulsion
Shreya Verma1, Sushovan Bhattacharyya1, Meghana Tare2
1Department of Biological Sciences, Birla Institute of Technology and Science, Pilani, Rajasthan, 333031, India.
Background:
Food-borne pathogens, particularly belonging to the Enterobacteriaceae family, are a major cause of gastrointestinal infections in humans. While Drosophila melanogaster has been widely explored to study antimicrobial responses, most studies rely on septic injury or direct injection routes that bypass the gut. A coordinated set of antimicrobial defenses acts to counteract the invading bacteria, with some variations depending on the entry route into the host. Herein, we tracked the dynamics of Enterobacteriaceae pathogens in Drosophila using a natural infection route.
Results:
Most bacterial species were cleared within 48 h post-infection (hpi). We did not observe any significant mortality, indicating robust infection control. At 4 hpi, a substantial increase in reactive oxygen species (ROS) production was observed, followed by a decrease at 24 hpi and a resurgence at 48 hpi. We further show that bacteria were expelled by the fly, possibly due to TRPA1 induction, a ROS-sensing receptor. Although the infected dual oxidase (Duox) knockdown flies showed no difference in survival rate compared to the uninfected ones, they showed differential TRPA1 induction and pathogen expulsion, suggesting that ROS alone is insufficient for TRPA1 induction and infection control.
Conclusions:
Our findings reveal that the host can distinguish and respond to various bacterial species in a well-synchronized, gut-localized, and pathogen-specific manner. This also illustrates the reliability of natural infection route models in unravelling and understanding the complexities of host-pathogen interaction.
Insights
Fruit flies effectively clear food-borne Enterobacteriaceae pathogens within 48 hours using a natural gut infection route. This study reveals synchronized, gut-localized host responses, highlighting the reliability of natural infection models.
Area of Science:
- Microbiology
- Immunology
- Genetics
Background:
- Enterobacteriaceae are common food-borne pathogens causing human gastrointestinal infections.
- Drosophila melanogaster is a model organism for studying antimicrobial responses.
- Existing research often bypasses the gut, using septic injury or injection routes.
Purpose of the Study:
- To investigate Enterobacteriaceae pathogen dynamics in Drosophila using a natural gut infection route.
- To understand host-pathogen interactions and antimicrobial defenses via oral ingestion.
- To evaluate the role of reactive oxygen species (ROS) and TRPA1 in infection control.
Main Methods:
- Oral infection of Drosophila melanogaster with Enterobacteriaceae.
- Monitoring bacterial clearance and host survival rates.
- Measuring reactive oxygen species (ROS) production.
- Investigating the role of TRPA1 and dual oxidase (Duox) in pathogen expulsion.
Main Results:
- Most bacterial species were cleared within 48 hours post-infection (hpi).
- No significant mortality was observed, indicating effective host infection control.
- Reactive oxygen species (ROS) production peaked at 4 hpi, decreased at 24 hpi, and resurged at 48 hpi.
- Pathogen expulsion was observed, potentially mediated by TRPA1 induction.
- Dual oxidase (Duox) knockdown affected TRPA1 induction and pathogen expulsion, but not survival, suggesting ROS is insufficient for full infection control.
Conclusions:
- Drosophila exhibits synchronized, gut-localized, and pathogen-specific responses to Enterobacteriaceae.
- The natural infection route model reliably reveals complexities in host-pathogen interactions.
- Host defense mechanisms involve pathogen recognition, ROS production, and expulsion pathways.
