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Updated: Feb 17, 2026
Oral Bacterial Infection and Shedding in Drosophila melanogaster
Published on: May 31, 2018
Differential Microbial Diversity in Drosophila melanogaster: Are Fruit Flies Potential Vectors of Opportunistic
Luis A Ramírez-Camejo1,2, Génesis Maldonado-Morales2, Paul Bayman2
1Centro de Biodiversidad y Descubrimiento de Drogas, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Edificio 219, Ciudad del Saber, Apartado 0843-01103, Ciudad de Panamá, Panama.
Abstract:
Drosophila melanogaster has become a model system to study interactions between innate immunity and microbial pathogens, yet many aspects regarding its microbial community and interactions with pathogens remain unclear. In this study wild D. melanogaster were collected from tropical fruits in Puerto Rico to test how the microbiota is distributed and to compare the culturable diversity of fungi and bacteria. Additionally, we investigated whether flies are potential vectors of human and plant pathogens. Eighteen species of fungi and twelve species of bacteria were isolated from wild flies. The most abundant microorganisms identified were the yeast Candida inconspicua and the bacterium Klebsiella sp. The yeast Issatchenkia hanoiensis was significantly more common internally than externally in flies. Species richness was higher in fungi than in bacteria, but diversity was lower in fungi than in bacteria. The microbial composition of flies was similar internally and externally. We identified a variety of opportunistic human and plant pathogens in flies such as Alcaligenes faecalis, Aspergillus flavus, A. fumigatus, A. niger, Fusarium equiseti/oxysporum, Geotrichum candidum, Klebsiella oxytoca, Microbacterium oxydans, and Stenotrophomonas maltophilia. Despite its utility as a model system, D. melanogaster can be a vector of microorganisms that represent a potential risk to plant and public health.
Insights
Wild fruit flies (Drosophila melanogaster) harbor diverse bacteria and fungi, including human and plant pathogens. This highlights their potential role as disease vectors, impacting public and plant health.
Area of Science:
- Microbiology
- Insect Ecology
- Public Health
Background:
- Drosophila melanogaster is a key model for innate immunity research.
- Understanding its microbial community and pathogen interactions is crucial.
- Gaps exist in knowledge regarding fly microbiota and disease vector potential.
Purpose of the Study:
- Characterize the culturable bacterial and fungal diversity in wild Drosophila melanogaster.
- Investigate the distribution of microbiota (internal vs. external).
- Assess the potential of these flies as vectors for human and plant pathogens.
Main Methods:
- Wild Drosophila melanogaster were collected from tropical fruits in Puerto Rico.
- Fungi and bacteria were isolated and identified using culturing techniques.
- Microbial composition was compared between internal and external fly samples.
Main Results:
- Eighteen fungal and twelve bacterial species were isolated.
- Candida inconspicua (yeast) and Klebsiella sp. (bacterium) were most abundant.
- Issatchenkia hanoiensis yeast was more prevalent internally; microbial composition was similar internally and externally.
- Multiple opportunistic human and plant pathogens were identified, including Aspergillus, Fusarium, and Klebsiella species.
Conclusions:
- Wild Drosophila melanogaster host a diverse microbiota, including significant human and plant pathogens.
- The flies exhibit potential as vectors for various microorganisms.
- This finding underscores a potential risk to plant and public health, despite Drosophila's model system utility.
