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Wild-type Drosophila melanogaster as an alternative model system for investigating the pathogenicity of Candida
Marcus T Glittenberg1, Sukrit Silas, Donna M MacCallum
1Genes and Development Laboratory, Department of Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 3QU, UK.
Abstract:
Candida spp. are opportunistic pathogens in humans, and their systemic infections display upwards of 30% mortality in immunocompromised patients. Current mammalian model systems have certain disadvantages in that obtaining results is time consuming owing to the relatively long life spans and these results have low statistical resolution because sample sizes are usually small. We have therefore evaluated the potential of Drosophila melanogaster as an additional model system with which to dissect the host-pathogen interactions that occur during Candida albicans systemic infection. To do this, we monitored the survival of wild-type flies infected with various C. albicans clinical isolates that were previously ranked for murine virulence. From our lifetime data we computed two metrics of virulence for each isolate. These correlated significantly with murine survival, and were also used to group the isolates, and this grouping made relevant predictions regarding their murine virulence. Notably, differences in virulence were not predictably resolvable using immune-deficient spz(-/-) flies, suggesting that Toll signalling might actually be required to predictably differentiate virulence. Our analysis reveals wild-type D. melanogaster as a sensitive and relevant model system; one that offers immense genetic tractability (having an extensive RNA interference library that enables tissue-specific gene silencing), and that is easy to manipulate and culture. Undoubtedly, it will prove to be a valuable addition to the model systems currently used to study C. albicans infection.
Insights
The fruit fly Drosophila melanogaster offers a rapid and effective model for studying Candida albicans infections. This model system provides valuable insights into host-pathogen interactions and predicts fungal virulence in mammals.
Area of Science:
- Mycology
- Infectious Diseases
- Model Organism Research
Background:
- Candida spp. are opportunistic human pathogens causing high mortality in immunocompromised individuals.
- Mammalian models for studying Candida infections are limited by long study durations and small sample sizes.
- There is a need for more efficient and statistically robust model systems.
Purpose of the Study:
- To evaluate Drosophila melanogaster as a model system for dissecting host-pathogen interactions during Candida albicans systemic infection.
- To assess the correlation between virulence metrics in Drosophila and murine models.
- To explore the role of Toll signaling in differentiating Candida virulence.
Main Methods:
- Monitoring survival rates of wild-type Drosophila melanogaster infected with various Candida albicans clinical isolates.
- Calculating virulence metrics from lifetime data and comparing them with murine survival data.
- Investigating virulence differences in immune-deficient spz(-/-) Drosophila.
Main Results:
- Drosophila melanogaster survival data significantly correlated with murine survival data.
- Virulence grouping of Candida isolates in flies accurately predicted their virulence in mice.
- Differences in virulence were not consistently observed in immune-deficient flies, suggesting Toll signaling's importance.
Conclusions:
- Wild-type Drosophila melanogaster is a sensitive, relevant, and genetically tractable model for studying Candida albicans infections.
- This model system facilitates rapid assessment of fungal virulence and host-pathogen interactions.
- Drosophila melanogaster offers a valuable addition to existing models for Candida research.
