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Updated: Jul 15, 2026
Extraction of Hemocytes from Drosophila melanogaster Larvae for Microbial Infection and Analysis
Published on: May 24, 2018
Bacterial infection of fly ovaries reduces egg production and induces local hemocyte activation
Stephanie M Brandt1, David S Schneider
1Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA.
Abstract:
Morbidity, the state of being diseased, is an important aspect of pathogenesis that has gone relatively unstudied in fruit flies. Our interest is in characterizing how bacterial pathogenesis affects various physiologies of the fly. We chose to examine the fly ovary because we found bacterial infection had a striking effect on fly reproduction. We observed decreased egg laying after bacterial infection that correlated with increased bacterial virulence. We also found that bacteria colonized the ovary in a previously undescribed manner; bacteria were found in the posterior of the ovary, adjacent to the lateral oviduct. This local infection in the ovary resulted in melanization and activation of the cellular immune response at the site of infection.
Insights
Bacterial infection in fruit flies significantly reduces egg laying and impacts reproduction. Pathogens colonize the ovary, triggering a localized immune response and melanization.
Area of Science:
- Fruit fly (Drosophila melanogaster) research
- Insect pathology
- Invertebrate immunology
Background:
- Morbidity, a key aspect of pathogenesis, is understudied in fruit flies.
- Bacterial pathogenesis impacts various fly physiologies.
- The fly ovary is a critical reproductive organ susceptible to infection.
Purpose of the Study:
- To characterize how bacterial pathogenesis affects fruit fly physiology, specifically reproduction.
- To investigate the colonization patterns of bacteria within the fly ovary.
- To understand the immune response to ovarian bacterial infection.
Main Methods:
- Infection of fruit flies with bacteria.
- Quantification of egg laying to assess reproductive output.
- Microscopic examination to determine bacterial colonization sites.
- Analysis of immune responses, including melanization and cellular immunity.
Main Results:
- Bacterial infection led to decreased egg laying, correlating with increased bacterial virulence.
- Bacteria were observed colonizing the posterior ovary, near the lateral oviduct.
- Ovarian infection induced localized melanization and activation of the cellular immune response.
Conclusions:
- Bacterial pathogenesis significantly impairs fruit fly reproduction through ovarian infection.
- The fruit fly ovary serves as a site for bacterial colonization and subsequent immune activation.
- This study highlights morbidity as a crucial factor in insect pathogenesis and immunity.
