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Updated: Feb 5, 2026
Measurement of Lifespan in Drosophila melanogaster
Published on: January 7, 2013
Microbial Quantity Impacts Drosophila Nutrition, Development, and Lifespan
Erin S Keebaugh1, Ryuichi Yamada1, Benjamin Obadia2
1Department of Neuroscience, The Scripps Research Institute, Jupiter, FL 33458, USA; Center on Aging, The Scripps Research Institute, Jupiter, FL 33458, USA.
Abstract:
In Drosophila, microbial association can promote development or extend life. We tested the impact of microbial association during malnutrition and show that microbial quantity is a predictor of fly longevity. Although all tested microbes, when abundantly provided, can rescue lifespan on low-protein diet, the effect of a single inoculation seems linked to the ability of that microbial strain to thrive under experimental conditions. Microbes, dead or alive, phenocopy dietary protein, and the calculated dependence on microbial protein content is similar to the protein requirements determined from fly feeding studies, suggesting that microbes enhance host protein nutrition by serving as protein-rich food. Microbes that enhance larval growth are also associated with the ability to better thrive on fly culture medium. Our results suggest an unanticipated range of microbial species that promote fly development and longevity and highlight microbial quantity as an important determinant of effects on physiology and lifespan during undernutrition.
Insights
Microbial quantity predicts fly longevity during malnutrition. Microbes act as a protein-rich food source, enhancing nutrition and promoting development and lifespan, even when dead.
Area of Science:
- Microbiology
- Genetics
- Nutrition Science
Background:
- Microbial associations in Drosophila can influence host development and lifespan.
- The role of microbes during periods of host malnutrition remains incompletely understood.
Purpose of the Study:
- To investigate the impact of microbial association on Drosophila longevity and development during malnutrition.
- To determine if microbial quantity or specific microbial strains are key determinants of beneficial effects.
Main Methods:
- Drosophila melanogaster were subjected to malnutrition (low-protein diet).
- Various microbial species were inoculated at different quantities.
- Lifespan, larval growth, and microbial colonization were assessed.
Main Results:
- Microbial quantity was a significant predictor of fly longevity under malnutrition.
- Abundant microbial presence, regardless of species, could rescue lifespan on a low-protein diet.
- Microbes, viable or not, mimicked dietary protein, suggesting they serve as a protein source.
- Microbial strains that thrived in the culture medium also enhanced larval growth.
Conclusions:
- Microbial quantity is a critical factor influencing Drosophila physiology and lifespan during undernutrition.
- Microbes enhance host nutrition by providing essential protein, acting as a food source.
- A diverse range of microbial species can promote fly development and longevity when present in sufficient amounts.
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