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Measuring O2 Consumption in Drosophila Melanogaster using Coulometric Microrespirometry
Sophia R Ford1, Jose Ildefonso Flores1, David J Sandstrom2
1Department of Biology, University of Maryland, College Park, Universities at Shady Grove.
Journal of Visualized Experiments : Jove
|July 24, 2023
Summary
Coulometric microrespirometry effectively measures oxygen consumption in Drosophila melanogaster. This method revealed that while mass-specific oxygen use was similar, CASK mutants showed reduced oxygen consumption per fly due to smaller size.
Area of Science:
- Physiology
- Genetics
- Biochemistry
Background:
- Coulometric microrespirometry is a cost-effective technique for measuring oxygen (O2) consumption in small organisms.
- The method involves an airtight chamber where O2 consumption leads to a pressure drop, triggering electrolytic O2 production proportional to charge used.
Purpose of the Study:
- To adapt and optimize coulometric microrespirometry for measuring O2 consumption in Drosophila melanogaster.
- To assess the metabolic rates of CASK mutants in comparison to wildtype controls.
Main Methods:
- Adaptation of coulometric microrespirometry for small groups of Drosophila melanogaster.
- Optimization of apparatus sensitivity and environmental conditions for stable measurements.
- Measurement of O2 consumption in wildtype and CASK mutant flies.
Main Results:
- Oxygen consumption measurements in wildtype flies were consistent with previous studies.
- Mass-specific O2 consumption did not differ between CASK mutants and congenic controls.
- CASK mutants exhibited significantly reduced O2 consumption per fly, attributed to their smaller size.
Conclusions:
- Coulometric microrespirometry is a viable tool for measuring O2 consumption in Drosophila melanogaster.
- The method can detect modest metabolic differences between genotypes.
- This technique offers a versatile approach for studying metabolic rates in small organisms.
