Fluoxetine-resistant mutants in C. elegans define a novel family of transmembrane proteins
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Updated: Aug 18, 2026
Paradigms for Pharmacological Characterization of C. elegans Synaptic Transmission Mutants
Published on: August 18, 2008
1Program in Molecular and Cellular Biology, University of Washington, Seattle 98195, USA.
Abstract:
Fluoxetine (Prozac) is an antidepressant that is thought to act by blocking presynaptic reuptake of the neurotransmitter serotonin. Despite widespread clinical use of fluoxetine, direct evidence for this mechanism has been difficult to obtain in vivo. We have determined that fluoxetine has an additional neuromuscular effect on C. elegans that is distinct from inhibition of serotonin reuptake. By screening for mutants resistant to this effect, we have identified seven genes. We report that two of these genes are homologous to each other and define a novel gene family that encodes over a dozen multipass transmembrane proteins. Our findings may have clinical implications for the mechanism of action of fluoxetine.
Insights
Fluoxetine, an antidepressant, has a newly discovered neuromuscular effect in C. elegans separate from its known serotonin action. This finding, identified through genetic screening, may impact understanding fluoxetine
Area of Science:
- Neuroscience
- Genetics
- Pharmacology
Background:
- Fluoxetine (Prozac) is a widely prescribed antidepressant.
- Its primary mechanism is believed to be serotonin reuptake inhibition.
- Direct in vivo evidence for this mechanism remains limited.
Purpose of the Study:
- To investigate the in vivo mechanism of action of fluoxetine.
- To identify novel genes and pathways involved in fluoxetine's effects.
Main Methods:
- Utilized the model organism C. elegans.
- Screened for mutants resistant to a specific neuromuscular effect of fluoxetine.
- Performed genetic analysis to identify and characterize involved genes.
Main Results:
- Fluoxetine exhibits a neuromuscular effect in C. elegans independent of serotonin reuptake inhibition.
- Seven genes conferring resistance to this effect were identified.
- Two of these genes are homologous, defining a novel gene family encoding multipass transmembrane proteins.
Conclusions:
- Fluoxetine possesses a distinct neuromuscular mechanism of action.
- A novel gene family involved in this mechanism has been discovered.
- These findings may have significant clinical implications for fluoxetine's therapeutic action.
