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Drosophila FoxP mutants are deficient in operant self-learning
Ezequiel Mendoza1, Julien Colomb2, Jürgen Rybak3
1Inst. Biol. - Behavioral Biology, Freie Universität Berlin, Berlin, Germany.
Plos One
|June 26, 2014
Summary
The Forkhead Box P2 (FOXP2) gene is crucial for motor learning and language. Its fruit fly orthologue, dFoxP, is essential for operant self-learning, suggesting a deep evolutionary link between these abilities.
Area of Science:
- Neuroscience
- Evolutionary Biology
- Genetics
Background:
- The Forkhead Box P2 (FOXP2) gene is vital for human speech and language development.
- Its functions extend to vocal and motor learning in various species.
- Homology among FoxP genes suggests an ancient role in motor learning circuitry.
Purpose of the Study:
- To investigate the role of the Drosophila melanogaster orthologue, dFoxP, in motor learning.
- To explore the evolutionary origins of motor learning and language acquisition.
Main Methods:
- Genetic manipulation of the dFoxP locus in Drosophila.
- Analysis of operant self-learning and habit formation behaviors.
- RNA interference (RNAi) to modulate dFoxP expression levels.
- Examination of brain anatomy, including optic glomeruli volume.
Main Results:
- dFoxP disruption impaired operant self-learning and habit formation.
- dFoxP was dispensable for operant world-learning (without motor learning).
- Mutant flies exhibited subtle brain anatomy alterations, including reduced optic glomeruli.
- RNAi-mediated interference replicated the mutant behavioral phenotype.
Conclusions:
- Motor learning and language acquisition share a common, ancient evolutionary trait.
- This trait is evident in invertebrate operant self-learning, indicating deep homology.
- The findings suggest the ancestral FoxP gene was integral to motor learning circuitry before vertebrate-invertebrate divergence.
