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Updated: Aug 19, 2026
Dissection of Drosophila Ovaries
Published on: October 19, 2006
dAkt kinase controls follicle cell size during Drosophila oogenesis
Valeria Cavaliere1, Alessandra Donati, Anita Hsouna
1Dipartimento di Biologia Evoluzionistica Sperimentale, Bologna, Italy. valeria.cavaliere@unibo.it
Abstract:
The Drosophila Akt (dAkt) serine/threonine kinase is a component of the insulin receptor/PI3K signaling pathway that regulates cell growth. Here, we show that this kinase is expressed during Drosophila oogenesis and is required for egg chamber development. Loss of dAkt function in follicle cells causes a cell-autonomous reduction of cell size while expression of the constitutively active myristylated form of this kinase (dAkt(myr)) causes increased cell size. Accordingly, expression of the antagonist dPTEN in the same follicular domains causes reduced follicle cell size. Perturbations of dAkt function do not affect follicle cell proliferation or cell death. Of interest, expression of dAkt(myr) in the posterior domain of the follicular epithelium causes a delay in the posterior movement of follicular epithelium and dumpless-like egg chambers. It appears that dAkt is required for maintaining the continuity of cell size within the follicular epithelium, which in turn is necessary for its proper morphogenesis.
Insights
Drosophila Akt (dAkt) kinase regulates cell growth and is crucial for egg chamber development. Its function maintains follicle cell size continuity, essential for proper egg chamber morphogenesis.
Area of Science:
- Cell Biology
- Developmental Biology
- Molecular Genetics
Background:
- The insulin receptor/phosphatidylinositol 3-kinase (PI3K) signaling pathway regulates cell growth.
- Drosophila Akt (dAkt) is a serine/threonine kinase within this pathway.
Purpose of the Study:
- To investigate the role of Drosophila Akt (dAkt) during oogenesis.
- To determine dAkt's function in egg chamber development and follicle cell morphology.
Main Methods:
- Utilized Drosophila melanogaster as a model organism.
- Manipulated dAkt function in follicle cells using genetic techniques.
- Observed effects on cell size, proliferation, cell death, and egg chamber movement.
Main Results:
- dAkt is expressed during oogenesis and is essential for egg chamber development.
- Loss of dAkt function reduces follicle cell size; constitutively active dAkt increases cell size.
- Perturbing dAkt does not affect follicle cell proliferation or apoptosis.
- Altered dAkt activity in the posterior follicular epithelium delays egg chamber movement.
Conclusions:
- Drosophila Akt (dAkt) plays a critical role in regulating follicle cell size during oogenesis.
- Maintaining cell size continuity via dAkt is necessary for proper egg chamber morphogenesis.
- dAkt is a key regulator of developmental processes in the Drosophila ovary.
