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Dmoesin controls actin-based cell shape and polarity during Drosophila melanogaster oogenesis
Cédric Polesello1, Isabelle Delon, Philippe Valenti
1Centre de Biologie du Dévelopement, UMR 5547 CNRS, Bat4R3, 118 route de Narbonne, Toulouse, 31062 CEDEX4, France.
Abstract:
Ezrin, Radixin and Moesin (ERM) proteins are thought to constitute a bridge between the actin cytoskeleton and the plasma membrane (PM). Here we report a genetic analysis of Dmoesin, the sole member of the ERM family in Drosophila. We show that Dmoesin is required during oogenesis for anchoring microfilaments to the oocyte cortex. Alteration of the actin cytoskeleton resulting from Dmoesin mutations impairs the localization of maternal determinants, thus disrupting antero-posterior polarity. This study also demonstrates the requirement of Dmoesin for the specific organization of cortical microfilaments in nurse cells and, consequently, mutations in Dmoesin produce severe defects in cell shape.
Insights
Drosophila Dmoesin protein anchors microfilaments to the oocyte cortex, crucial for establishing cell polarity. Mutations disrupt this, affecting maternal determinants and cell shape.
Area of Science:
- Cell Biology
- Developmental Biology
- Genetics
Background:
- Ezrin, Radixin, and Moesin (ERM) proteins link the actin cytoskeleton to the plasma membrane.
- ERM proteins play vital roles in cell structure and polarity.
Purpose of the Study:
- To genetically analyze Dmoesin, the Drosophila melanogaster ERM protein homolog.
- To investigate Dmoesin's role in oogenesis and cell organization.
Main Methods:
- Genetic analysis of Dmoesin mutations in Drosophila.
- Observation of Dmoesin's effects on the actin cytoskeleton and cell structure during oogenesis.
Main Results:
- Dmoesin is essential for anchoring microfilaments to the oocyte cortex.
- Dmoesin mutations disrupt the localization of maternal determinants, leading to polarity defects.
- Dmoesin is required for proper organization of cortical microfilaments in nurse cells, causing cell shape abnormalities.
Conclusions:
- Dmoesin is a key regulator of the actin cytoskeleton during Drosophila oogenesis.
- Dmoesin's function is critical for establishing antero-posterior polarity and maintaining cell morphology.