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A role for moesin in polarity

Kathryn G Miller1

  • 1Department of Biology, Campus Box 1229, Washington University, 1 Brookings Drive, St. Louis MO 63130, USA. miller@biology.wustl.edu

Trends in Cell Biology
|April 2, 2003
PubMed

Insights

Mutations in Drosophila Dmoesin, the only ezrin-radixin-moesin (ERM) protein, cause lethality and developmental defects. This highlights ERM proteins' crucial role in actin organization and cell polarity.

Area of Science:

  • Developmental biology
  • Cell biology
  • Genetics

Background:

  • Ezrin-radixin-moesin (ERM) proteins link the actin cytoskeleton to the plasma membrane.
  • Studies in cultured mammalian cells suggest ERM proteins are vital for actin-membrane associations.
  • Vertebrate ERM paralogs exhibit functional overlap, as mouse mutations in moesin and radixin do not cause severe defects.

Purpose of the Study:

  • To investigate the function of Dmoesin, the sole ERM protein in Drosophila, during development.
  • To characterize the developmental defects associated with Dmoesin mutations.
  • To understand the role of ERM proteins in actin organization and cell polarity.

Main Methods:

  • Genetic analysis of Dmoesin mutations in Drosophila.
  • Examination of actin organization in imaginal disc epithelia.
  • Analysis of Dmoesin function in the female germ-line.

Main Results:

  • Dmoesin mutations in Drosophila lead to lethality.
  • Abnormal actin organization and loss of apical-basal polarity were observed in imaginal disc epithelia.
  • Reduced moesin function in the germ-line caused defects in cortical actin organization and affected localization of informational molecules.

Conclusions:

  • Dmoesin is essential for Drosophila development, survival, and maintaining tissue polarity.
  • Drosophila Dmoesin plays a critical role in regulating actin organization and cell polarity.
  • Moesin is involved in anchoring determinants essential for proper oocyte development.

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