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Upright Imaging of Drosophila Egg Chambers
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dSTAM expression pattern during wild type and mutant egg chamber development in D. melanogaster.

Alessia Galasso1, Luna S Pane, Michela Russo

  • 1IGB-ABT, Via P. Castellino 111, 80131 Naples, Italy.

Gene Expression Patterns : GEP
|August 1, 2007
PubMed
Summary

Signal-transducing adaptor molecule (STAM) protein is expressed throughout Drosophila oogenesis. Its localization within the oocyte is independent of microtubule polarity but is significantly altered in cup mutant oocytes.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Genetics

Background:

  • Signal-transducing adaptor molecule (STAM) is a conserved protein involved in cellular signaling pathways.
  • STAM proteins contain VHS, ubiquitin-interacting, and Src homology-3 domains, suggesting diverse interaction capabilities.

Purpose of the Study:

  • To investigate the expression pattern and protein localization of STAM during Drosophila melanogaster oogenesis.
  • To determine the factors influencing STAM localization, including microtubule network polarity and specific gene mutations.

Main Methods:

  • Analysis of stam gene transcript distribution during egg chamber development.
  • Immunolocalization studies to determine dSTAM protein presence and accumulation sites.
  • Examination of dSTAM localization in mutant Drosophila oocytes (grk and cup mutants).

Main Results:

  • The stam transcript is present in germ-line cells throughout oogenesis, with dSTAM protein detected early in germarial region 2 and accumulating in the oocyte.
  • dSTAM localizes to the perinuclear region of nurse cells and somatic polar follicular cells, and becomes enriched posteriorly in the oocyte, concentrating at the posterior pole before stage 10b.
  • dSTAM localization in the oocyte is not dependent on microtubule network polarity (grk mutant) but is significantly disrupted in cup mutant oocytes, showing central accumulation.

Conclusions:

  • dSTAM plays a role in Drosophila oogenesis, with a dynamic expression and localization pattern.
  • The posterior localization of dSTAM is regulated by factors independent of microtubule polarity and is critically dependent on the cup gene product.