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The Drosophila BMPRII, wishful thinking, is required for eggshell patterning.

Robert A Marmion1, Milica Jevtic, Alexander Springhorn

  • 1Department of Biology and Center for Computational and Integrative Biology, Rutgers, The State University of NJ, Camden, NJ, USA.

Developmental Biology
|January 1, 2013
PubMed
Summary

The bone morphogenetic protein (BMP) type II receptor, wishful thinking (wit), is crucial for Drosophila eggshell development. Loss of wit disrupts BMP signaling and alters eggshell morphology in epithelial cells.

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Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Molecular Genetics

Background:

  • The Drosophila eggshell is formed by follicular epithelial cells surrounding the oocyte.
  • Bone morphogenetic protein (BMP) signaling is vital for eggshell patterning and morphogenesis.
  • While the BMP type I receptor (thickveins) is well-studied, the BMP type II receptor's role in oogenesis remained unclear.

Purpose of the Study:

  • To investigate the role of wishful thinking (wit), the Drosophila homolog of BMP type II receptor, in oogenesis.
  • To determine if wit is involved in BMP signaling during eggshell formation.

Main Methods:

  • Examined wit gene expression patterns in Drosophila melanogaster follicular cells.
  • Assessed the necessity of WIT for BMP signaling using genetic perturbations.

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Last Updated: May 15, 2026

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  • Analyzed the impact of altered WIT function on eggshell morphology.

    • Main Results:

    • Wit exhibits dynamic, evolutionarily conserved expression in follicular cells, correlating with BMP signaling activity.
    • Wit is a target of BMP signaling and essential for its proper function.
    • Loss of wit function leads to cell-autonomous defects in BMP signaling and abnormal eggshell structures.

    Conclusions:

    • Wishful thinking (wit) functions as the BMP type II receptor in Drosophila oogenesis.
    • WIT is indispensable for BMP-mediated patterning and morphogenesis of the eggshell.
    • This study reveals a novel role for WIT in the development of epithelial cells during oogenesis.