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Related Experiment Videos

Signal transduction by a protease cascade.

E K LeMosy1, C C Hong, C Hashimoto

  • 1Dept of Cell Biology, Yale University School of Medicine, New Haven, CT 06520, USA.

Trends in Cell Biology
|April 14, 1999
PubMed
Summary
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Drosophila embryo development relies on a spatial cue from ovarian cells. This cue activates a ventral-specific protease cascade, even after cell degeneration, guiding embryonic axis formation.

Area of Science:

  • Developmental biology
  • Molecular signaling
  • Genetics

Background:

  • The dorsoventral axis in Drosophila embryos is established by a spatial cue originating from ovarian somatic cells.
  • This cue is transmitted to the embryo via an extracellular serine protease cascade.
  • The protease cascade is specifically active on the ventral side of the embryo.

Purpose of the Study:

  • To propose a working model for the local activation of the serine protease cascade.
  • To understand how this activation occurs hours after the degeneration of ovarian somatic cells.
  • To elucidate the roles of specific proteases and somatically expressed proteins in this signaling pathway.

Main Methods:

  • Analysis of proteases involved in embryonic axis determination.

Related Experiment Videos

  • Investigation of somatically expressed proteins in Drosophila.
  • Development of a signaling model based on experimental data.

    • Main Results:

    • Identification of key proteases and proteins mediating the spatial cue.
    • A proposed mechanism for the delayed, localized activation of the protease cascade.
    • Insights into the temporal regulation of developmental signaling.

    Conclusions:

    • The serine protease cascade provides a robust mechanism for establishing embryonic polarity.
    • The system demonstrates a sophisticated interplay between cell signaling and developmental timing.
    • Further research can build upon this model to explore conserved developmental pathways.