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Torso RTK controls Capicua degradation by changing its subcellular localization

Oliver Grimm1, Victoria Sanchez Zini, Yoosik Kim

  • 1Howard Hughes Medical Institute, Department of Molecular Biology, Princeton University, Princeton, NJ 08544, USA.

Development (Cambridge, England)
|October 11, 2012
PubMed

Insights

Torso receptor tyrosine kinase (RTK) signaling promotes Capicua (Cic) protein degradation by altering its movement between the nucleus and cytoplasm during early Drosophila development. This mechanism explains how RTKs control Cic stability.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • The transcriptional repressor Capicua (Cic) is crucial for Drosophila embryogenesis and linked to vertebrate development and human diseases.
  • Receptor tyrosine kinases (RTKs) antagonize Cic-mediated gene repression, but the underlying mechanisms remain unclear.

Purpose of the Study:

  • To investigate how Torso RTK signaling influences Cic activity and stability during early Drosophila embryogenesis.
  • To elucidate the subcellular mechanisms by which RTK signaling modulates Cic function.

Main Methods:

  • Utilized genetic studies in early Drosophila embryos.
  • Employed live imaging techniques to observe Cic localization and dynamics.
  • Analyzed the impact of Torso signaling on Cic nucleocytoplasmic transport and degradation.

Main Results:

  • Torso RTK signaling accelerates the degradation rate of Cic.
  • This acceleration is achieved by altering Cic's subcellular localization, promoting its export from the nucleus.
  • Torso signaling controls the rates of Cic's nucleocytoplasmic transport, leading to reduced protein stability.

Conclusions:

  • A model is proposed where Cic is primarily degraded in the cytoplasm.
  • Torso RTK signaling enhances Cic degradation by modulating its nucleocytoplasmic shuttling.
  • This mechanism provides insight into RTK-dependent regulation of Cic in various developmental contexts.

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