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Planar polarity: converting a morphogen gradient into cellular polarity.

Giovanna M Collu1, Marek Mlodzik1

  • 1Department of Developmental & Regenerative Biology, and Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.

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Summary

Planar cell polarity orients epithelial cells using long-range signals. A specific kinase decodes morphogen gradients to control this cellular orientation.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Biophysics

Background:

  • Epithelial cells exhibit apico-basal and planar polarization.
  • Planar cell polarity (PCP) involves long-range orientation cues and local cell-cell interactions.
  • Understanding PCP mechanisms is crucial for tissue development and integrity.

Purpose of the Study:

  • To elucidate the mechanism of long-range gradient-type regulation in planar cell polarity.
  • To investigate how a kinase integrates morphogen gradient information for cellular orientation.

Main Methods:

  • Utilized computational modeling to simulate morphogen gradient effects.
  • Employed biochemical assays to study kinase activity in response to gradient inputs.
  • Performed live-cell imaging to observe cellular reorientation dynamics.

Main Results:

  • Identified a specific kinase as a key transducer of morphogen gradient signals.
  • Demonstrated that this kinase translates gradient information into directional cellular cues.
  • Showcased the role of this kinase in establishing long-range planar cell polarity.

Conclusions:

  • A kinase plays a critical role in interpreting extracellular signals for planar cell polarity.
  • This mechanism provides new insights into how morphogen gradients guide epithelial cell orientation.
  • Findings contribute to understanding developmental processes regulated by cell polarity.