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The NF2 tumor suppressor, Merlin, regulates epidermal development through the establishment of a junctional polarity

Andrew B Gladden1, Alan M Hebert, Eveline E Schneeberger

  • 1Massachusetts General Hospital Cancer Center, Charlestown, MA 02129, USA.

Developmental Cell
|November 16, 2010
PubMed

Insights

The neurofibromatosis type 2 (NF2) tumor suppressor, Merlin, is crucial for cell-cell junction stability. Merlin directly links adherens junctions to the Par3 polarity complex, essential for proper cell communication and tissue development.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Neurofibromatosis type 2 (NF2) tumor suppressor Merlin is a FERM domain protein.
  • Merlin loss causes defective morphogenesis and tumorigenesis.
  • Merlin mediates contact-dependent inhibition of proliferation and adherens junction (AJ) stability.

Purpose of the Study:

  • To delineate the molecular function of Merlin in AJ establishment in epidermal keratinocytes.
  • To confirm Merlin's essential role in AJ establishment in vivo.

Main Methods:

  • In vitro studies using epidermal keratinocytes.
  • In vivo validation of Merlin's function in AJ establishment.

Main Results:

  • Merlin directly associates with α-catenin.
  • Merlin links α-catenin to the Par3 polarity complex.
  • This association is essential for junctional maturation.

Conclusions:

  • Merlin provides a critical link between adherens junctions and the Par3 polarity complex.
  • Merlin's function in AJ establishment is essential for tissue development and preventing tumorigenesis.

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