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Spatially dependent dynamic MAPK modulation by the Nde1-Lis1-Brap complex patterns mammalian CNS.

Alison A Lanctot¹, Chian-Yu Peng, Ashley S Pawlisz

¹Department of Neurology, Northwestern University Feinberg School of Medicine, 303 E. Superior Street, Chicago, IL 60611, USA.

Developmental Cell

|May 16, 2013

Summary

The Nde1-Lis1 complex controls cell fate in CNS development by modulating MAPK signaling. This complex ensures proper cell proliferation and differentiation based on location relative to signaling centers.

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Area of Science:

Neuroscience
Developmental Biology
Cell Biology

Background:

Central nervous system (CNS) development requires precise regulation of neural progenitor cell proliferation and differentiation.
Neural progenitors respond to complex signaling gradients from midline centers, making unique cell fate decisions.
The Nde1-Lis1 complex is implicated in cell fate determination during CNS development.

Purpose of the Study:

To investigate the role of the Nde1-Lis1 complex in mediating spatially dependent cell fate decisions in the developing CNS.
To elucidate the molecular mechanisms by which Nde1-Lis1 regulates responses to mitogenic signaling gradients.

Main Methods:

Analysis of Nde1-Lis1 double-mutant mice to assess CNS development.
Investigation of the interaction between Lis1 and Brap, a MAPK signaling modulator.
Examination of mitogen-activated protein kinase (MAPK) pathway components, including Ksr.

Main Results:

Nde1-Lis1 deficiency leads to spatially distinct defects: failure of self-renewal in distant cells and overproliferation in cells near signaling centers.
A direct interaction between Lis1 and Brap mediates differential responses to mitogenic gradients.
Nde1-Lis1 deficiency alters MAPK scaffold Ksr localization and causes MAPK hyperactivation in a spatially dependent manner.
Epistasis analyses confirm synergistic roles for Brap and Lis1.

Conclusions:

The Nde1-Lis1 complex, in conjunction with Brap, regulates the dynamic MAPK signaling threshold in a spatially dependent manner.
This molecular complex is crucial for precise control of neural progenitor proliferation and differentiation during CNS development.