Abstract
Regulating cell proliferation and differentiation in CNS development requires both extraordinary complexity and precision. Neural progenitors receive graded overlapping signals from midline signaling centers, yet each makes a unique cell fate decision in a spatiotemporally restricted pattern. The Nde1-Lis1 complex regulates individualized cell fate decisions based on the geographical location with respect to the midline. While cells distant from the midline fail to self-renew in the Nde1-Lis1 double-mutant CNS, cells embedded in the signaling centers showed marked overproliferation. A direct interaction between Lis1 and Brap, a mitogen-activated protein kinase (MAPK) signaling threshold modulator, mediates this differential response to mitogenic signal gradients. Nde1-Lis1 deficiency resulted in a spatially dependent alteration of MAPK scaffold Ksr and hyperactivation of MAPK. Epistasis analyses supported synergistic Brap and Lis1 functions. These results suggest that a molecular complex composed of Nde1, Lis1, and Brap regulates the dynamic MAPK signaling threshold in a spatially dependent fashion.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 241-255 |
| Number of pages | 15 |
| Journal | Developmental Cell |
| Volume | 25 |
| Issue number | 3 |
| DOIs | |
| State | Published - May 13 2013 |
Funding
We would like to thank A. Wynshaw-Boris (UCSF) for the Lis1 mutant mouse, D. Smith (South Carolina) and J. Johnson (UT Southwestern) for antibodies, R. Awtramani (Northwestern University) for sharing messenger RNA probes for in situ hybridization, and Dritan Agalliu (UC Irvine) for helpful discussions during the earlier stage of this work. This work was supported by startup funding from Northwestern University and by NICHD grant R01HD56380 (to Y.F.).
ASJC Scopus subject areas
- General Biochemistry, Genetics and Molecular Biology
- Molecular Biology
- Cell Biology
- Developmental Biology