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Science 30 January 2004:
Vol. 303. no. 5658, pp. 663 - 666
DOI: 10.1126/science.1091639
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Reports

Crosstalk Between the EGFR and LIN-12/Notch Pathways in C. elegans Vulval Development

Andrew S. Yoo,1* Carlos Bais,2* Iva Greenwald2{dagger}

The Caenorhabditis elegans vulva is an important paradigm for cell-cell interactions in animal development. The fates of six vulval precursor cells are patterned through the action of the epidermal growth factor receptor–mitogen-activated protein kinase (EGFR-MAPK) inductive signaling pathway, which specifies the 1° fate, and the LIN-12/Notch lateral signaling pathway, which specifies the 2° fate. Here, we provide evidence that the inductive signal is spatially graded and initially activates the EGFR-MAPK pathway in the prospective 2° cells. Subsequently, this effect is counteracted by the expression of multiple new negative regulators of the EGFR-MAPK pathway, under direct transcriptional control of the LIN-12–mediated lateral signal.

1 Integrated Program in Cellular, Molecular, and Biophysical Studies, Howard Hughes Medical Institute, Columbia University, College of Physicians and Surgeons, 701 West 168th Street, Room 720, New York, NY 10032, USA.
2 Department of Biochemistry and Molecular Biophysics, Howard Hughes Medical Institute, Columbia University, College of Physicians and Surgeons, 701 West 168th Street, Room 720, New York, NY 10032, USA.



* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: greenwald{at}cancercenter.columbia.edu

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