alexa Nodal points and complexity of Notch-Ras signal integration.
Haematology

Haematology

Journal of Blood & Lymph

Author(s): Hurlbut GD, Kankel MW, ArtavanisTsakonas S

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Abstract Metazoans use a handful of highly conserved signaling pathways to create a signaling backbone that governs development. How these few signals have such a versatile action likely depends upon the larger-scale network they form through integration, as exemplified by cross-talk between the Notch and receptor tyrosine kinase (RTK) pathways. We examined the transcriptional output of Notch-RTK cross-talk during Drosophila development and present in vivo data supporting a role for selected mutually regulated genes in signal integration. Interestingly, Notch-RTK integration did not lead to general antagonism of either pathway, as is commonly believed. Instead, integration had a combinatorial effect on specific cross-regulated targets, which unexpectedly included numerous core components of the RTK and other major signaling pathways (TGF-beta, Hh, Jak/Stat, nuclear receptor and Wnt). We find the majority of Ras-responsive genes are also Notch-responsive, suggesting Notch may function to specify the response to Ras activation.
This article was published in Proc Natl Acad Sci U S A and referenced in Journal of Blood & Lymph

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