Mothers against dpp participates in a DDP/TGF-beta responsive serine-threonine kinase signal transduction cascade.

نویسندگان

  • S J Newfeld
  • A Mehra
  • M A Singer
  • J L Wrana
  • L Attisano
  • W M Gelbart
چکیده

Mothers against dpp (Mad) is the prototype of a family of genes required for signaling by TGF-beta related ligands. In Drosophila, Mad is specifically required in cells responding to Decapentaplegic (DPP) signals. We further specify the role of Mad in DPP-mediated signaling by utilizing tkvQ199D, an activated form of the DPP type I receptor serine-threonine kinase thick veins (tkv). In the embryonic midgut, tkvQ199D mimics DPP-mediated inductive interactions. Homozygous Mad mutations block signaling by tkvQ199D. Appropriate responses to signaling by tkvQ199D are restored by expression of MAD protein in DPP-target cells. Endogenous MAD is phosphorylated in a ligand-dependent manner in Drosophila cell culture. DPP overexpression in the embryonic midgut induces MAD nuclear accumulation; after withdrawal of the overexpressed DPP signal, MAD is detected only in the cytoplasm. However, in three different tissues and developmental stages actively responding to endogenous DPP, MAD protein is detected in the cytoplasm but not in the nucleus. From these observations, we discuss possible roles for MAD in a DPP-dependent serine-threonine kinase signal transduction cascade integral to the proper interpretation of DPP signals.

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منابع مشابه

Mothers against dpp participates in a DPP/TGF-β responsive serine-threonine kinase signal transduction cascade

Stuart J. Newfeld1, Arun Mehra2, Matthew A. Singer1, Jeffrey L. Wrana3, Liliana Attisano2 and William M. Gelbart1,* 1Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA 2Department of Anatomy and Cell Biology, University of Toronto, Toronto, ON, Canada, M5S 1A8 3Program in Developmental Biology, The Hospital for Sick Children, Toronto, ON, Canad...

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عنوان ژورنال:
  • Development

دوره 124 16  شماره 

صفحات  -

تاریخ انتشار 1997