Mothers against dpp participates in a DDP/TGF-beta responsive serine-threonine kinase signal transduction cascade.
نویسندگان
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.
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...
متن کاملXenopus mothers against decapentaplegic is an embryonic ventralizing agent that acts downstream of the BMP-2/4 receptor.
Dorsal-ventral patterning in vertebrate embryos is regulated by members of the TGF-beta family of growth and differentiation factors. In Xenopus the activins and Vg1 are potent dorsal mesoderm inducers while members of the bone morphogenetic protein (BMP) subclass pattern ventral mesoderm and regulate ectodermal cell fates. Receptors for ligands in the TGF-beta superfamily are serine-threonine ...
متن کاملMothers against dpp encodes a conserved cytoplasmic protein required in DPP/TGF-beta responsive cells.
The proteins necessary for signal transduction in cells responding to ligands of the TGF-beta family are largely unknown. We have previously identified Mad (Mothers against dpp), a gene that interacts with the TGF-beta family member encoded by decapentaplegic (dpp) in Drosophila. Assay of Mad's role in the DPP-dependent events of embryonic midgut development demonstrates that Mad is required fo...
متن کاملGenetic analysis of punt, a type II Dpp receptor that functions throughout the Drosophila melanogaster life cycle.
TGF-beta (transforming growth factor-beta-) mediated signal transduction affects growth and patterning in a variety of organisms. Here we report a genetic characterization of the Drosophila punt gene that encodes a type II serine/threonine kinase TGF-beta/Dpp (Decapentaplegic) receptor. Although the punt gene was originally identified based on its requirement for embryonic dorsal closure, we ha...
متن کاملschnurri is required for drosophila Dpp signaling and encodes a zinc finger protein similar to the mammalian transcription factor PRDII-BF1
Cytokines of the TGF beta superfamily regulate many aspects of cellular function by activating receptor complexes consisting of two distantly related serine/threonine kinases. Previous studies have indicated that Drosophila dpp uses similar signaling complexes and strictly requires the punt and thick veins receptors to transduce the signal across the membrane. Here, we show that the schnurri (s...
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ورودعنوان ژورنال:
- Development
دوره 124 16 شماره
صفحات -
تاریخ انتشار 1997