Abstract
Dishevelled (Dsh) is required for the specification of cell fate and polarity by secreted Wnt proteins. Frodo, a novel conserved Dsh-binding protein, synergized with Xenopus Dsh (XDsh) in secondary axis induction in Xenopus laevis embryos. A dominant inhibitory construct and antisense oligonucleotide-mediated depletion of Frodo inhibited axial development in response to XDsh and XWnt8, and suppressed transcriptional activation of a reporter construct. At later embryonic stages, both dominant negative Frodo and antisense oligonucleotides interfered with the expression of regional neural markers and caused eye deficiencies, indicating that Frodo is required for normal eye and neural tissue development. Full-length Frodo RNA suppressed these loss-of-function phenotypes, attesting to their specificity. These findings establish a function for Frodo as an essential positive regulator of Wnt signalling.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Adaptor Proteins, Signal Transducing
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Amino Acid Sequence
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Animals
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Body Patterning
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Carrier Proteins / chemistry
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Carrier Proteins / genetics
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Carrier Proteins / metabolism*
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Cytoskeletal Proteins / metabolism
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Dishevelled Proteins
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Embryo, Nonmammalian / metabolism
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Embryonic Induction
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Eye / embryology
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Eye Abnormalities
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In Situ Hybridization
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Microinjections
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Molecular Sequence Data
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Nerve Tissue / abnormalities
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Nerve Tissue / embryology
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Oligonucleotides, Antisense / genetics
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Oligonucleotides, Antisense / metabolism
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Phosphoproteins / genetics
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Phosphoproteins / metabolism*
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Protein Structure, Tertiary
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Proteins / genetics
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Proteins / metabolism*
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Signal Transduction / physiology*
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Trans-Activators*
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Two-Hybrid System Techniques
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Wnt Proteins
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Xenopus Proteins / chemistry
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Xenopus Proteins / genetics
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Xenopus Proteins / metabolism*
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Xenopus laevis / embryology*
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Xenopus laevis / genetics
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Xenopus laevis / metabolism
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Zebrafish Proteins
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beta Catenin
Substances
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Adaptor Proteins, Signal Transducing
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CTNNB1 protein, Xenopus
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Carrier Proteins
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Cytoskeletal Proteins
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DACT1 protein, Xenopus
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DVL1 protein, Xenopus
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Dishevelled Proteins
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Oligonucleotides, Antisense
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Phosphoproteins
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Proteins
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Trans-Activators
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Wnt Proteins
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Xenopus Proteins
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Zebrafish Proteins
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beta Catenin
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wnt8a protein, zebrafish