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Disc1 regulates both ?-catenin-mediated and noncanonical Wnt signaling during vertebrate embryogenesis.


ABSTRACT: Disc1 is a schizophrenia risk gene that engages multiple signaling pathways during neurogenesis and brain development. Using the zebrafish as a tool, we analyze the function of zebrafish Disc1 (zDisc1) at the earliest stages of brain and body development. We define a "tool" as a biological system that gives insight into mechanisms underlying a human disorder, although the system does not phenocopy the disorder. A zDisc1 peptide binds to GSK3?, and zDisc1 directs early brain development and neurogenesis, by promoting ?-catenin-mediated Wnt signaling and inhibiting GSK3? activity. zDisc1 loss-of-function embryos additionally display a convergence and extension phenotype, demonstrated by abnormal movement of dorsolateral cells during gastrulation, through changes in gene expression, and later through formation of abnormal, U-shaped muscle segments, and a truncated tail. These phenotypes are caused by alterations in the noncanonical Wnt pathway, via Daam and Rho signaling. The convergence and extension phenotype can be rescued by a dominant negative GSK3? construct, suggesting that zDisc1 inhibits GSK3? activity during noncanonical Wnt signaling. This is the first demonstration that Disc1 modulates the noncanonical Wnt pathway and suggests a previously unconsidered mechanism by which Disc1 may contribute to the etiology of neuropsychiatric disorders.

SUBMITTER: De Rienzo G 

PROVIDER: S-EPMC3236629 | biostudies-other | 2011 Dec

REPOSITORIES: biostudies-other

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Disc1 regulates both β-catenin-mediated and noncanonical Wnt signaling during vertebrate embryogenesis.

De Rienzo Gianluca G   Bishop Joshua A JA   Mao Yingwei Y   Pan Luyuan L   Ma Taylur P TP   Moens Cecilia B CB   Tsai Li-Huei LH   Sive Hazel H  

FASEB journal : official publication of the Federation of American Societies for Experimental Biology 20110822 12


Disc1 is a schizophrenia risk gene that engages multiple signaling pathways during neurogenesis and brain development. Using the zebrafish as a tool, we analyze the function of zebrafish Disc1 (zDisc1) at the earliest stages of brain and body development. We define a "tool" as a biological system that gives insight into mechanisms underlying a human disorder, although the system does not phenocopy the disorder. A zDisc1 peptide binds to GSK3β, and zDisc1 directs early brain development and neuro  ...[more]

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