title: A Wnt signaling pathway controls hox gene expression and neuroblast migration in C. elegans.
abstract: The specification of body pattern along the anteroposterior (A/P) body axis is achieved largely by the actions of conserved clusters of Hox genes. Limiting expression of these genes to localized regional domains and controlling the precise patterns of expression within those domains is critically important for normal patterning. Here we report that egl-20, a C. elegans gene required to activate expression of the Hox gene mab-5 in the migratory neuroblast QL, encodes a member of the Wnt family of secreted glycoproteins. We have found that a second Wnt pathway gene, bar-1, which encodes a beta-catenin/Armadillo-like protein, is also required for activation of mab-5 expression in QL. In addition, we describe the gene pry-1, which is required to limit expression of the Hox genes lin-39, mab-5 and egl-5 to their correct local domains. We find that egl-20, pry-1 and bar-1 all function in a linear genetic pathway with conserved Wnt signaling components, suggesting that a conserved Wnt pathway activates expression of mab-5 in the migratory neuroblast QL. Moreover, we find that members of this Wnt signaling system play a major role in both the general and fine-scale control of Hox gene expression in other cell types along the A/P axis.
authors.affiliation: Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA 94143-0448, USA.
authors.forename: J N
authors.initials: JN
authors.lastname: Maloof
authors.forename: J
authors.initials: J
authors.lastname: Whangbo
authors.forename: J M
authors.initials: JM
authors.lastname: Harris
authors.forename: G D
authors.initials: GD
authors.lastname: Jongeward
authors.forename: C
authors.initials: C
authors.lastname: Kenyon
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D017173:Caenorhabditis elegans / Q000235:genetics* / Q000378:metabolism; D029742:Caenorhabditis elegans Proteins; D002465:Cell Movement / Q000235:genetics; D003598:Cytoskeletal Proteins / Q000235:genetics / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental; D006023:Glycoproteins / Q000235:genetics* / Q000378:metabolism*; D015801:Helminth Proteins / Q000235:genetics* / Q000378:metabolism*; D018398:Homeodomain Proteins / Q000235:genetics* / Q000378:metabolism*; D008969:Molecular Sequence Data; D009154:Mutation; D009474:Neurons / Q000166:cytology / Q000502:physiology*; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D051153:Wnt Proteins
chemical_list: D029742:Caenorhabditis elegans Proteins; D003598:Cytoskeletal Proteins; C117259:Egl-20 protein, C elegans; D006023:Glycoproteins; D015801:Helminth Proteins; D018398:Homeodomain Proteins; C081538:Mab-5 protein, C elegans; C117260:Pry-1 protein, C elegans; D014157:Transcription Factors; D051153:Wnt Proteins; C115014:bar-1 protein, C elegans; C108673:lin-39 protein, C elegans