title: Mouse naked cuticle 2 (mNkd2) as a direct transcriptional target of Hoxc8 in vivo.
abstract: Mouse naked cuticle 2 (mNkd2), the mammalian homolog of the Drosophila segment polarity gene naked cuticle (nkd), encodes an EF hand protein that regulates early Wg activity by acting as an inducible antagonist. The transcription factor, Hoxc8, a member of the homeobox gene family, is vital for growth and differentiation. Chromatin immunoprecipitation (ChIP) assay, an electrophoretic mobility shift assay (EMSA), and a reporter assay demonstrated that endogenous Hoxc8 protein binds directly to the enhancer region of the mNkd2 gene, implying a Hoxc8-dependent transcriptional activity. Introduction of exogenous Hoxc8 into NIH3T3 cell lines lacking wild-type Hoxc8 dramatically reduced expression of mNkd2 mRNA. If, as the results suggest, mNkd2 is a direct target of Hoxc8, it represents a novel mechanism by which Hoxc8 might cross-talk with the Wnt signaling pathway by regulating mNkd2.
authors.affiliation: Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut 06511, USA.
authors.forename: Haiyan
authors.initials: H
authors.lastname: Lei
authors.forename: Aster H
authors.initials: AH
authors.lastname: Juan
authors.forename: Moo-Sang
authors.initials: MS
authors.lastname: Kim
authors.forename: Frank H
authors.initials: FH
authors.lastname: Ruddle
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D002135:Calcium-Binding Proteins; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D047369:Chromatin Immunoprecipitation; D024202:Electrophoretic Mobility Shift Assay; D004622:Embryo, Mammalian / Q000166:cytology; D005786:Gene Expression Regulation; D018398:Homeodomain Proteins / Q000378:metabolism*; D008156:Luciferases; D051379:Mice; D041681:NIH 3T3 Cells; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D002135:Calcium-Binding Proteins; D002352:Carrier Proteins; D018398:Homeodomain Proteins; C489816:Hoxc8 protein, mouse; C521558:Nkd2 protein, mouse; D008156:Luciferases