title: The HOX-like gene Cnox2-Pc is expressed at the anterior region in all life cycle stages of the jellyfish Podocoryne carnea.
abstract: The marine jellyfish Podocoryne carnea (Cnidaria, Hydrozoa) has a metagenic life cycle consisting of a larva, a colonial polyp and a free-swimming jellyfish (medusa). To study the function of HOX genes in primitive diploblastic animals we screened a library of P. carnea cDNA using PCR primers derived from the most conserved regions in helix 1 and helix 3 of the homeobox. A novel gene, Cnox2-Pc, has been isolated and characterized. Cnox2-Pc is a HOX cluster-like gene, and its homeodomain shows similarity to the Deformed subfamily of HOM-C/HOX genes. In situ hybridization revealed that Cnox2-Pc is expressed in the anterior region of the larva, the polyp head, and the most apical ectoderm of the differentiating bud during medusa development. In adult medusa expression is restricted to the gastrovascular entoderm. The results suggest that Cnox2-Pc is involved in establishment of an anterior-posterior axis during development in primitive metazoans.
authors.affiliation: Institute of Zoology, University of Basel, Rheinsprung 9, 4051 Basel, Switzerland.
authors.forename: L M
authors.initials: LM
authors.lastname: Masuda-Nakagawa
authors.forename: H
authors.initials: H
authors.lastname: Gröer
authors.forename: B L
authors.initials: BL
authors.lastname: Aerne
authors.forename: V
authors.initials: V
authors.lastname: Schmid
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D018507:Gene Expression Regulation, Developmental; D018398:Homeodomain Proteins / Q000737:chemistry / Q000235:genetics*; D008969:Molecular Sequence Data; D005810:Multigene Family; D015800:Protozoan Proteins; D037401:Scyphozoa / Q000254:growth & development*; D017386:Sequence Homology, Amino Acid
chemical_list: C118123:Cnox-2 protein, Hydractinia symbiolongicarpu; D018398:Homeodomain Proteins; D015800:Protozoan Proteins