title: CnNK-2, an NK-2 homeobox gene, has a role in patterning the basal end of the axis in hydra.
abstract: NK-2-class homeobox genes have been identified in a variety of metazoans, from sponges to arthropods and vertebrates, and have been shown to play roles in a variety of cell and tissue specifications. Here we describe the characterization of the NK-2 homolog CnNK-2 from Hydra vulgaris, a freshwater cnidarian. CnNK-2 expression is restricted to the endodermal epithelial cells of hydra and is primarily in the peduncle, the lower end of the body column. In some species it is graded along the apical-basal axis with a maximum in the basal tissue of the lower peduncle, adjacent to the foot. CnNK-2 expression invariably precedes foot formation as part of the normal tissue dynamics of the adult as well as during asexual reproduction by budding, foot regeneration, or ectopic foot formation. Manipulations which alter the gradient of positional value along this axis affect CnNK-2 expression in a manner which indicates that expression of this gene is closely linked to the gradient. The normal and altered patterns of expression of this gene extend the understanding of the regulation of foot formation in hydra.
authors.affiliation: Developmental Biology Center, University of California, Irvine, California, 92717, USA. hrbode@uci.ed
authors.forename: A
authors.initials: A
authors.lastname: Grens
authors.forename: L
authors.initials: L
authors.lastname: Gee
authors.forename: D A
authors.initials: DA
authors.lastname: Fisher
authors.forename: H R
authors.initials: HR
authors.lastname: Bode
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D004330:Drosophila; D029721:Drosophila Proteins; D018507:Gene Expression Regulation, Developmental; D005801:Genes, Homeobox; D018398:Homeodomain Proteins / Q000096:biosynthesis* / Q000737:chemistry / Q000235:genetics; D006829:Hydra / Q000235:genetics / Q000502:physiology*; D017403:In Situ Hybridization; D051379:Mice; D008969:Molecular Sequence Data; D051381:Rats; D012038:Regeneration; D017386:Sequence Homology, Amino Acid; D014157:Transcription Factors; D014981:Xenopus
chemical_list: D029721:Drosophila Proteins; D018398:Homeodomain Proteins; D014157:Transcription Factors; C094797:vnd protein, Drosophila