title: Spatial and temporal expression pattern of a novel gene in the frog Xenopus laevis: correlations with adult intestinal epithelial differentiation during metamorphosis.
abstract: We report the cloning of a novel gene (ID14) and its expression pattern in tadpoles and adults of Xenopus laevis. ID14 encodes a 315-amino acid protein that has a signal peptide and a nidogen domain. Even though several genes have a nidogen domain, ID14 is not the homolog of any known gene. ID14 is a late thyroid hormone (TH)-regulated gene in the tadpole intestine, and its expression in the intestine does not begin until the climax of metamorphosis, correlating with adult intestinal epithelial differentiation. In contrast, ID14 is expressed in tadpole skin and tail and is not regulated by TH. In situ hybridization revealed that this putative extracellular matrix protein is expressed in the epithelia of the tadpole skin and tail and in the intestinal epithelium after metamorphosis. In the adult, ID14 is found predominantly in the intestine with weak expression in the stomach, lung, and testis. Its exclusive expression in the adult intestinal epithelial cells makes it a useful marker for developmental studies and may give insights into cell/cell interactions in intestinal metamorphosis and adult intestinal stem cell maintenance.
authors.affiliation: Section on Molecular Morphogenesis, Laboratory of Gene Regulation and Development, National Institute of Child Health and Human Development, National Institutes of Health, Bldg. 18T, Rm. 106, Bethesda, MD 20892, USA.
authors.forename: Daniel R
authors.initials: DR
authors.lastname: Buchholz
authors.forename: Atsuko
authors.initials: A
authors.lastname: Ishizuya-Oka
authors.forename: Yun-Bo
authors.initials: YB
authors.lastname: Shi
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002454:Cell Differentiation; D016326:Extracellular Matrix Proteins / Q000235:genetics; D018507:Gene Expression Regulation, Developmental; D017403:In Situ Hybridization; D007413:Intestinal Mucosa / Q000166:cytology / Q000254:growth & development*; D007814:Larva / Q000166:cytology / Q000378:metabolism; D008562:Membrane Glycoproteins / Q000235:genetics; D008675:Metamorphosis, Biological; D008969:Molecular Sequence Data; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D029867:Xenopus Proteins / Q000235:genetics* / Q000378:metabolism; D014982:Xenopus laevis / Q000254:growth & development*
chemical_list: D016326:Extracellular Matrix Proteins; D008562:Membrane Glycoproteins; D029867:Xenopus Proteins; C493007:tecta.2 protein, Xenopus