title: Caenorhabditis elegans DAF-21 (HSP90) is characteristically and predominantly expressed in germline cells: spatial and temporal analysis.
abstract: Three monoclonal antibodies against antigens that exist in the Caenorhabditis elegans germ line have previously been described. In the present study, a full-length mRNA for one of these antigens was isolated, and by sequencing its corresponding cDNA, it was predicted that the protein would show a high homology with the 90 kDa heat shock protein (HSP90) in other species, and with the protein of daf-21, a previously identified hsp90 homologue. The spatial and temporal distribution of the antigen (DAF-21) was analyzed in C. elegans, and the localization of daf-21 mRNA, as detected by in situ hybridization, agreed with that detected by the monoclonal antibody. Under normal conditions, daf-21 mRNA is characteristically distributed in postembryonic germ cells derived from Z2 and Z3 cells in both hermaphrodites and males. Under heat stress conditions, however, daf-21 mRNA was not only detected in germ cells, but also apparently expressed all over the body. In addition, the DAF-21 protein seemed to be localized in the perinuclear region of somatic cells.
authors.affiliation: Department of Biotechnology, Fukuyama University, Fukuyama 729-0292, Japan.
authors.forename: Tadao
authors.initials: T
authors.lastname: Inoue
authors.forename: Katsumi
authors.initials: K
authors.lastname: Takamura
authors.forename: Hisanori
authors.initials: H
authors.lastname: Yamae
authors.forename: Naoto
authors.initials: N
authors.lastname: Ise
authors.forename: Manabu
authors.initials: M
authors.lastname: Kawakami
authors.forename: Yo
authors.initials: Y
authors.lastname: Tabuse
authors.forename: Johji
authors.initials: J
authors.lastname: Miwa
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Yamaguchi
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D017173:Caenorhabditis elegans / Q000235:genetics / Q000378:metabolism*; D005260:Female; D005854:Germ Cells / Q000378:metabolism*; D018841:HSP90 Heat-Shock Proteins / Q000096:biosynthesis / Q000235:genetics*; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D008297:Male; D008969:Molecular Sequence Data; D009928:Organ Specificity / Q000502:physiology
chemical_list: D018841:HSP90 Heat-Shock Proteins