title: In situ expression of 15 kDa interferon alpha responsive gene in the developing tooth germ of the mouse lower first molar.
abstract: We previously performed cDNA subtraction between the mouse mandibles at embryonic day 10.5 (E10.5) and E12.0 to make a profile of the regulator genes for odontogenesis. Fifteen kDa interferon alpha responsive gene (Ifrg15) is one of several highly-expressed genes in the E12.0 mandible. The current study examined the precise expression patterns of Ifrg15 mRNA in the mouse mandibular first molar by in situ hybridization to evaluate the possible functional roles of this gene in odontogenesis. Ifrg15 mRNA was expressed in the epithelial and mesenchymal tissues of the mandible at E10.5 and E12.0. The Ifrg15 in situ signal was detected in the epithelial bud and the surrounding mesenchyme at E14.0, and was present in the enamel organ including the primary enamel knot, and in the underlying mesenchyme at E15.0. The in situ signal was restricted in the inner and outer enamel epithelia and the stratum intermedium at E16.0. The signal of Ifrg15 mRNA was further restricted to the inner enamel epithelium and the adjacent stratum intermedium at E17.0 and E18.0. Consequently, the expression of Ifrg15 mRNA was localized in the ameloblasts and odontoblasts at postnatal days 1.0 to 3.0. However, the in situ signal was markedly weaker than at the embryonic period. The expression of Ifrg15 mRNA was coincidently observed in various craniofacial organs as well as in the tooth germ. These results suggest that Ifrg15 is closely related to odontogenesis, especially the differentiation of the ameloblasts and odontoblasts, and to the morphogenesis of the craniofacial organs.
authors.affiliation: Laboratory of Oral and Pathology and Medicine, Division of Maxillofacial Diagnostic and Surgical Sciences, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
authors.forename: Merina
authors.initials: M
authors.lastname: Akhter
authors.forename: Ieyoshi
authors.initials: I
authors.lastname: Kobayashi
authors.forename: Tamotsu
authors.initials: T
authors.lastname: Kiyoshima
authors.forename: Kengo
authors.initials: K
authors.lastname: Nagata
authors.forename: Hiroko
authors.initials: H
authors.lastname: Wada
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Ookuma
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Fujiwara
authors.forename: Jyun-Ya
authors.initials: JY
authors.lastname: Honda
authors.forename: Hidetaka
authors.initials: H
authors.lastname: Sakai
mesh_terms: D000818:Animals; D005145:Face; D018507:Gene Expression Regulation, Developmental; D017403:In Situ Hybridization; D016898:Interferon-alpha / Q000235:genetics* / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D008963:Molar / Q000166:cytology / Q000196:embryology* / Q000378:metabolism*; D008970:Molecular Weight; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D014083:Tooth Germ / Q000166:cytology / Q000196:embryology* / Q000378:metabolism*
chemical_list: C554783:Ifrg15 protein, mouse; D016898:Interferon-alpha; D012333:RNA, Messenger