title: Molecular cloning and expression pattern of the Fkbp25 gene during cerebral cortical neurogenesis.
abstract: Neocortical neurons are generated predominantly from the cells that proliferate in the ventricular zone of the telencephalon. In order to understand the nature of these expanding cortical neuronal progenitor cells, we selected by differential display some transcripts that were enriched in the telencephalon as compared to the more caudal regions (diencephalon/mesencephalon). This systematic screening revealed one of the differentially expressed transcripts, namely the Fkbp25 mRNA that encodes a member of the FK506 binding proteins (FKBPs). Northern blot analysis showed that the expression of the single 1.4kb Fkbp25 transcript reached a maximum level on embryonic day 11.5 at the start of cortical neurogenesis in the mouse and was followed by a weak basal expression in the adult brain. In the embryo, Fkbp25 gene was strongly expressed in the telencephalon ventricular zone but also in areas active in myogenesis (walls of the ventricle and the atrium) and chondrogenesis (the cartilage of the rib and the hindlimb). An increase in the transcript levels of the Fkbp25 gene was also observed during the two successive proliferation waves of the cerebellum development. Immunostaining on primary cultures of embryonic day 10.5 telencephalon stem cells showed that the Fkbp25 protein was present in the cytoplasm and nuclei of cells cultured for 6h but exclusively in the nuclei of the Tuj-1 immunoreactive neurons obtained after 3 days of culture (The sequence data reported here have been submitted to GenBank under accession no. AF135595.).
authors.affiliation: Neurogénétique INSERM E9935, Hôpital Robert Debré, Paris, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Mas
authors.forename: Ismahane
authors.initials: I
authors.lastname: Guimiot-Maloum
authors.forename: Fabien
authors.initials: F
authors.lastname: Guimiot
authors.forename: Malik
authors.initials: M
authors.lastname: Khelfaoui
authors.forename: Virginie
authors.initials: V
authors.lastname: Nepote
authors.forename: Francine
authors.initials: F
authors.lastname: Bourgeois
authors.forename: Bernadett
authors.initials: B
authors.lastname: Boda
authors.forename: Béatrice
authors.initials: B
authors.lastname: Levacher
authors.forename: Andrzej
authors.initials: A
authors.lastname: Galat
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Moalic
authors.forename: Michel
authors.initials: M
authors.lastname: Simonneau
mesh_terms: D000818:Animals; D015152:Blotting, Northern; D015153:Blotting, Western; D001921:Brain / Q000378:metabolism; D019556:COS Cells; D002467:Cell Nucleus / Q000378:metabolism; D049109:Cell Proliferation; D002540:Cerebral Cortex / Q000196:embryology*; D003001:Cloning, Molecular; D003593:Cytoplasm / Q000378:metabolism; D018076:DNA, Complementary / Q000378:metabolism; D004622:Embryo, Mammalian / Q000378:metabolism; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D051379:Mice; D008969:Molecular Sequence Data; D009206:Myocardium / Q000378:metabolism; D009474:Neurons / Q000378:metabolism; D009693:Nucleic Acid Hybridization; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013234:Stem Cells / Q000378:metabolism; D022021:Tacrolimus Binding Proteins / Q000096:biosynthesis* / Q000737:chemistry / Q000235:genetics*; D013687:Telencephalon / Q000378:metabolism; D013997:Time Factors; D014162:Transfection
chemical_list: D018076:DNA, Complementary; D012333:RNA, Messenger; C074856:FKBP3 protein, human; D022021:Tacrolimus Binding Proteins