title: Characterization of fibroblast growth factor receptor 1 RNA expression in the embryonic mouse heart.
abstract: We used reverse transcriptase-polymerase chain reaction (RT-PCR) to clone fibroblast growth factor receptor (FGFR) 1 isoforms from embryonic mouse heart and as a more sensitive method to characterize FGFR1 RNA expression in embryonic and adult mouse hearts. We describe the cloning of both full-length short (2259 base pairs) and long (2526 base pairs) FGFR1 isoform cDNAs which generated 86 and 102 kilodalton proteins, respectively, following in vitro translation. An assessment of FGFR1 RNA indicates that FGFR1-IIIc is the major form in both the embryonic and adult heart but there is an approximately 8.5-fold decrease in RNA levels in the adult. Differential RNA blotting as well as RT-PCR analyses are consistent with a switch in the relative expression of the short versus long FGFR1 isoforms during heart development. The long isoforms are more abundant in the embryo and the short isoforms predominate in the adult. This may be important in the regulation of growth and development of the heart.
authors.affiliation: Department of Physiology, University of Manitoba, Winnipeg, Canada.
authors.forename: K B
authors.initials: KB
authors.lastname: Pasumarthi
authors.forename: Y
authors.initials: Y
authors.lastname: Jin
authors.forename: M E
authors.initials: ME
authors.lastname: Bock
authors.forename: A
authors.initials: A
authors.lastname: Lytras
authors.forename: E
authors.initials: E
authors.lastname: Kardami
authors.forename: P A
authors.initials: PA
authors.lastname: Cattini
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001921:Brain / Q000378:metabolism; D003001:Cloning, Molecular; D016384:Consensus Sequence; D017931:DNA Primers; D004622:Embryo, Mammalian; D005091:Exons; D016222:Fibroblast Growth Factor 2 / Q000378:metabolism / Q000502:physiology; D015870:Gene Expression; D006321:Heart / Q000196:embryology; D051379:Mice; D008969:Molecular Sequence Data; D009206:Myocardium / Q000378:metabolism*; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000032:analysis / Q000096:biosynthesis; D020794:Receptor Protein-Tyrosine Kinases; D051496:Receptor, Fibroblast Growth Factor, Type 1; D017468:Receptors, Fibroblast Growth Factor / Q000096:biosynthesis*; D015183:Restriction Mapping; D017386:Sequence Homology, Amino Acid
chemical_list: D017931:DNA Primers; D012333:RNA, Messenger; D017468:Receptors, Fibroblast Growth Factor; D016222:Fibroblast Growth Factor 2; C496349:Fgfr1 protein, mouse; D020794:Receptor Protein-Tyrosine Kinases; D051496:Receptor, Fibroblast Growth Factor, Type 1