title: Characterization and tissue expression of acidic fibroblast growth factor binding protein homologue in Drosophila melanogaster.
abstract: We have earlier reported a Drosophila protein, which aligned significantly with the amino acid sequence of the human acidic fibroblast growth factor intracellular binding protein (FIBP). In attempts to further elucidate the function of FIBP and its putative role in fibroblast growth factor (FGF) signaling we have cloned and characterized FIBP from Drosophila melanogaster (DrFIBP). Using comparative sequence analysis of Drosophila and human FIBP genes we demonstrate a remarkable conservation of their structural architecture suggesting that FIBP from vertebrates and insects are genuine homologues. Reverse transcriptase polymerase chain reaction analysis of FIBP mRNA from Drosophila revealed differential splicing by intron retention resulting in the production of three distinct FIBP transcripts. The retention of the intronic sequences introduces termination codons within the mature FIBP mRNA leading to premature termination of translation. Analysis of FIBP mRNA distribution in the fruit fly suggests that DrFIBP, like its mammalian homologue, is an abundant protein whose expression is maintained during embryonic, larval and adult stages. The spatial expression pattern investigated by whole mount embryo immunostaining reveals expression of FIBP in the developing tracheal system and in ventral midline cells, two known sites of FGF signaling in the fruit fly.
authors.affiliation: Department of Biochemistry, Institute for Cancer Research, The Norwegian Radium Hospital, Montebello, N-0310, Oslo, Norway.
authors.forename: Elona
authors.initials: E
authors.lastname: Kolpakova
authors.forename: Tor Erik
authors.initials: TE
authors.lastname: Rusten
authors.forename: Sjur
authors.initials: S
authors.lastname: Olsnes
mesh_terms: D017398:Alternative Splicing; D000818:Animals; D015152:Blotting, Northern; D002352:Carrier Proteins / Q000235:genetics*; D004247:DNA / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D029721:Drosophila Proteins / Q000235:genetics* / Q000378:metabolism; D004331:Drosophila melanogaster / Q000196:embryology / Q000235:genetics* / Q000254:growth & development; D004625:Embryo, Nonmammalian / Q000378:metabolism; D047108:Embryonic Development; D005091:Exons; D018507:Gene Expression Regulation, Developmental; D017344:Genes, Insect / Q000235:genetics; D007150:Immunohistochemistry; D047908:Intracellular Signaling Peptides and Proteins; D007438:Introns; D008969:Molecular Sequence Data; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D017422:Sequence Analysis, DNA
chemical_list: D002352:Carrier Proteins; D018076:DNA, Complementary; D029721:Drosophila Proteins; C476059:FIBP protein, Drosophila; D047908:Intracellular Signaling Peptides and Proteins; D020033:Protein Isoforms; D012333:RNA, Messenger; D004247:DNA