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Characterization and tissue expression of acidic fibroblast growth factor binding protein homologue in Drosophila melanogaster

, : Characterization and tissue expression of acidic fibroblast growth factor binding protein homologue in Drosophila melanogaster. Gene (Amsterdam) 310: 185-191, 22 May

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 FLBP 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.


PMID: 12801646

DOI: 10.1016/s0378-1119(03)00550-x

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