title: The choice between alternative IIIb and IIIc exons of the FGFR-3 gene is not strictly tissue-specific.
abstract: An essential feature of fibroblast growth factor receptors (FGFR) is the existence of multiple possibilities for alternative splicing. One of these concerns sequences of the mRNA coding for the C-terminal half of Ig domain 3 which corresponds to a part of the ligand-binding site. Two alternative exons, IIIb and IIIc, encode the C-terminal half of Ig domain 3. We show here that the alternative splicing choice between IIIb and IIIc exons of the FGFR-3 is not strictly tissue-specific: epithelial cells show exclusively IIIb transcripts while fibroblastic cells show a mixture of IIIb and IIIc transcripts. This is in contrast with the strictly exclusive alternative choice between IIIb or IIIc exons of the FGFR-2 gene: epithelial cells make only the IIIb choice while fibroblastic cells make only the IIIc choice.
mesh_terms: D017398:Alternative Splicing; D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D002478:Cells, Cultured; D003110:Colonic Neoplasms; D017931:DNA Primers; D004817:Epidermis / Q000378:metabolism; D005091:Exons; D005346:Fibroblast Growth Factors / Q000378:metabolism; D015870:Gene Expression; D006367:HeLa Cells; D006801:Humans; D015603:Keratinocytes / Q000378:metabolism; D008545:Melanoma; D051379:Mice; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D011505:Protein-Tyrosine Kinases; D020794:Receptor Protein-Tyrosine Kinases / Q000096:biosynthesis; D051497:Receptor, Fibroblast Growth Factor, Type 2; D051498:Receptor, Fibroblast Growth Factor, Type 3; D017468:Receptors, Fibroblast Growth Factor / Q000096:biosynthesis* / Q000235:genetics*; D012867:Skin / Q000378:metabolism; D014407:Tumor Cells, Cultured; D001749:Urinary Bladder Neoplasms
chemical_list: D017931:DNA Primers; D017468:Receptors, Fibroblast Growth Factor; D005346:Fibroblast Growth Factors; C496353:FGFR2 protein, human; C496365:FGFR3 protein, human; C496354:Fgfr2 protein, mouse; C496366:Fgfr3 protein, mouse; D011505:Protein-Tyrosine Kinases; D020794:Receptor Protein-Tyrosine Kinases; D051497:Receptor, Fibroblast Growth Factor, Type 2; D051498:Receptor, Fibroblast Growth Factor, Type 3