title: Regulation of external genitalia development by concerted actions of FGF ligands and FGF receptors.
abstract: Members of the fibroblast growth factor (FGF) family play diverse roles during the development and patterning of various organs. In human and mice, 22 FGFs and four receptors derived from several splice variants are present. Redundant expression and function of FGF genes in organogenesis have been reported, but their roles in embryonic external genitalia, genital tubercle (GT), development have not been studied in detail. To address the role of FGF during external genitalia development, we have analyzed the expression of FGF genes (Fgf8, 9, 10) and receptor genes (Fgfr1, r2IIIb, r2IIIc) in GT of mice. Furthermore, Fgf10 and Fgfr2IIIb mutant mice were analyzed to elucidate their roles in embryonic external genitalia development. Fgfr2IIIb was expressed in urethral plate epithelium during GT development. Fgfr2IIIb mutant mice display urethral dysmorphogenesis. Marker gene analysis for urethral plate and bilateral mesenchymal formation suggests the existence of epithelial-mesenchymal interaction during urethral morphogenesis. Therefore, FGF10/FGFR2IIIb signals seem to constitute a developmental cascade for such morphogenesis.
authors.affiliation: Center for Animal Resources and Development, Graduate School of Molecular and Genomic Pharmacy, Kumamoto University, 860-0811 Kumamoto, Japan.
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Satoh
authors.forename: Ryuma
authors.initials: R
authors.lastname: Haraguchi
authors.forename: Tracy J
authors.initials: TJ
authors.lastname: Wright
authors.forename: Suzanne L
authors.initials: SL
authors.lastname: Mansour
authors.forename: Juha
authors.initials: J
authors.lastname: Partanen
authors.forename: Mohammad K
authors.initials: MK
authors.lastname: Hajihosseini
authors.forename: Veraragavan P
authors.initials: VP
authors.lastname: Eswarakumar
authors.forename: Peter
authors.initials: P
authors.lastname: Lonai
authors.forename: Gen
authors.initials: G
authors.lastname: Yamada
mesh_terms: D000818:Animals; D005260:Female; D051526:Fibroblast Growth Factor 10; D005346:Fibroblast Growth Factors / Q000235:genetics* / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental; D005819:Genetic Markers; D008024:Ligands; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D008817:Mice, Mutant Strains; D020794:Receptor Protein-Tyrosine Kinases / Q000235:genetics* / Q000378:metabolism; D051497:Receptor, Fibroblast Growth Factor, Type 2; D017468:Receptors, Fibroblast Growth Factor / Q000235:genetics* / Q000378:metabolism; D015398:Signal Transduction; D014521:Urethra / Q000196:embryology* / Q000378:metabolism
chemical_list: C496464:Fgf10 protein, mouse; D051526:Fibroblast Growth Factor 10; D005819:Genetic Markers; D008024:Ligands; D017468:Receptors, Fibroblast Growth Factor; D005346:Fibroblast Growth Factors; C496354:Fgfr2 protein, mouse; D020794:Receptor Protein-Tyrosine Kinases; D051497:Receptor, Fibroblast Growth Factor, Type 2