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Regulation of external genitalia development by concerted actions of FGF ligands and FGF receptors

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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.

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Acknowledgements

We would like to thank Drs. John K. Heath, Clive Dickson, Tsutomu Ogata, Shigeaki Kato, Janet Rossant, Chi-Chung Hui, Yiping Chen, Gail Martin, Cheng-Ming Chuong, Brigid Hogan, Uli Ruether, Karen M. Lyons, Elaine Fuchs, Nobuyuki Itoh, Anne M. Moon, and David Ornitz for reagents and/or suggestions, and Takashi Tanaharu, Ryu Gejima, Daisuke Sasagawa, and Shiho Kitagawa for assistance. This research was supported by a Grant-in-Aid for Scientific Research on Priority Areas (1), General Promotion of Cancer Research in Japan, Mechanisms of Sex Differentiation, and by the 21st Century COE Research Program and Child Health and Development (14C-1) from the Ministry of Health, Labour and Welfare.

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Correspondence to Gen Yamada.

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Y. Satoh and R. Haraguchi contributed equally to this work

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Satoh, Y., Haraguchi, R., Wright, T.J. et al. Regulation of external genitalia development by concerted actions of FGF ligands and FGF receptors. Anat Embryol 208, 479–486 (2004). https://doi.org/10.1007/s00429-004-0419-9

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