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Dev Biol 2015 Jan 01;3971:129-39. doi: 10.1016/j.ydbio.2014.10.019.
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Xenopus laevis FGF receptor substrate 3 (XFrs3) is important for eye development and mediates Pax6 expression in lens placode through its Shp2-binding sites.

Kim YJ , Bahn M , Kim YH , Shin JY , Cheong SW , Ju BG , Kim WS , Yeo CY .

Members of the fibroblast growth factor (FGF) family play important roles during various developmental processes including eye development. FRS (FGF receptor substrate) proteins bind to FGFR and serve as adapters for coordinated assembly of multi-protein complexes involved in Ras/MAPK and PI3 kinase/Akt pathways. Here, we identified Xenopus laevis Frs3 (XFrs3), a homolog of vertebrate Frs3, and investigated its roles during embryogenesis. XFrs3 is expressed maternally and zygotically with specific expression patterns throughout the early development. Knockdown of XFrs3 using a specific antisense morpholino oligonucleotide (MO) caused reduction of Pax6 expression in the lens placode, and defects in the eye ranging from microphthalmia to anophthalmia. XFrs3 MO-induced defects were alleviated by wild type XFrs3 or a mutant XFrs3 (XFrs3-4YF), in which the putative tyrosine phosphorylation sites served as Grb2-binding sites are mutated. However, another XFrs3 mutant (XFrs3-2YF), in which the putative Shp2-binding sites are mutated, could not rescue the defects of XFrs3 morphants. In addition, we found that XFrs3 is important for FGF or IGF-induced ERK activation in ectodermal tissue. Taken together, our results suggest that signaling through Shp2-binding sites of XFrs3 is necessary for the eye development in Xenopus laevis.

PubMed ID: 25446028
Article link: Dev Biol

Species referenced: Xenopus laevis
Genes referenced: cdx4 eef1a1 egr2 en2 evx1 fgf2 fgf4 fgf8 fgfr1 foxg1 frs2 frs3 grb2 gsc igf1 mapk1 myc odc1 otx2 pax6 pitx3 ptbp1 ptpn11 rax rax2 sox3 sox7 tbxt vegt ventx1 ventx1.2
Antibodies: Actb Ab2 Akt1 Ab1 Akt1 Ab6 FLAG Ab1 MapK1 Ab5 Mapk1 Ab3
Morpholinos: frs3 MO1

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