Institute for Biology and Molecular Genetics
Thomas Schimmang

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FGF signalling

Functions of FGF genes during inner ear development and differentiation

Fgf and Wnt signalling have been shown to be required for formation of the otic placode in vertebrates. Whereas several Fgfs including Fgf3, Fgf8 and Fgf10 have been shown to participate during early placode induction, Wnt signalling is required for specification and maintenance of the otic placode, and dorsal patterning of the otic vesicle. However, the requirement for specific members of the Wnt gene family for otic placode and vesicle formation and their potential interaction with Fgf signalling has been poorly defined. Due to its spatiotemporal expression during placode formation in the hindbrain Wnt8a has been postulated as a potential candidate for its specification. We have examined the role of Wnt8a during formation of the otic placode and vesicle in mouse embryos. Wnt8a expression depends on the presence of Fgf3 indicating a serial regulation between Fgf and Wnt signalling during otic placode induction and specification. Wnt8a by itself however is neither essential for placode specification nor redundantly required together with Fgfs for otic placode and vesicle formation. Interestingly however, Wnt8a and Fgf3 are redundantly required for expression of Fgf15 in the hindbrain indicating additional reciprocal interactions between Fgf and Wnt signalling. Further reduction of Wnt signalling by the inactivation of Wnt1 in a Wnt8a mutant background revealed a redundant requirement for both genes during morphogenesis of the dorsal portion of the otic vesicle.

Recent publications:

  • An FGF3-BMP Signaling Axis Regulates Caudal Neural Tube Closure, Neural Crest Specification and Anterior-Posterior Axis Extension. Anderson MJ, Schimmang T, Lewandoski M.
    PLoS Genet. 2016 May 4;12(5):e1006018. doi: 10.1371/journal.pgen.1006018. eCollection 2016 May.

  • Roles of Wnt8a during formation and patterning of the mouse inner ear. Vendrell V, Vázquez-Echeverría C, López-Hernández I, Alonso BD, Martinez S, Pujades C, Schimmang T.
    Mech Dev. 2013 Feb;130(2-3):160-8. doi: 10.1016/j.mod.2012.09.009. Epub 2012 Oct 4.



 
           
 


Instituto de Biología y Genética Molecular
Universidad de Valladolid - Consejo Superior de Investigaciones Científicas
C/ Sanz y Forés s/n
47003 - Valladolid - SPAIN
Phone: (+34) 983-184-818 Fax: (+34) 983-184-800
schimman@ibgm.uva.es

© Thomas Schimmang and www.cytfusion.com