FGF signaling refines Wnt gradients to regulate patterning of taste papillae

Author:

Prochazkova Michaela12ORCID,Häkkinen Teemu J.3,Prochazka Jan12,Spoutil Frantisek2,Jheon Andrew H.1,Ahn Youngwook4,Krumlauf Robb4,Jernvall Jukka3ORCID,Klein Ophir D.15ORCID

Affiliation:

1. Department of Orofacial Sciences and Program in Craniofacial Biology, University of California San Francisco, San Francisco, CA 94143, USA

2. Institute of Molecular Genetics of the CAS, v. v. i., Czech Centre for Phenogenomics and Laboratory of Transgenic Models of Diseases, Division BIOCEV, Prumyslova 595, Vestec, Czech Republic

3. Developmental Biology Program, Institute of Biotechnology, University of Helsinki, P.O. Box 56, FIN-00014 Helsinki, Finland

4. Stowers Institute for Medical Research, Kansas City, MO 64110, USA

5. Department of Pediatrics and Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94143, USA

Abstract

The patterning of repeated structures is a major theme in developmental biology, and the interrelationship between spacing and size of such structures is an open question. Fungiform papillae are repeated epithelial structures that house taste buds on the anterior tongue. Here, we report that FGF signaling is a critical regulator of fungiform papillae development. We found that mesenchymal FGF10 controls the size of the papillary area, while overall patterning remains unchanged. Our results show that FGF signaling negatively affects the extent of canonical Wnt signaling, which is the main activation pathway during fungiform papillae development, but this effect does not occur at the level of gene transcription. Rather, our experimental data together with computational modeling indicate that FGF10 modulates the range of Wnt effects, likely via induction of Sostdc1 expression. We suggest that modification of the reach of Wnt signaling could be due to local changes in morphogen diffusion, representing a novel mechanism in this tissue context, and we propose that this phenomenon might be involved in a broader array of mammalian developmental processes.

Funder

National Institutes of Health

Publisher

The Company of Biologists

Subject

Developmental Biology,Molecular Biology

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