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First published online 27 May 2009
doi: 10.1242/dev.030544

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Follistatin modulates a BMP autoregulatory loop to control the size and patterning of sensory domains in the developing tongue

Crestina L. Beites^1,*,, Piper L. W. Hollenbeck^1,*, Joon Kim^1,*,, Robin Lovell-Badge², Arthur D. Lander³ and Anne L. Calof^1,

¹ Department of Anatomy and Neurobiology and Center for Complex Biological Systems, University of California, Irvine, CA 92697, USA.
² Division of Stem Cell Biology and Developmental Genetics, Medical Research Council, National Institute of Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK.
³ Department of Developmental and Cell Biology and Center for Complex Biological Systems, University of California, Irvine, CA 92697, USA.

Author for correspondence (e-mail: alcalof{at}uci.edu)

Accepted 21 April 2009

The regenerative capacity of many placode-derived epithelial structures makes them of interest for understanding the molecular control of epithelial stem cells and their niches. Here, we investigate the interaction between the developing epithelium and its surrounding mesenchyme in one such system, the taste papillae and sensory taste buds of the mouse tongue. We identify follistatin (FST) as a mesenchymal factor that controls size, patterning and gustatory cell differentiation in developing taste papillae. FST limits expansion and differentiation of Sox2-expressing taste progenitor cells and negatively regulates the development of taste papillae in the lingual epithelium: in Fst^-/- tongue, there is both ectopic development of Sox2-expressing taste progenitors and accelerated differentiation of gustatory cells. Loss of Fst leads to elevated activity and increased expression of epithelial Bmp7; the latter effect is consistent with BMP7 positive autoregulation, a phenomenon we demonstrate directly. We show that FST and BMP7 influence the activity and expression of other signaling systems that play important roles in the development of taste papillae and taste buds. In addition, using computational modeling, we show how aberrations in taste papillae patterning in Fst^-/- mice could result from disruption of an FST-BMP7 regulatory circuit that normally suppresses noise in a process based on diffusion-driven instability. Because inactivation of Bmp7 rescues many of the defects observed in Fst^-/- tongue, we conclude that interactions between mesenchyme-derived FST and epithelial BMP7 play a central role in the morphogenesis, innervation and maintenance of taste buds and their stem/progenitor cells.

Key words: Mouse, Placode, Taste bud, Taste papilla, Mesenchyme, Stem cell, Progenitor cell, TGF-beta, SHH, Wnt, SOX2, FOXA2

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