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First published online April 22, 2004
doi: 10.1242/10.1242/dev.01122
1 The Berman-Gund Laboratory for the Study of Retinal Degenerations, Harvard
Medical School, Massachusetts Eye and Ear Infirmary, Boston, MA 02114,
USA
2 Developmental Biology Program, Sloan Kettering Institute, New York, NY 10021,
USA
Author for correspondence (e-mail:
tli{at}meei.harvard.edu)
Accepted 27 January 2004
Sonic hedgehog (SHH) is a secreted morphogen that regulates the patterning and growth of many tissues in the developing mouse embryo, including the central nervous system (CNS). We show that a member of the FK506-binding protein family, FKBP8, is an essential antagonist of SHH signaling in CNS development. Loss of FKBP8 causes ectopic and ligand-independent activation of the Shh pathway, leading to expansion of ventral cell fates in the posterior neural tube and suppression of eye development. Although it is expressed broadly, FKBP8 is required to antagonize SHH signaling primarily in neural tissues, suggesting that hedgehog signal transduction is subject to cell-type specific modulation during mammalian development.
Key words: FKBP8, FKBP38, Sonic hedgehog, Neural tube patterning, Signaling, Mouse
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