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Development, Vol 126, Issue 2 221-228, Copyright © 1999 by Company of Biologists
JOURNAL ARTICLES |
AS Tucker, A Al Khamis, CA Ferguson, I Bach, MG Rosenfeld and PT Sharpe
Department of Craniofacial Development, GKT Dental Institute, Kings College, Guy's Hospital, London SE1 9RT, UK.
Clim-2 (NLI, Lbd1) is one of two related mouse proteins that interact with Lim-domain homeoproteins. In the mouse, embryonic expression of Clim-2 is particularly pronounced in facial ectomesenchyme and limb bud mesenchyme in association with Lim genes, Lhx-6 and Lmx-1 respectively. We show that in common with both these Lim genes, Clim-2 expression is regulated by signals from overlying epithelium. In both the developing face and the limb buds we identify Fgf-8 as the likely candidate signalling molecule that regulates Clim-2 expression. We show that in the mandibular arch, as in the limb, Fgf-8 functions in combination with CD44, a cell surface binding protein, and that blocking CD44 binding results in inhibition of Fgf8-induced expression of Clim-2 and Lhx-6. Regulation of gene expression by Fgf8 in association with CD44 is thus conserved between limb and mandibular arch development.
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